Improved methods for isolating and validating indigenous biomarkers in Precambrian rocks
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These patterns support earlier observations that biomarkers and bitumen are enriched on surfaces of conventionally drilled and curated samples relative to their interiors.
“These patterns substantiate earlier observations of biomarker and bitumen enrichments on the surfaces of conventionally drilled and curated samples relative to the interiors (3,6,11).”
From Reappraisal of hydrocarbon biomarkers in Archean rocks (2015) · cites this paper as [6]
Known vectors and signatures of contamination, such as surface enrichments, are independent of sampling locality.
“Moreover, known vectors and signatures of contamination (i.e., surface enrichments) are independent of sampling locality (6,11).”
From Reappraisal of hydrocarbon biomarkers in Archean rocks (2015) · cites this paper as [6]
Contamination is the only explanation for the reproducible surficial hopanes and steranes in conventionally drilled and curated Archean samples and for the undetectable or blank-level hopanes and steranes in the ultraclean AIDP cores.
“Instead, contamination is the only explanation for the reproducibility of the detectable surficial hopanes and steranes in conventionally drilled and curated Archean samples (3,6,7,11) and the undetectable or blank level-equivalent hopane and sterane concentrations in samples from the ultraclean AIDP drill cores.”
From Reappraisal of hydrocarbon biomarkers in Archean rocks (2015) · cites this paper as [6]
Sawing can add significant but variable hydrocarbon contaminants to the substrate, yet cumulative blanks in previous studies did not record the contribution from sawing.
“the analyses of the saw blade (before it was heat treated) and the sawed surfaces of the RHDH2A quarter-core highlight that sawing can contribute significant but variable hydrocarbon contaminants to the substrate, yet the cumulative blanks reported in previous studies did not record the hydrocarbon contribution from sawing (1,4,6,7).”
From Reappraisal of hydrocarbon biomarkers in Archean rocks (2015) · cites this paper as [6]
According to H/C ratios and other thermal history indicators, the metamorphic grades of AIDP-2 and AIDP-3 are similar to or lower than those of rocks from which biomarkers were previously reported.
“According to currently available H/C ratios and other indicators of thermal history, the metamorphic grades of AIDP-2 and AIDP-3 are similar to (1-4, 6, 7, 15, 21, 26) or lower than (5,22,23) the metamorphic grades of the rocks from which biomarkers have been previously reported.”
From Reappraisal of hydrocarbon biomarkers in Archean rocks (2015) · cites this paper as [6]
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Self-citation
- Authors
- Sherman, L. S., Waldbauer, J. R., & Summons, R. E.
- Affiliations
- Massachusetts Institute of Technology (US)
- Corresponding author
- Summons, Roger E.
- Venue
- Organic Geochemistry
- Publisher
- Elsevier BV
- Published
- 2007-12
- Volume
- 38
- Issue
- 12
- Pages
- 1987-2000
- ISSN
- 0146-6380 (ISSN-L)
- OpenAlex
- W2077060514
- Cited by
- 71
- References
- 36
- Citations by year
- 2026: 1 · 2025: 1 · 2022: 3 · 2021: 4 · 2020: 1 · 2019: 4 · 2018: 6 · 2017: 3 · 2016: 2 · 2015: 6 · 2014: 10 · 2013: 5 · 2012: 5
- FWCI
- 3.79
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Organic Geochemistry (publishedVersion)
- Funders
- National Science Foundation
- Agouron Institute
- NASA Astrobiology Institute
- National Defense Science and Engineering Graduate
- Office of Naval Research
- Topics
- Physical Sciences › Earth and Planetary Sciences › Paleontology › Paleontology and Stratigraphy of Fossils
- Physical Sciences › Physics and Astronomy › Astronomy and Astrophysics › Origins and Evolution of Life
- Physical Sciences › Engineering › Mechanics of Materials › Hydrocarbon exploration and reservoir analysis
- Keywords
- hydrocarbon biomarkers, Precambrian rocks, Archean, Paleoproterozoic, early evolution of life, laboratory contamination
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