I would like to have ages of the following metalavas:

1. Age of the Kaivoniitty Member in Pyöreasuo Formation in Honkajärvi Group ?

2. Age of the Nurmela Formation in Honkajärvi Group ?

3. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

4. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

5. Age of the Matinvaara Formation in Kurkikylä Group ?

(There is one old and very inaccurtate age determination
of the Matinvaara Fromation, 2271 +- 93 Ma, mentioned in Laajoki, K. 1991, (about geology of kainuu Schist Belt), if I rememeber right
and one very uncertain more recent age determination, 2400 Ma +- ? Ma.

This +- ? could mean even +- 100 Ma inaccuracy, in Huhma H. et al. 2018. (Monograph), Geol. Soc. Surv. of Finland, Bul. 405.)

This Matinvaara Formation (metalava) above and below of which there exist diamictites (dropstones, glacial time marks) is important to have its
accurate age.

Best Regards,

Hannu Porpudas

(amateur geologist)

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Monday, June 25, 2018 at 9:40:10 AM UTC+3, Hannu Poropudas wrote:

I would like to have ages of the following metalavas:

1. Age of the Kaivoniitty Member in Pyöreasuo Formation in Honkajärvi Group ?

2. Age of the Nurmela Formation in Honkajärvi Group ?

3. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

4. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

CORRECTION:

4. Age of the Vihantaselänsuo Mb in Vihantaselkä Fm in Kurkikylä Group ?

5. Age of the Matinvaara Formation in Kurkikylä Group ?

(There is one old and very inaccurtate age determination
of the Matinvaara Fromation, 2271 +- 93 Ma, mentioned in Laajoki, K. 1991, (about geology of kainuu Schist Belt), if I rememeber right
and one very uncertain more recent age determination, 2400 Ma +- ? Ma.

This +- ? could mean even +- 100 Ma inaccuracy, in Huhma H. et al. 2018. (Monograph), Geol. Soc. Surv. of Finland, Bul. 405.)

This Matinvaara Formation (metalava) above and below of which there exist diamictites (dropstones, glacial time marks) is important to have its accurate age.

Best Regards,

Hannu Porpudas

(amateur geologist)

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Tuesday, March 5, 2019 at 12:15:56 PM UTC+2, Hannu Poropudas wrote:

On Monday, June 25, 2018 at 9:40:10 AM UTC+3, Hannu Poropudas wrote:

I would like to have ages of the following metalavas:

1. Age of the Kaivoniitty Member in Pyöreasuo Formation in Honkajärvi Group ?

2. Age of the Nurmela Formation in Honkajärvi Group ?

3. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

4. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

CORRECTION:

4. Age of the Vihantaselänsuo Mb in Vihantaselkä Fm in Kurkikylä Group ?

5. Age of the Matinvaara Formation in Kurkikylä Group ?

(There is one old and very inaccurtate age determination
of the Matinvaara Fromation, 2271 +- 93 Ma, mentioned in Laajoki, K. 1991, (about geology of kainuu Schist Belt), if I rememeber right
and one very uncertain more recent age determination, 2400 Ma +- ? Ma.

This +- ? could mean even +- 100 Ma inaccuracy, in Huhma H. et al. 2018. (Monograph), Geol. Soc. Surv. of Finland, Bul. 405.)

This Matinvaara Formation (metalava) above and below of which there exist diamictites (dropstones, glacial time marks) is important to have its accurate age.

Best Regards,

Hannu Porpudas

(amateur geologist)

ONE IMPORTANT REGOLITH !!!:

Age of the Hetehongikko Member in Laanhongikko Formation in Kurkikylä Group ? This Member contains regolith which possible could be dated ?
Type section: Map 353308 B, x = 7237.39, y= 560.43, to the north (350 degrees). (Paper II, page 69 / Table 1, pages 70-74. in the reference (1.)).

References (1-4):
1. Strand, K. 1993.
Sedimentation in a Paleoproterozoic (Karelian) Rift to Cratonic Margin Transition, Finland.
(Dissertation).
Acta Universitatis Ouluensis Series A Scientiae Rerum Naturalium 242. University of Oulu. Printing Center Oulu 1993. (ISBN 951-42-3506-1).
(Pages 1-9 & 11-35, and Papers I-IV).
( Paper I
Strand, K. 1988.
Alluvial Sedimentation and Tectonic Setting of the Early Proterozoic Kurkikylä and
Kainuu Groups in Northern Finland.
In:
Laajoki, K. and Paakkola (Editors), 1988
Sedimentology of the Precambrian Formations in Eastern and Northern Finland 1986.
Geological Survey of Finland. Spec. Paper 5: 75-90, 1988.
Paper II
Laajoki, K. Strand, K. and Härmä, P. 1989.
Lithostratigraphy of the Early Proterozoic Kainuu Schist Belt the Kurkikylä-Siikavaara Area,
Northern Finland, with Emphasis on the Genetic Approach.
Bull. Geol. Soc. Finland 61: 65-93 (1989). (Pages 65-93).
Paper III
Strand, K.O. and Laajoki, K. 1993.
Paleoprpoterozoic Glaciomarine Sedimentation in an Extensional tectonic Setting:
the Honkala Formation, Finland. (Pages 1-30), (in press).
Precambrian Research, 64 (1993) 253-271.
Paper IV
Strand, K.O. 1993.
Allocyclic Coastline Movements on the Paleoproterozoic (Rhyacian) Cratonic Margin:
the East Puolanka Group, Finland. (Pages 1-47), (submitted for publication). )

2. Sturt B. A. Melezhik V. A. and Ramsay D. M. 1994.
Early Proterozoic Regolith at Pasvik, NE Norway: Palaeoenvironmental Implications for the Baltic Shield.
Terra Nova, 6, 618-633, 1994. (Page 627, Table 3. The 2.35 Gyr-old Regolith of the Baltic Shield,
Page 630, Fig. 10).

