Major element distribution in Archean banded iron formation (BIF): influence of metamorphic differentiation
Abstract The Archean (2.8 Ga) Banded Iron Formation (BIF) of the Bell Lake region of Yellowknife greenstone belt, Canada is recrystallized to metamorphic assemblages of the amphibolite facies. This BIF is characterized by centimetre‐scale Fe‐rich and Si‐rich mesobands. In the Si‐rich mesobands, thin...
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crwiley:10.1111/j.1525-1314.2012.00975.x 2024-09-15T18:41:02+00:00 Major element distribution in Archean banded iron formation (BIF): influence of metamorphic differentiation KATSUTA, N. SHIMIZU, I. HELMSTAEDT, H. TAKANO, M. KAWAKAMI, S. KUMAZAWA, M. 2012 http://dx.doi.org/10.1111/j.1525-1314.2012.00975.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1525-1314.2012.00975.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1525-1314.2012.00975.x en eng Wiley http://onlinelibrary.wiley.com/termsAndConditions#vor Journal of Metamorphic Geology volume 30, issue 5, page 457-472 ISSN 0263-4929 1525-1314 journal-article 2012 crwiley https://doi.org/10.1111/j.1525-1314.2012.00975.x 2024-08-09T04:26:52Z Abstract The Archean (2.8 Ga) Banded Iron Formation (BIF) of the Bell Lake region of Yellowknife greenstone belt, Canada is recrystallized to metamorphic assemblages of the amphibolite facies. This BIF is characterized by centimetre‐scale Fe‐rich and Si‐rich mesobands. In the Si‐rich mesobands, thin layers of magnetite microbands are developed in a quartz matrix. The Fe‐rich mesobands are composed mainly of Ca‐amphibole (hornblende), Fe–Mg amphibole (grunerite), and magnetite. The metamorphic foliation locally cuts across the mesoband boundaries, indicating the mesobanding was formed prior to peak metamorphism. Variations in mineral modal proportions between Fe‐rich mesobands and microbands are diagnostic of depositional compositional differences between beds. Micro‐X‐ray fluorescence imaging reveals metamorphic differentiation within Fe‐rich mesobands, with segregation of Fe–Mg amphibole, and the incompatible element Mn is concentrated at the margins of the Fe‐rich mesobands during the amphibole‐forming reactions. Ti was relatively immobile during metamorphic segregation and its distribution provides a record of the original structures in the Fe‐rich mesobands. Article in Journal/Newspaper Yellowknife Wiley Online Library Journal of Metamorphic Geology 30 5 457 472 |
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English |
description |
Abstract The Archean (2.8 Ga) Banded Iron Formation (BIF) of the Bell Lake region of Yellowknife greenstone belt, Canada is recrystallized to metamorphic assemblages of the amphibolite facies. This BIF is characterized by centimetre‐scale Fe‐rich and Si‐rich mesobands. In the Si‐rich mesobands, thin layers of magnetite microbands are developed in a quartz matrix. The Fe‐rich mesobands are composed mainly of Ca‐amphibole (hornblende), Fe–Mg amphibole (grunerite), and magnetite. The metamorphic foliation locally cuts across the mesoband boundaries, indicating the mesobanding was formed prior to peak metamorphism. Variations in mineral modal proportions between Fe‐rich mesobands and microbands are diagnostic of depositional compositional differences between beds. Micro‐X‐ray fluorescence imaging reveals metamorphic differentiation within Fe‐rich mesobands, with segregation of Fe–Mg amphibole, and the incompatible element Mn is concentrated at the margins of the Fe‐rich mesobands during the amphibole‐forming reactions. Ti was relatively immobile during metamorphic segregation and its distribution provides a record of the original structures in the Fe‐rich mesobands. |
format |
Article in Journal/Newspaper |
author |
KATSUTA, N. SHIMIZU, I. HELMSTAEDT, H. TAKANO, M. KAWAKAMI, S. KUMAZAWA, M. |
spellingShingle |
KATSUTA, N. SHIMIZU, I. HELMSTAEDT, H. TAKANO, M. KAWAKAMI, S. KUMAZAWA, M. Major element distribution in Archean banded iron formation (BIF): influence of metamorphic differentiation |
author_facet |
KATSUTA, N. SHIMIZU, I. HELMSTAEDT, H. TAKANO, M. KAWAKAMI, S. KUMAZAWA, M. |
author_sort |
KATSUTA, N. |
title |
Major element distribution in Archean banded iron formation (BIF): influence of metamorphic differentiation |
title_short |
Major element distribution in Archean banded iron formation (BIF): influence of metamorphic differentiation |
title_full |
Major element distribution in Archean banded iron formation (BIF): influence of metamorphic differentiation |
title_fullStr |
Major element distribution in Archean banded iron formation (BIF): influence of metamorphic differentiation |
title_full_unstemmed |
Major element distribution in Archean banded iron formation (BIF): influence of metamorphic differentiation |
title_sort |
major element distribution in archean banded iron formation (bif): influence of metamorphic differentiation |
publisher |
Wiley |
publishDate |
2012 |
url |
http://dx.doi.org/10.1111/j.1525-1314.2012.00975.x https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1111%2Fj.1525-1314.2012.00975.x https://onlinelibrary.wiley.com/doi/pdf/10.1111/j.1525-1314.2012.00975.x |
genre |
Yellowknife |
genre_facet |
Yellowknife |
op_source |
Journal of Metamorphic Geology volume 30, issue 5, page 457-472 ISSN 0263-4929 1525-1314 |
op_rights |
http://onlinelibrary.wiley.com/termsAndConditions#vor |
op_doi |
https://doi.org/10.1111/j.1525-1314.2012.00975.x |
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Journal of Metamorphic Geology |
container_volume |
30 |
container_issue |
5 |
container_start_page |
457 |
op_container_end_page |
472 |
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1810485422299545600 |