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Title: Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon

Abstract

Here, evidence of life on Earth is manifestly preserved in the rock record. However, the microfossil record only extends to ~3.5 billion years (Ga), the chemofossil record arguably to ~3.8 Ga, and the rock record to 4.0 Ga. Detrital zircons from Jack Hills, Western Australia range in age up to nearly 4.4 Ga. From a population of over 10,000 Jack Hills zircons, we identified one >3.8-Ga zircon that contains primary graphite inclusions. Here, we report carbon isotopic measurements on these inclusions in a concordant, 4.10 ± 0.01-Ga zircon. We interpret these inclusions as primary due to their enclosure in a crack-free host as shown by transmission X-ray microscopy and their crystal habit. Their δ13CPDB of –24 ± 5‰ is consistent with a biogenic origin and may be evidence that a terrestrial biosphere had emerged by 4.1 Ga, or ~300 My earlier than has been previously proposed.

Authors:
 [1]; ORCiD logo [1];  [1];  [2]
  1. Univ. of California, Los Angeles, CA (United States)
  2. Stanford Univ., Stanford, CA (United States)
Publication Date:
Research Org.:
SLAC National Accelerator Lab., Menlo Park, CA (United States)
Sponsoring Org.:
USDOE
OSTI Identifier:
1313070
Grant/Contract Number:  
293529; NSF-EAR-0948724; NSF-EAR-1055454; AC02-76SF00515
Resource Type:
Accepted Manuscript
Journal Name:
Proceedings of the National Academy of Sciences of the United States of America
Additional Journal Information:
Journal Volume: 112; Journal Issue: 47; Journal ID: ISSN 0027-8424
Publisher:
National Academy of Sciences, Washington, DC (United States)
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; Hadean; carbon isotopes; early Earth; zircon; origin of life

Citation Formats

Bell, Elizabeth A., Boehnke, Patrick, Harrison, T. Mark, and Mao, Wendy L. Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon. United States: N. p., 2015. Web. doi:10.1073/pnas.1517557112.
Bell, Elizabeth A., Boehnke, Patrick, Harrison, T. Mark, & Mao, Wendy L. Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon. United States. doi:https://doi.org/10.1073/pnas.1517557112
Bell, Elizabeth A., Boehnke, Patrick, Harrison, T. Mark, and Mao, Wendy L. Mon . "Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon". United States. doi:https://doi.org/10.1073/pnas.1517557112. https://www.osti.gov/servlets/purl/1313070.
@article{osti_1313070,
title = {Potentially biogenic carbon preserved in a 4.1 billion-year-old zircon},
author = {Bell, Elizabeth A. and Boehnke, Patrick and Harrison, T. Mark and Mao, Wendy L.},
abstractNote = {Here, evidence of life on Earth is manifestly preserved in the rock record. However, the microfossil record only extends to ~3.5 billion years (Ga), the chemofossil record arguably to ~3.8 Ga, and the rock record to 4.0 Ga. Detrital zircons from Jack Hills, Western Australia range in age up to nearly 4.4 Ga. From a population of over 10,000 Jack Hills zircons, we identified one >3.8-Ga zircon that contains primary graphite inclusions. Here, we report carbon isotopic measurements on these inclusions in a concordant, 4.10 ± 0.01-Ga zircon. We interpret these inclusions as primary due to their enclosure in a crack-free host as shown by transmission X-ray microscopy and their crystal habit. Their δ13CPDB of –24 ± 5‰ is consistent with a biogenic origin and may be evidence that a terrestrial biosphere had emerged by 4.1 Ga, or ~300 My earlier than has been previously proposed.},
doi = {10.1073/pnas.1517557112},
journal = {Proceedings of the National Academy of Sciences of the United States of America},
number = 47,
volume = 112,
place = {United States},
year = {2015},
month = {10}
}

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