3. Laajoki, K. 1998.
Karjalaiset Liuskealueet- mantereen ikivanha pintalkivipeite.
In:
Lehtinen, M. Nurmi, P. Rämö, T. 1998.
3000 vuosimiljoonaa. Suomen Kallioperä.
Suomen Geologinen Seura, Gummerus Kirjapaino Oy, Jyväskylä 1998. 375 sivua. (Pages 165-197, Pages 189-190 and Taulukko 6.1 on page 189, Kuva 6.4 Kainuun liuskealueen pintakivien rakenteita, A, B and C color photographs on pages 173-175).

4. Laajoki, K. 1991.
Stratigraphy of the Northern End of the Early Proterozoic (Karelian) Kainuu Schist Belt,
and Associated Gneiss Complexes Finland.
Geological Survey of Finland, Bulletin 358.
Geologinen Tutkimuskeskus Espoo, 1991. (with 55 figures, 4 tables and 5 appendices).
(Pages 24-25 and Table 3. Pages 26-30 and Fig. 10 on page 28. Pages 96-97.) (Appendix 1. Map1 (important color bedrock map),
Appendix 2 (important color crossections map),
Appendix 3. Map2 (aeromagnetic map),
Appendix 4. Map 3 (ground-magnetic map),
Appendix 5. Map 4 (gravity map).)

Best Regards,

Hannu Poropudas

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

On Thursday, June 27, 2019 at 12:05:22 PM UTC+3, Hannu Poropudas wrote:

On Tuesday, March 5, 2019 at 12:15:56 PM UTC+2, Hannu Poropudas wrote:

On Monday, June 25, 2018 at 9:40:10 AM UTC+3, Hannu Poropudas wrote:

I would like to have ages of the following metalavas:

1. Age of the Kaivoniitty Member in Pyöreasuo Formation in Honkajärvi Group ?

2. Age of the Nurmela Formation in Honkajärvi Group ?

3. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

4. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

CORRECTION:

4. Age of the Vihantaselänsuo Mb in Vihantaselkä Fm in Kurkikylä Group ?

5. Age of the Matinvaara Formation in Kurkikylä Group ?

(There is one old and very inaccurtate age determination
of the Matinvaara Fromation, 2271 +- 93 Ma, mentioned in Laajoki, K. 1991, (about geology of kainuu Schist Belt), if I rememeber right
and one very uncertain more recent age determination, 2400 Ma +- ? Ma.

This +- ? could mean even +- 100 Ma inaccuracy, in Huhma H. et al. 2018. (Monograph), Geol. Soc. Surv. of Finland, Bul. 405.)

This Matinvaara Formation (metalava) above and below of which there exist diamictites (dropstones, glacial time marks) is important to have its accurate age.

Best Regards,

Hannu Porpudas

(amateur geologist)

ONE IMPORTANT REGOLITH !!!:

Age of the Hetehongikko Member in Laanhongikko Formation in Kurkikylä Group ?
This Member contains regolith which possible could be dated ?
Type section: Map 353308 B, x = 7237.39, y= 560.43, to the north (350 degrees).
(Paper II, page 69 / Table 1, pages 70-74. in the reference (1.)).

References (1-4):
1. Strand, K. 1993.
Sedimentation in a Paleoproterozoic (Karelian) Rift to Cratonic Margin Transition, Finland.
(Dissertation).
Acta Universitatis Ouluensis Series A Scientiae Rerum Naturalium 242. University of Oulu. Printing Center Oulu 1993. (ISBN 951-42-3506-1).
(Pages 1-9 & 11-35, and Papers I-IV).
( Paper I
Strand, K. 1988.
Alluvial Sedimentation and Tectonic Setting of the Early Proterozoic Kurkikylä and
Kainuu Groups in Northern Finland.
In:
Laajoki, K. and Paakkola (Editors), 1988
Sedimentology of the Precambrian Formations in Eastern and Northern Finland 1986.
Geological Survey of Finland. Spec. Paper 5: 75-90, 1988.
Paper II
Laajoki, K. Strand, K. and Härmä, P. 1989.
Lithostratigraphy of the Early Proterozoic Kainuu Schist Belt the Kurkikylä-Siikavaara Area,
Northern Finland, with Emphasis on the Genetic Approach.
Bull. Geol. Soc. Finland 61: 65-93 (1989). (Pages 65-93).
Paper III
Strand, K.O. and Laajoki, K. 1993.
Paleoprpoterozoic Glaciomarine Sedimentation in an Extensional tectonic Setting:
the Honkala Formation, Finland. (Pages 1-30), (in press).
Precambrian Research, 64 (1993) 253-271.
Paper IV
Strand, K.O. 1993.
Allocyclic Coastline Movements on the Paleoproterozoic (Rhyacian) Cratonic Margin:
the East Puolanka Group, Finland. (Pages 1-47), (submitted for publication). )

2. Sturt B. A. Melezhik V. A. and Ramsay D. M. 1994.
Early Proterozoic Regolith at Pasvik, NE Norway: Palaeoenvironmental Implications for the Baltic Shield.
Terra Nova, 6, 618-633, 1994. (Page 627, Table 3. The 2.35 Gyr-old Regolith of the Baltic Shield,
Page 630, Fig. 10).

3. Laajoki, K. 1998.
Karjalaiset Liuskealueet- mantereen ikivanha pintalkivipeite.
In:
Lehtinen, M. Nurmi, P. Rämö, T. 1998.
3000 vuosimiljoonaa. Suomen Kallioperä.
Suomen Geologinen Seura, Gummerus Kirjapaino Oy, Jyväskylä 1998. 375 sivua. (Pages 165-197, Pages 189-190 and Taulukko 6.1 on page 189, Kuva 6.4 Kainuun liuskealueen pintakivien rakenteita, A, B and C color photographs on pages 173-175).

