date: 2019-12-28T08:35:57Z
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pdf:docinfo:title: Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland
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subject: 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 (D) of apatite from the Isua belt; therefore, D values are not indicative of primary conditions in the Archean. Here, we report the first in situ chlorine isotope (37Cl) 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 37ClSMOC 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 37Cl values cannot uniquely document primary signatures of apatite crystals, but the results are nonetheless helpful for assessing the extent of secondary overprint.
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dc:title: Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland
modified: 2019-12-28T08:35:57Z
cp:subject: 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 (D) of apatite from the Isua belt; therefore, D values are not indicative of primary conditions in the Archean. Here, we report the first in situ chlorine isotope (37Cl) 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 37ClSMOC 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 37Cl values cannot uniquely document primary signatures of apatite crystals, but the results are nonetheless helpful for assessing the extent of secondary overprint.
pdf:docinfo:subject: 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 (D) of apatite from the Isua belt; therefore, D values are not indicative of primary conditions in the Archean. Here, we report the first in situ chlorine isotope (37Cl) 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 37ClSMOC 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 37Cl values cannot uniquely document primary signatures of apatite crystals, but the results are nonetheless helpful for assessing the extent of secondary overprint.
pdf:docinfo:creator: Alicja Wudarska, Ewa S?aby, Michael Wiedenbeck, ?ukasz Birski, Richard Wirth, Jens Götze, Aivo Lepland, Christof Kusebauch and Izabela Kocjan
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meta:author: Alicja Wudarska, Ewa S?aby, Michael Wiedenbeck, ?ukasz Birski, Richard Wirth, Jens Götze, Aivo Lepland, Christof Kusebauch and Izabela Kocjan
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Creation-Date: 2019-12-28T08:35:57Z
Author: Alicja Wudarska, Ewa S?aby, Michael Wiedenbeck, ?ukasz Birski, Richard Wirth, Jens Götze, Aivo Lepland, Christof Kusebauch and Izabela Kocjan
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Keywords: chlorine isotopes; apatite; Isua; Archean; SIMS; TEM; cathodoluminescence; geochemistry
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dc:creator: Alicja Wudarska, Ewa S?aby, Michael Wiedenbeck, ?ukasz Birski, Richard Wirth, Jens Götze, Aivo Lepland, Christof Kusebauch and Izabela Kocjan
dcterms:created: 2019-12-28T08:35:57Z
Last-Modified: 2019-12-28T08:35:57Z
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title: Chlorine Isotope Composition of Apatite from the >3.7 Ga Isua Supracrustal Belt, SW Greenland
Last-Save-Date: 2019-12-28T08:35:57Z
pdf:docinfo:keywords: chlorine isotopes; apatite; Isua; Archean; SIMS; TEM; cathodoluminescence; geochemistry
pdf:docinfo:modified: 2019-12-28T08:35:57Z
meta:save-date: 2019-12-28T08:35:57Z
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creator: Alicja Wudarska, Ewa S?aby, Michael Wiedenbeck, ?ukasz Birski, Richard Wirth, Jens Götze, Aivo Lepland, Christof Kusebauch and Izabela Kocjan
dc:subject: chlorine isotopes; apatite; Isua; Archean; SIMS; TEM; cathodoluminescence; geochemistry
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meta:keyword: chlorine isotopes; apatite; Isua; Archean; SIMS; TEM; cathodoluminescence; geochemistry
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pdf:docinfo:created: 2019-12-28T08:35:57Z