Oxidation of the Ediacaran Ocean
- D. Fike, J. Grotzinger, L. Pratt, R. Summons
- Geography, Environmental ScienceNature
- 7 December 2006
High-resolution carbon isotope and sulphur isotope records from the Huqf Supergroup, Sultanate of Oman, that cover most of the Ediacaran period indicate that the ocean became increasingly oxygenated after the end of the Marinoan glaciation and allow us to identify three distinct stages of oxidation.
Environmental Genomics Reveals a Single-Species Ecosystem Deep Within Earth
- D. Chivian, Eoin L. Brodie, T. Onstott
- BiologyScience
- 10 October 2008
DNA from low-biodiversity fracture water collected at 2.8-kilometer depth in a South African gold mine was sequenced and assembled into a single, complete genome that indicates a motile, sporulating, sulfate-reducing, chemoautotrophic thermophile that can fix its own nitrogen and carbon by using machinery shared with archaea.
Geochemical and climatic effects of increased marine organic carbon burial at the Cenomanian/Turonian boundary
Perhaps the most significant event in the Cretaceous record of the carbon isotope composition of carbonate1,2, other than the 1–2.5 ‰ negative shift in the carbon isotope composition of calcareous…
Long-Term Sustainability of a High-Energy, Low-Diversity Crustal Biome
- Li‐Hung Lin, Pei-Ling Wang, T. Onstott
- Environmental ScienceScience
- 20 October 2006
Geochemical, microbiological, and molecular analyses of alkaline saline groundwater at 2.8 kilometers depth in Archaean metabasalt revealed a microbial biome dominated by a single phylotype…
Effects of Rapid Global Warming at the Paleocene-Eocene Boundary on Neotropical Vegetation
- C. Jaramillo, Diana Ochoa, J. Vervoort
- Environmental Science, GeographyScience
- 12 November 2010
Palynology shows that the tropical rainforest was able to persist under elevated temperatures and high levels of atmospheric carbon dioxide, in contrast to speculations that tropical ecosystems were severely compromised by heat stress.
Superheavy pyrite (δ34Spyr > δ34SCAS) in the terminal Proterozoic Nama Group, southern Namibia: A consequence of low seawater sulfate at the dawn of animal life
- J. Ries, D. Fike, L. Pratt, T. Lyons, J. Grotzinger
- Environmental Science, Geology
- 1 August 2009
Sulfur isotope analysis (δ^(34)S) of well-preserved carbonates spanning an ~10 Ma interval of the terminal Proterozoic Nama Group reveals that disseminated pyrite is consistently enriched in ^(34)S…
Hydrogeologic controls on episodic H2 release from precambrian fractured rocks--energy for deep subsurface life on earth and mars.
- B. Sherwood Lollar, K. Voglesonger, L. Pratt
- GeologyAstrobiology
- 28 December 2007
Findings indicate that deep Precambrian Shield fracture waters contain some of the highest levels of dissolved H(2) ever reported and represent a potentially important energy-rich environment for subsurface microbial life.
Paleo-oceanographic cycles and events during the late Cretaceous in the Western Interior Seaway of North America
- L. Pratt, M. Arthur, W. Dean, P. Scholle
- Geography
- 1993
Isotopic signatures of CH4 and higher hydrocarbon gases from Precambrian Shield sites: A model for abiogenic polymerization of hydrocarbons
- B. Lollar, G. Lacrampe-Couloume, K. Voglesonger, T. Onstott, L. Pratt, G. Slater
- Geology, Environmental Science
- 1 October 2008
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