4. Laajoki, K. 1991.
Stratigraphy of the Northern End of the Early Proterozoic (Karelian) Kainuu Schist Belt,
and Associated Gneiss Complexes Finland.
Geological Survey of Finland, Bulletin 358.
Geologinen Tutkimuskeskus Espoo, 1991. (with 55 figures, 4 tables and 5 appendices).
(Pages 24-25 and Table 3. Pages 26-30 and Fig. 10 on page 28. Pages 96-97.) (Appendix 1. Map1 (important color bedrock map),
Appendix 2 (important color crossections map),
Appendix 3. Map2 (aeromagnetic map),
Appendix 4. Map 3 (ground-magnetic map),
Appendix 5. Map 4 (gravity map).)

Best Regards,

Hannu Poropudas

CONCLUSION:

Age of the Hetehongikko Member is between 2400 Ma - 2300 Ma
or about 2350 Ma. Physical weathering (regolith).

This was clearly in the reference:

2. Sturt B. A. Melezhik V. A. and Ramsay D. M. 1994.
Early Proterozoic Regolith at Pasvik, NE Norway: Palaeoenvironmental Implications for the Baltic Shield.
Terra Nova, 6, 618-633, 1994. (Page 627, Table 3. The 2.35 Gyr-old Regolith of the Baltic Shield,
Page 630, Fig. 10).
Pages 621, 624, 627, 630 / Fig. 10.

The Hetehongikko Member is in the Laanhongikko Formation in the
Kurkikylä Group in the Kainuu Schist Belt in Finland.

This Member contains regolith dated above reference.

This about 2.35 Ga seems also be the approximate age of
the Matinvaara Formation in Kurkikylä Group.

4. Laajoki, K. 1991.
Stratigraphy of the Northern End of the Early Proterozoic (Karelian) Kainuu Schist Belt, and Associated Gneiss Complexes Finland.
Geological Survey of Finland, Bulletin 358.
Geologinen Tutkimuskeskus Espoo, 1991. (with 55 figures, 4 tables and 5 appendices).
(Pages 24-25 and Table 3. Pages 26-30 and Fig. 10 on page 28. Pages 96-97.) (Appendix 1. Map1 (important color bedrock map),
Appendix 2 (important color crossections map),
Appendix 3. Map2 (aeromagnetic map),
Appendix 4. Map 3 (ground-magnetic map),
Appendix 5. Map 4 (gravity map).)
Page 27 / Fig. 9. Pages 26-29. Page 96 / Fig. 55. Pages 97-98 / Table 4.

Strand, K. 1988.
Alluvial Sedimentation and Tectonic Setting of the Early Proterozoic Kurkikylä and Kainuu Groups in Northern Finland.
In:
Laajoki, K. and Paakkola, J. (editors), 1986.
Sedimentology of the Precambrian formations in eastern and
northern Finland. 1986.
Geological Survey of Finland, Special Paper 5: 75-90, 1988.
Page77 Fig. 2.

Best Regards,

Hannu Poropudas

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

sunnuntai 1. joulukuuta 2019 klo 13.09.51 UTC+2 Hannu Poropudas kirjoitti:

On Thursday, June 27, 2019 at 12:05:22 PM UTC+3, Hannu Poropudas wrote:

On Tuesday, March 5, 2019 at 12:15:56 PM UTC+2, Hannu Poropudas wrote:

On Monday, June 25, 2018 at 9:40:10 AM UTC+3, Hannu Poropudas wrote:

I would like to have ages of the following metalavas:

1. Age of the Kaivoniitty Member in Pyöreasuo Formation in Honkajärvi Group ?

2. Age of the Nurmela Formation in Honkajärvi Group ?

3. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

4. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

CORRECTION:

4. Age of the Vihantaselänsuo Mb in Vihantaselkä Fm in Kurkikylä Group ?

5. Age of the Matinvaara Formation in Kurkikylä Group ?

(There is one old and very inaccurtate age determination
of the Matinvaara Fromation, 2271 +- 93 Ma, mentioned in Laajoki, K. 1991, (about geology of kainuu Schist Belt), if I rememeber right
and one very uncertain more recent age determination, 2400 Ma +- ? Ma.

This +- ? could mean even +- 100 Ma inaccuracy, in Huhma H. et al. 2018.
(Monograph), Geol. Soc. Surv. of Finland, Bul. 405.)

This Matinvaara Formation (metalava) above and below of which there exist
diamictites (dropstones, glacial time marks) is important to have its accurate age.

Old very inaccurate whole rock Pb-Pb Matinvaara Fm. age determination

2271 +- 93 Ma

is said to be in the reference (Strand K. references):

Sakko Matti. 1983. "announcement of the Isotope Geology Division of
the Geological Survey of Finland". 1983.

But this reference seems not exist ?
(I did not found it at least from the net with help of
Google, or
Google Scholar, or
GTK Hakku etc. databases)?

Laajoki K. 1991. mention that 2270 Ma is smallest possible age but no explanation?

I must conlude at the moment that there does not exist proper age determination for the Matinvaara Formation (metalavas) of Kurkikylä Group.

Best Regards,

Hannu Porpudas

(amateur geologist)

ONE IMPORTANT REGOLITH !!!:

Age of the Hetehongikko Member in Laanhongikko Formation in Kurkikylä Group ?
This Member contains regolith which possible could be dated ?
Type section: Map 353308 B, x = 7237.39, y= 560.43, to the north (350 degrees).
(Paper II, page 69 / Table 1, pages 70-74. in the reference (1.)).

