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Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland

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Wudarska,  Alicja
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Słaby,  Ewa
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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Wiedenbeck,  Michael
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Birski,  Łukasz
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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Wirth,  R.
3.5 Interface Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Götze,  Jens
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Lepland,  Aivo
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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Kusebauch,  C.
3.1 Inorganic and Isotope Geochemistry, 3.0 Geochemistry, Departments, GFZ Publication Database, Deutsches GeoForschungsZentrum;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

Kocjan,  Izabela
External Organizations;
GFZ SIMS Publications, Deutsches GeoForschungsZentrum;

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5000093.pdf
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Zitation

Wudarska, A., Słaby, E., Wiedenbeck, M., Birski, Ł., Wirth, R., Götze, J., Lepland, A., Kusebauch, C., Kocjan, I. (2020): Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland. - Minerals, 10, 1, 27.
https://doi.org/10.3390/min10010027


Zitierlink: https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000093
Zusammenfassung
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