Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland
The study of the oldest surviving rock suites is crucial for understanding the processes that shaped the early Earth and formed an environment suitable for life. The metasedimentary and metavolcanic rocks of the early Archean Isua supracrustal belt contain abundant apatite, the geochemical signature...
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2020
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ftgfzpotsdam:oai:gfzpublic.gfz-potsdam.de:item_5000093 2023-05-15T16:29:23+02:00 Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland Wudarska, A. Słaby, E. Wiedenbeck, M. Birski, Ł. Wirth, R. Götze, J. Lepland, A. Kusebauch, C. Kocjan, I. 2020 application/pdf https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000093 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000093_1/component/file_5000095/5000093.pdf eng eng info:eu-repo/semantics/altIdentifier/doi/10.3390/min10010027 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000093 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000093_1/component/file_5000095/5000093.pdf info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ CC-BY Minerals info:eu-repo/semantics/article 2020 ftgfzpotsdam https://doi.org/10.3390/min10010027 2022-09-14T05:57:28Z The study of the oldest surviving rock suites is crucial for understanding the processes that shaped the early Earth and formed an environment suitable for life. The metasedimentary and metavolcanic rocks of the early Archean Isua supracrustal belt contain abundant apatite, the geochemical signatures of which may help decipher ancient environmental conditions. However, previous research has shown that secondary processes, including amphibolite-facies metamorphism, have reset the original hydrogen isotope composition (δD) of apatite from the Isua belt; therefore, δD values are not indicative of primary conditions in the Archean. Here, we report the first in situ chlorine isotope (δ37Cl) analyses by Secondary Ion Mass Spectrometry (SIMS) from Isua apatite, which we combine with information from transmission electron microscopy, cathodoluminescence imaging, and spectroscopy, documenting the micron-scale internal features of apatite crystals. The determined δ37ClSMOC values (chlorine isotope ratios vs. standard mean ocean chloride) fall within a range from −0.8‰ to 1.6‰, with the most extreme values recorded by two banded iron formation samples. Our results show that δ37Cl values cannot uniquely document primary signatures of apatite crystals, but the results are nonetheless helpful for assessing the extent of secondary overprint Article in Journal/Newspaper Greenland GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) Greenland Minerals 10 1 27 |
institution |
Open Polar |
collection |
GFZpublic (German Research Centre for Geosciences, Helmholtz-Zentrum Potsdam) |
op_collection_id |
ftgfzpotsdam |
language |
English |
description |
The study of the oldest surviving rock suites is crucial for understanding the processes that shaped the early Earth and formed an environment suitable for life. The metasedimentary and metavolcanic rocks of the early Archean Isua supracrustal belt contain abundant apatite, the geochemical signatures of which may help decipher ancient environmental conditions. However, previous research has shown that secondary processes, including amphibolite-facies metamorphism, have reset the original hydrogen isotope composition (δD) of apatite from the Isua belt; therefore, δD values are not indicative of primary conditions in the Archean. Here, we report the first in situ chlorine isotope (δ37Cl) analyses by Secondary Ion Mass Spectrometry (SIMS) from Isua apatite, which we combine with information from transmission electron microscopy, cathodoluminescence imaging, and spectroscopy, documenting the micron-scale internal features of apatite crystals. The determined δ37ClSMOC values (chlorine isotope ratios vs. standard mean ocean chloride) fall within a range from −0.8‰ to 1.6‰, with the most extreme values recorded by two banded iron formation samples. Our results show that δ37Cl values cannot uniquely document primary signatures of apatite crystals, but the results are nonetheless helpful for assessing the extent of secondary overprint |
format |
Article in Journal/Newspaper |
author |
Wudarska, A. Słaby, E. Wiedenbeck, M. Birski, Ł. Wirth, R. Götze, J. Lepland, A. Kusebauch, C. Kocjan, I. |
spellingShingle |
Wudarska, A. Słaby, E. Wiedenbeck, M. Birski, Ł. Wirth, R. Götze, J. Lepland, A. Kusebauch, C. Kocjan, I. Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland |
author_facet |
Wudarska, A. Słaby, E. Wiedenbeck, M. Birski, Ł. Wirth, R. Götze, J. Lepland, A. Kusebauch, C. Kocjan, I. |
author_sort |
Wudarska, A. |
title |
Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland |
title_short |
Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland |
title_full |
Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland |
title_fullStr |
Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland |
title_full_unstemmed |
Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland |
title_sort |
chlorine isotope composition of apatite from the >3.7 ga isua supracrustal belt, sw greenland |
publishDate |
2020 |
url |
https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000093 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000093_1/component/file_5000095/5000093.pdf |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland |
genre_facet |
Greenland |
op_source |
Minerals |
op_relation |
info:eu-repo/semantics/altIdentifier/doi/10.3390/min10010027 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000093 https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000093_1/component/file_5000095/5000093.pdf |
op_rights |
info:eu-repo/semantics/openAccess http://creativecommons.org/licenses/by/4.0/ |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.3390/min10010027 |
container_title |
Minerals |
container_volume |
10 |
container_issue |
1 |
container_start_page |
27 |
_version_ |
1766019072018874368 |