References (1-4):
1. Strand, K. 1993.
Sedimentation in a Paleoproterozoic (Karelian) Rift to Cratonic Margin Transition, Finland.
(Dissertation).
Acta Universitatis Ouluensis Series A Scientiae Rerum Naturalium 242. University of Oulu. Printing Center Oulu 1993. (ISBN 951-42-3506-1). (Pages 1-9 & 11-35, and Papers I-IV).
( Paper I
Strand, K. 1988.
Alluvial Sedimentation and Tectonic Setting of the Early Proterozoic Kurkikylä and
Kainuu Groups in Northern Finland.
In:
Laajoki, K. and Paakkola (Editors), 1988
Sedimentology of the Precambrian Formations in Eastern and Northern Finland 1986.
Geological Survey of Finland. Spec. Paper 5: 75-90, 1988.
Paper II
Laajoki, K. Strand, K. and Härmä, P. 1989.
Lithostratigraphy of the Early Proterozoic Kainuu Schist Belt the Kurkikylä-Siikavaara Area,
Northern Finland, with Emphasis on the Genetic Approach.
Bull. Geol. Soc. Finland 61: 65-93 (1989). (Pages 65-93).
Paper III
Strand, K.O. and Laajoki, K. 1993.
Paleoprpoterozoic Glaciomarine Sedimentation in an Extensional tectonic Setting:
the Honkala Formation, Finland. (Pages 1-30), (in press).
Precambrian Research, 64 (1993) 253-271.
Paper IV
Strand, K.O. 1993.
Allocyclic Coastline Movements on the Paleoproterozoic (Rhyacian) Cratonic Margin:
the East Puolanka Group, Finland. (Pages 1-47), (submitted for publication). )

2. Sturt B. A. Melezhik V. A. and Ramsay D. M. 1994.
Early Proterozoic Regolith at Pasvik, NE Norway: Palaeoenvironmental Implications for the Baltic Shield.
Terra Nova, 6, 618-633, 1994. (Page 627, Table 3. The 2.35 Gyr-old Regolith of the Baltic Shield,
Page 630, Fig. 10).

3. Laajoki, K. 1998.
Karjalaiset Liuskealueet- mantereen ikivanha pintalkivipeite.
In:
Lehtinen, M. Nurmi, P. Rämö, T. 1998.
3000 vuosimiljoonaa. Suomen Kallioperä.
Suomen Geologinen Seura, Gummerus Kirjapaino Oy, Jyväskylä 1998. 375 sivua.
(Pages 165-197, Pages 189-190 and Taulukko 6.1 on page 189, Kuva 6.4 Kainuun liuskealueen pintakivien rakenteita, A, B and C color photographs on pages 173-175).

4. Laajoki, K. 1991.
Stratigraphy of the Northern End of the Early Proterozoic (Karelian) Kainuu Schist Belt,
and Associated Gneiss Complexes Finland.
Geological Survey of Finland, Bulletin 358.
Geologinen Tutkimuskeskus Espoo, 1991. (with 55 figures, 4 tables and 5 appendices).
(Pages 24-25 and Table 3. Pages 26-30 and Fig. 10 on page 28. Pages 96-97.)
(Appendix 1. Map1 (important color bedrock map),
Appendix 2 (important color crossections map),
Appendix 3. Map2 (aeromagnetic map),
Appendix 4. Map 3 (ground-magnetic map),
Appendix 5. Map 4 (gravity map).)

Best Regards,

Hannu Poropudas

CONCLUSION:

Age of the Hetehongikko Member is between 2400 Ma - 2300 Ma
or about 2350 Ma. Physical weathering (regolith).

This was clearly in the reference:
2. Sturt B. A. Melezhik V. A. and Ramsay D. M. 1994.
Early Proterozoic Regolith at Pasvik, NE Norway: Palaeoenvironmental Implications for the Baltic Shield.
Terra Nova, 6, 618-633, 1994. (Page 627, Table 3. The 2.35 Gyr-old Regolith of the Baltic Shield,
Page 630, Fig. 10).
Pages 621, 624, 627, 630 / Fig. 10.

Age period 2400 Ma - 2300 Ma is reference writers estimation for all these regolits.

There does not exist proper age determination of these regoliths.
Ages are from Russian side: 2453 +- 42 Ma - 2330 +- 36 Ma,
(first is Sm-Nd age determination and second is Rb-Sr age determination, not so reliable)

The Hetehongikko Member is in the Laanhongikko Formation in the
Kurkikylä Group in the Kainuu Schist Belt in Finland.

This Member contains regolith dated above reference.

This about 2.35 Ga seems also be the approximate age of
the Matinvaara Formation in Kurkikylä Group.
4. Laajoki, K. 1991.
Stratigraphy of the Northern End of the Early Proterozoic (Karelian) Kainuu Schist Belt, and Associated Gneiss Complexes Finland.
Geological Survey of Finland, Bulletin 358.
Geologinen Tutkimuskeskus Espoo, 1991. (with 55 figures, 4 tables and 5 appendices).
(Pages 24-25 and Table 3. Pages 26-30 and Fig. 10 on page 28. Pages 96-97.) (Appendix 1. Map1 (important color bedrock map),
Appendix 2 (important color crossections map),
Appendix 3. Map2 (aeromagnetic map),
Appendix 4. Map 3 (ground-magnetic map),
Appendix 5. Map 4 (gravity map).)
Page 27 / Fig. 9. Pages 26-29. Page 96 / Fig. 55. Pages 97-98 / Table 4. Strand, K. 1988.
Alluvial Sedimentation and Tectonic Setting of the Early Proterozoic Kurkikylä and Kainuu Groups in Northern Finland.
In:
Laajoki, K. and Paakkola, J. (editors), 1986.
Sedimentology of the Precambrian formations in eastern and
northern Finland. 1986.
Geological Survey of Finland, Special Paper 5: 75-90, 1988.
Page77 Fig. 2.

