Microstructure-specific carbon isotopic signatures of organic matter from ∼3.5 Ga cherts of the Pilbara Craton support a biologic origin
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- 作者：Navot Moraga ; morag@wisc.edu" class="auth_mail" title="E-mail the corresponding author ; Kenneth H. Williforda ; b ; Kouki Kitajimaa ; Pascal Philippotc ; Martin J. Van Kranendonkd ; Kevin Lepota ; e ; Christophe Thomazoc ; f ; John W. Valleya
- 关键词：Dresser Formation ; Organic matter ; Carbon isotope ratio ; SIMS ; Microfossils ; Pilbara craton
- 刊名：Precambrian Research
- 出版年：2016
- 出版时间：April 2016
- 年：2016
- 卷：275
- 期：Complete
- 页码：429-449
- 全文大小：10931 K
文摘
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In situ carbon isotopic analysis of ∼3.5 Ga organic matter and coexisting carbonate.
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δ13C values in specific organic microstructures range between −33.6‰ and −25.7‰.
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The range of δ13C(OM) values represents primary variability of organic matter.
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Correlation between δ13C values and microstructures argues against abiotic origin.
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The range of δ13C(OM) and Δ13C(Carb-OM) values supports variable C-fixation paths.