Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland
| العنوان: | Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland |
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| المؤلفون: | Michael Wiedenbeck, Alicja Wudarska, Łukasz Birski, Aivo Lepland, Richard Wirth, Ewa Słaby, Christof Kusebauch, Izabela Kocjan, Jens Götze |
| المصدر: | Minerals Minerals, Vol 10, Iss 1, p 27 (2019) |
| سنة النشر: | 2020 |
| مصطلحات موضوعية: | sims, lcsh:QE351-399.2, 010504 meteorology & atmospheric sciences, Archean, Geochemistry, Metamorphism, Cathodoluminescence, 010502 geochemistry & geophysics, 01 natural sciences, Apatite, tem, chlorine isotopes, geochemistry, 0105 earth and related environmental sciences, lcsh:Mineralogy, Isotopes of chlorine, archean, cathodoluminescence, Geology, Geotechnical Engineering and Engineering Geology, Early Earth, Secondary ion mass spectrometry, apatite, visual_art, visual_art.visual_art_medium, Banded iron formation, isua |
| الوصف: | 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. |
| وصف الملف: | application/pdf |
| اللغة: | English |
| URL الوصول: | https://explore.openaire.eu/search/publication?articleId=doi_dedup___::25f9154c88d29bedbdde0d22f942523d https://gfzpublic.gfz-potsdam.de/pubman/item/item_5000093_1/component/file_5000095/5000093.pdf |
| Rights: | OPEN |
| رقم الانضمام: | edsair.doi.dedup.....25f9154c88d29bedbdde0d22f942523d |
| قاعدة البيانات: | OpenAIRE |
| الوصف غير متاح. |