Best Regards,

Hannu Poropudas

--- SoupGate-Win32 v1.05
* Origin: fsxNet Usenet Gateway (21:1/5)

torstai 24. helmikuuta 2022 klo 11.11.36 UTC+2 Hannu Poropudas kirjoitti:

sunnuntai 1. joulukuuta 2019 klo 13.09.51 UTC+2 Hannu Poropudas kirjoitti:

On Thursday, June 27, 2019 at 12:05:22 PM UTC+3, Hannu Poropudas wrote:

On Tuesday, March 5, 2019 at 12:15:56 PM UTC+2, Hannu Poropudas wrote:

On Monday, June 25, 2018 at 9:40:10 AM UTC+3, Hannu Poropudas wrote:

I would like to have ages of the following metalavas:

1. Age of the Kaivoniitty Member in Pyöreasuo Formation in Honkajärvi Group ?

2. Age of the Nurmela Formation in Honkajärvi Group ?

3. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

4. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

CORRECTION:

4. Age of the Vihantaselänsuo Mb in Vihantaselkä Fm in Kurkikylä Group ?

5. Age of the Matinvaara Formation in Kurkikylä Group ?

(There is one old and very inaccurtate age determination
of the Matinvaara Fromation, 2271 +- 93 Ma, mentioned in Laajoki, K. 1991, (about geology of kainuu Schist Belt), if I rememeber right
and one very uncertain more recent age determination, 2400 Ma +- ? Ma.

This +- ? could mean even +- 100 Ma inaccuracy, in Huhma H. et al. 2018.
(Monograph), Geol. Soc. Surv. of Finland, Bul. 405.)

This Matinvaara Formation (metalava) above and below of which there exist
diamictites (dropstones, glacial time marks) is important to have its
accurate age.

Old very inaccurate whole rock Pb-Pb Matinvaara Fm. age determination

2271 +- 93 Ma

is said to be in the reference (Strand K. references):

Sakko Matti. 1983. "announcement of the Isotope Geology Division of
the Geological Survey of Finland". 1983.

But this reference seems not exist ?
(I did not found it at least from the net with help of
Google, or
Google Scholar, or
GTK Hakku etc. databases)?

Laajoki K. 1991. mention that 2270 Ma is smallest possible age but no explanation?

Age of Matinvaara Formation in Huhma H. et al 2018 was given

2400 Ma +- ?,

this means that ? = this is concluded age by Huhma H.,
(this is not directly measured age from Matinvaara Fm. and there is not detail explanation about this by Huhma H. ?)

On the other hand Laajoki K. 1991 concluded (not more closely explanated by Laajoki K.) that
age of Matinvaara Formation is greater than 2271 Ma
(possibly concluded from 2271+-93 Ma with Laajoki K. knowledge ?, and this age is measured)

Maybe I could, with certain uncertaintity, guess that this age could be in the range (?)

2271 Ma < age of Matinvaara Formation < 2400 Ma +- ?

I must conlude at the moment that there does not exist proper age determination
for the Matinvaara Formation (metalavas) of Kurkikylä Group.

Best Regards,

Hannu Porpudas

(amateur geologist)

ONE IMPORTANT REGOLITH !!!:

Age of the Hetehongikko Member in Laanhongikko Formation in Kurkikylä Group ?
This Member contains regolith which possible could be dated ?
Type section: Map 353308 B, x = 7237.39, y= 560.43, to the north (350 degrees).
(Paper II, page 69 / Table 1, pages 70-74. in the reference (1.)).

References (1-4):
1. Strand, K. 1993.
Sedimentation in a Paleoproterozoic (Karelian) Rift to Cratonic Margin Transition, Finland.
(Dissertation).
Acta Universitatis Ouluensis Series A Scientiae Rerum Naturalium 242. University of Oulu. Printing Center Oulu 1993. (ISBN 951-42-3506-1). (Pages 1-9 & 11-35, and Papers I-IV).
( Paper I
Strand, K. 1988.
Alluvial Sedimentation and Tectonic Setting of the Early Proterozoic Kurkikylä and
Kainuu Groups in Northern Finland.
In:
Laajoki, K. and Paakkola (Editors), 1988
Sedimentology of the Precambrian Formations in Eastern and Northern Finland 1986.
Geological Survey of Finland. Spec. Paper 5: 75-90, 1988.
Paper II
Laajoki, K. Strand, K. and Härmä, P. 1989.
Lithostratigraphy of the Early Proterozoic Kainuu Schist Belt the Kurkikylä-Siikavaara Area,
Northern Finland, with Emphasis on the Genetic Approach.
Bull. Geol. Soc. Finland 61: 65-93 (1989). (Pages 65-93).
Paper III
Strand, K.O. and Laajoki, K. 1993.
Paleoprpoterozoic Glaciomarine Sedimentation in an Extensional tectonic Setting:
the Honkala Formation, Finland. (Pages 1-30), (in press).
Precambrian Research, 64 (1993) 253-271.
Paper IV
Strand, K.O. 1993.
Allocyclic Coastline Movements on the Paleoproterozoic (Rhyacian) Cratonic Margin:
the East Puolanka Group, Finland. (Pages 1-47), (submitted for publication). )

2. Sturt B. A. Melezhik V. A. and Ramsay D. M. 1994.
Early Proterozoic Regolith at Pasvik, NE Norway: Palaeoenvironmental Implications for the Baltic Shield.
Terra Nova, 6, 618-633, 1994. (Page 627, Table 3. The 2.35 Gyr-old Regolith of the Baltic Shield,
Page 630, Fig. 10).

I remember that age 2.35 Ga comes from regoliths which are not directly dated (2453 Ma - 2330 Ma was the range from Sturt et al. 1994 reference, 2453 Ma was age of the layered intrusion (Sm-Nd)
and Ahmalahti Volcanics, Kola Penissua, 2330 Ma +- 36 Ma age determined somewhat unreliable method (Rb-Sr), both ages are from Russian side),

Laajoki K. (Laajoki 2005) used also Sturt B. A. et al. 1994 calculated average age 2.35 Ga
about 31 regoliths if I remember right.

Older intrusion, the Mountain Generalskaya age 2505.1 Ma +- 1.6 Ma (U-Pb, Zr bd),
exist also in Kola Penissula (PreCambrian Research, 75, 31-46, year ?).

3. Laajoki, K. 1998.
Karjalaiset Liuskealueet- mantereen ikivanha pintalkivipeite.
In:
Lehtinen, M. Nurmi, P. Rämö, T. 1998.
3000 vuosimiljoonaa. Suomen Kallioperä.
Suomen Geologinen Seura, Gummerus Kirjapaino Oy, Jyväskylä 1998. 375 sivua.
(Pages 165-197, Pages 189-190 and Taulukko 6.1 on page 189, Kuva 6.4 Kainuun liuskealueen pintakivien rakenteita, A, B and C color photographs on pages 173-175).

4. Laajoki, K. 1991.
Stratigraphy of the Northern End of the Early Proterozoic (Karelian) Kainuu Schist Belt,
and Associated Gneiss Complexes Finland.
Geological Survey of Finland, Bulletin 358.
Geologinen Tutkimuskeskus Espoo, 1991. (with 55 figures, 4 tables and 5 appendices).
(Pages 24-25 and Table 3. Pages 26-30 and Fig. 10 on page 28. Pages 96-97.)
(Appendix 1. Map1 (important color bedrock map),
Appendix 2 (important color crossections map),
Appendix 3. Map2 (aeromagnetic map),
Appendix 4. Map 3 (ground-magnetic map),
Appendix 5. Map 4 (gravity map).)

Best Regards,

Hannu Poropudas

CONCLUSION:

Age of the Hetehongikko Member is between 2400 Ma - 2300 Ma
or about 2350 Ma. Physical weathering (regolith).

This was clearly in the reference:
2. Sturt B. A. Melezhik V. A. and Ramsay D. M. 1994.
Early Proterozoic Regolith at Pasvik, NE Norway: Palaeoenvironmental Implications for the Baltic Shield.
Terra Nova, 6, 618-633, 1994. (Page 627, Table 3. The 2.35 Gyr-old Regolith of the Baltic Shield,
Page 630, Fig. 10).
Pages 621, 624, 627, 630 / Fig. 10.

Age period 2400 Ma - 2300 Ma is reference writers estimation for all these regolits.

There does not exist proper age determination of these regoliths.
Ages are from Russian side: 2453 +- 42 Ma - 2330 +- 36 Ma,
(first is Sm-Nd age determination and second is Rb-Sr age determination, not so reliable)

The Hetehongikko Member is in the Laanhongikko Formation in the
Kurkikylä Group in the Kainuu Schist Belt in Finland.

This Member contains regolith dated above reference.

This about 2.35 Ga seems also be the approximate age of
the Matinvaara Formation in Kurkikylä Group.
4. Laajoki, K. 1991.
Stratigraphy of the Northern End of the Early Proterozoic (Karelian) Kainuu Schist Belt, and Associated Gneiss Complexes Finland.
Geological Survey of Finland, Bulletin 358.
Geologinen Tutkimuskeskus Espoo, 1991. (with 55 figures, 4 tables and 5 appendices).
(Pages 24-25 and Table 3. Pages 26-30 and Fig. 10 on page 28. Pages 96-97.)
(Appendix 1. Map1 (important color bedrock map),
Appendix 2 (important color crossections map),
Appendix 3. Map2 (aeromagnetic map),
Appendix 4. Map 3 (ground-magnetic map),
Appendix 5. Map 4 (gravity map).)
Page 27 / Fig. 9. Pages 26-29. Page 96 / Fig. 55. Pages 97-98 / Table 4. Strand, K. 1988.
Alluvial Sedimentation and Tectonic Setting of the Early Proterozoic Kurkikylä and Kainuu Groups in Northern Finland.
In:
Laajoki, K. and Paakkola, J. (editors), 1986.
Sedimentology of the Precambrian formations in eastern and
northern Finland. 1986.
Geological Survey of Finland, Special Paper 5: 75-90, 1988.
Page77 Fig. 2.

Best Regards,

Hannu Poropudas

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torstai 27. kesäkuuta 2019 klo 12.05.22 UTC+3 Hannu Poropudas kirjoitti:

On Tuesday, March 5, 2019 at 12:15:56 PM UTC+2, Hannu Poropudas wrote:

On Monday, June 25, 2018 at 9:40:10 AM UTC+3, Hannu Poropudas wrote:

I would like to have ages of the following metalavas:

1. Age of the Kaivoniitty Member in Pyöreasuo Formation in Honkajärvi Group ?

2. Age of the Nurmela Formation in Honkajärvi Group ?

3. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

4. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

CORRECTION:

4. Age of the Vihantaselänsuo Mb in Vihantaselkä Fm in Kurkikylä Group ?

5. Age of the Matinvaara Formation in Kurkikylä Group ?

(There is one old and very inaccurtate age determination
of the Matinvaara Fromation, 2271 +- 93 Ma, mentioned in Laajoki, K. 1991, (about geology of kainuu Schist Belt), if I rememeber right
and one very uncertain more recent age determination, 2400 Ma +- ? Ma.

This +- ? could mean even +- 100 Ma inaccuracy, in Huhma H. et al. 2018. (Monograph), Geol. Soc. Surv. of Finland, Bul. 405.)

This Matinvaara Formation (metalava) above and below of which there exist
diamictites (dropstones, glacial time marks) is important to have its accurate age.

Best Regards,

Hannu Porpudas

(amateur geologist)

ONE IMPORTANT REGOLITH !!!:

Age of the Hetehongikko Member in Laanhongikko Formation in Kurkikylä Group ?
This Member contains regolith which possible could be dated ?
Type section: Map 353308 B, x = 7237.39, y= 560.43, to the north (350 degrees).
(Paper II, page 69 / Table 1, pages 70-74. in the reference (1.)).

Pekkarinen, L., J., 1979, used uranite U3O8 in age determination
of granitized sample (regolith?) A677 - GSF 76, Kiihtelysvaara, Mustalampi. 2340 Ma / Fig 28 / p. 55,
Table 3 / p. 55, 2322+-15 Ma, 207Pb/206/Pb age.

Maybe regolith containing some uranite U3O8 could also be found
in Hetehongikko Member in Laanhongikko Formation in Kurkikylä Group ?

If so, then age determination for this Hetehongikko Member in Laanhongikko Formation in Kurkikylä Group could be possible and then possible one
local age determination near Matinvaara Formation could be achieved ?

Reference:

Pekkarinen, L., J., 1979.
The Karelian formations and their depositional basement in the
Kiihtelysvaara - Värtsilä area, East Finland.
Geol. Surv. Finland, Bull. 301. 141 p. (https://tupa.gtk.fi/julkaisu/bulletin/bt_301.pdf)

Best Regards, Hannu Poropudas

References (1-4):
1. Strand, K. 1993.
Sedimentation in a Paleoproterozoic (Karelian) Rift to Cratonic Margin Transition, Finland.
(Dissertation).
Acta Universitatis Ouluensis Series A Scientiae Rerum Naturalium 242. University of Oulu. Printing Center Oulu 1993. (ISBN 951-42-3506-1).
(Pages 1-9 & 11-35, and Papers I-IV).
( Paper I
Strand, K. 1988.
Alluvial Sedimentation and Tectonic Setting of the Early Proterozoic Kurkikylä and
Kainuu Groups in Northern Finland.
In:
Laajoki, K. and Paakkola (Editors), 1988
Sedimentology of the Precambrian Formations in Eastern and Northern Finland 1986.
Geological Survey of Finland. Spec. Paper 5: 75-90, 1988.
Paper II
Laajoki, K. Strand, K. and Härmä, P. 1989.
Lithostratigraphy of the Early Proterozoic Kainuu Schist Belt the Kurkikylä-Siikavaara Area,
Northern Finland, with Emphasis on the Genetic Approach.
Bull. Geol. Soc. Finland 61: 65-93 (1989). (Pages 65-93).
Paper III
Strand, K.O. and Laajoki, K. 1993.
Paleoprpoterozoic Glaciomarine Sedimentation in an Extensional tectonic Setting:
the Honkala Formation, Finland. (Pages 1-30), (in press).
Precambrian Research, 64 (1993) 253-271.
Paper IV
Strand, K.O. 1993.
Allocyclic Coastline Movements on the Paleoproterozoic (Rhyacian) Cratonic Margin:
the East Puolanka Group, Finland. (Pages 1-47), (submitted for publication). )

2. Sturt B. A. Melezhik V. A. and Ramsay D. M. 1994.
Early Proterozoic Regolith at Pasvik, NE Norway: Palaeoenvironmental Implications for the Baltic Shield.
Terra Nova, 6, 618-633, 1994. (Page 627, Table 3. The 2.35 Gyr-old Regolith of the Baltic Shield,
Page 630, Fig. 10).

3. Laajoki, K. 1998.
Karjalaiset Liuskealueet- mantereen ikivanha pintalkivipeite.
In:
Lehtinen, M. Nurmi, P. Rämö, T. 1998.
3000 vuosimiljoonaa. Suomen Kallioperä.
Suomen Geologinen Seura, Gummerus Kirjapaino Oy, Jyväskylä 1998. 375 sivua.
(Pages 165-197, Pages 189-190 and Taulukko 6.1 on page 189, Kuva 6.4 Kainuun liuskealueen pintakivien rakenteita, A, B and C color photographs on pages 173-175).

4. Laajoki, K. 1991.
Stratigraphy of the Northern End of the Early Proterozoic (Karelian) Kainuu Schist Belt,
and Associated Gneiss Complexes Finland.
Geological Survey of Finland, Bulletin 358.
Geologinen Tutkimuskeskus Espoo, 1991. (with 55 figures, 4 tables and 5 appendices).
(Pages 24-25 and Table 3. Pages 26-30 and Fig. 10 on page 28. Pages 96-97.) (Appendix 1. Map1 (important color bedrock map),
Appendix 2 (important color crossections map),
Appendix 3. Map2 (aeromagnetic map),
Appendix 4. Map 3 (ground-magnetic map),
Appendix 5. Map 4 (gravity map).)

Best Regards,

Hannu Poropudas

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tiistai 24. tammikuuta 2023 klo 12.08.14 UTC+2 Hannu Poropudas kirjoitti:

torstai 27. kesäkuuta 2019 klo 12.05.22 UTC+3 Hannu Poropudas kirjoitti:

On Tuesday, March 5, 2019 at 12:15:56 PM UTC+2, Hannu Poropudas wrote:

On Monday, June 25, 2018 at 9:40:10 AM UTC+3, Hannu Poropudas wrote:

I would like to have ages of the following metalavas:

1. Age of the Kaivoniitty Member in Pyöreasuo Formation in Honkajärvi Group ?

2. Age of the Nurmela Formation in Honkajärvi Group ?

3. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

4. Age of the Nyrhioja Memeber in Vihantiselkä Formation in Kurkikylä Group ?

CORRECTION:

4. Age of the Vihantaselänsuo Mb in Vihantaselkä Fm in Kurkikylä Group ?

5. Age of the Matinvaara Formation in Kurkikylä Group ?

(There is one old and very inaccurtate age determination
of the Matinvaara Fromation, 2271 +- 93 Ma, mentioned in Laajoki, K. 1991, (about geology of kainuu Schist Belt), if I rememeber right
and one very uncertain more recent age determination, 2400 Ma +- ? Ma.

This +- ? could mean even +- 100 Ma inaccuracy, in Huhma H. et al. 2018.
(Monograph), Geol. Soc. Surv. of Finland, Bul. 405.)

This Matinvaara Formation (metalava) above and below of which there exist
diamictites (dropstones, glacial time marks) is important to have its accurate age.

Best Regards,

Hannu Porpudas

(amateur geologist)

ONE IMPORTANT REGOLITH !!!:

Age of the Hetehongikko Member in Laanhongikko Formation in Kurkikylä Group ?
This Member contains regolith which possible could be dated ?
Type section: Map 353308 B, x = 7237.39, y= 560.43, to the north (350 degrees).
(Paper II, page 69 / Table 1, pages 70-74. in the reference (1.)).

Pekkarinen, L., J., 1979, used uranite U3O8 in age determination
of granitized sample (regolith?) A677 - GSF 76, Kiihtelysvaara, Mustalampi. 2340 Ma / Fig 28 / p. 55,
Table 3 / p. 55, 2322+-15 Ma, 207Pb/206/Pb age.

Maybe regolith containing some uranite U3O8 could also be found
in Hetehongikko Member in Laanhongikko Formation in Kurkikylä Group ?

If so, then age determination for this Hetehongikko Member in Laanhongikko Formation in Kurkikylä Group could be possible and then possible one
local age determination near Matinvaara Formation could be achieved ?

Reference:

Pekkarinen, L., J., 1979.
The Karelian formations and their depositional basement in the Kiihtelysvaara - Värtsilä area, East Finland.
Geol. Surv. Finland, Bull. 301. 141 p. (https://tupa.gtk.fi/julkaisu/bulletin/bt_301.pdf)

Best Regards, Hannu Poropudas

ONE NOTE:
In this Pekkarinen, L., J., 1979 book there was a good photograph of hydrothermal quartz vein with some cubic crystals of uranite U3O8 where
this smaple was dated 2322+-15 Ma and also 2340 Ma / Fig 28 / p. 55.

Hannu

References (1-4):
1. Strand, K. 1993.
Sedimentation in a Paleoproterozoic (Karelian) Rift to Cratonic Margin Transition, Finland.
(Dissertation).
Acta Universitatis Ouluensis Series A Scientiae Rerum Naturalium 242. University of Oulu. Printing Center Oulu 1993. (ISBN 951-42-3506-1). (Pages 1-9 & 11-35, and Papers I-IV).
( Paper I
Strand, K. 1988.
Alluvial Sedimentation and Tectonic Setting of the Early Proterozoic Kurkikylä and
Kainuu Groups in Northern Finland.
In:
Laajoki, K. and Paakkola (Editors), 1988
Sedimentology of the Precambrian Formations in Eastern and Northern Finland 1986.
Geological Survey of Finland. Spec. Paper 5: 75-90, 1988.
Paper II
Laajoki, K. Strand, K. and Härmä, P. 1989.
Lithostratigraphy of the Early Proterozoic Kainuu Schist Belt the Kurkikylä-Siikavaara Area,
Northern Finland, with Emphasis on the Genetic Approach.
Bull. Geol. Soc. Finland 61: 65-93 (1989). (Pages 65-93).
Paper III
Strand, K.O. and Laajoki, K. 1993.
Paleoprpoterozoic Glaciomarine Sedimentation in an Extensional tectonic Setting:
the Honkala Formation, Finland. (Pages 1-30), (in press).
Precambrian Research, 64 (1993) 253-271.
Paper IV
Strand, K.O. 1993.
Allocyclic Coastline Movements on the Paleoproterozoic (Rhyacian) Cratonic Margin:
the East Puolanka Group, Finland. (Pages 1-47), (submitted for publication). )

2. Sturt B. A. Melezhik V. A. and Ramsay D. M. 1994.
Early Proterozoic Regolith at Pasvik, NE Norway: Palaeoenvironmental Implications for the Baltic Shield.
Terra Nova, 6, 618-633, 1994. (Page 627, Table 3. The 2.35 Gyr-old Regolith of the Baltic Shield,
Page 630, Fig. 10).

3. Laajoki, K. 1998.
Karjalaiset Liuskealueet- mantereen ikivanha pintalkivipeite.
In:
Lehtinen, M. Nurmi, P. Rämö, T. 1998.
3000 vuosimiljoonaa. Suomen Kallioperä.
Suomen Geologinen Seura, Gummerus Kirjapaino Oy, Jyväskylä 1998. 375 sivua.
(Pages 165-197, Pages 189-190 and Taulukko 6.1 on page 189, Kuva 6.4 Kainuun liuskealueen pintakivien rakenteita, A, B and C color photographs on pages 173-175).

4. Laajoki, K. 1991.
Stratigraphy of the Northern End of the Early Proterozoic (Karelian) Kainuu Schist Belt,
and Associated Gneiss Complexes Finland.
Geological Survey of Finland, Bulletin 358.
Geologinen Tutkimuskeskus Espoo, 1991. (with 55 figures, 4 tables and 5 appendices).
(Pages 24-25 and Table 3. Pages 26-30 and Fig. 10 on page 28. Pages 96-97.)
(Appendix 1. Map1 (important color bedrock map),
Appendix 2 (important color crossections map),
Appendix 3. Map2 (aeromagnetic map),
Appendix 4. Map 3 (ground-magnetic map),
Appendix 5. Map 4 (gravity map).)

Best Regards,

Hannu Poropudas

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