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• W2155658032 abstract "Research Article| June 01, 2004 Geologic evidence for Archean atmospheric and climatic evolution: Fluctuating levels of CO2, CH4, and O2 with an overriding tectonic control Donald R. Lowe; Donald R. Lowe 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115, USA Search for other works by this author on: GSW Google Scholar Michael M. Tice Michael M. Tice 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115, USA Search for other works by this author on: GSW Google Scholar Author and Article Information Donald R. Lowe 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115, USA Michael M. Tice 1Department of Geological and Environmental Sciences, Stanford University, Stanford, California 94305-2115, USA Publisher: Geological Society of America Received: 20 Nov 2003 Revision Received: 18 Feb 2004 Accepted: 20 Feb 2004 First Online: 02 Mar 2017 Online ISSN: 1943-2682 Print ISSN: 0091-7613 Geological Society of America Geology (2004) 32 (6): 493–496. https://doi.org/10.1130/G20342.1 Article history Received: 20 Nov 2003 Revision Received: 18 Feb 2004 Accepted: 20 Feb 2004 First Online: 02 Mar 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Get Permissions Search Site Citation Donald R. Lowe, Michael M. Tice; Geologic evidence for Archean atmospheric and climatic evolution: Fluctuating levels of CO2, CH4, and O2 with an overriding tectonic control. Geology 2004;; 32 (6): 493–496. doi: https://doi.org/10.1130/G20342.1 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGeology Search Advanced Search Abstract The 3.5–3.2 Ga sedimentary record shows evidence of surface temperatures of 70 ± 15 °C, nahcolite (NaHCO3) as a primary evaporitic mineral, and an aggressive weathering regime even in the absence of land vegetation. These features are best explained by a mixed CH4 and CO2 atmospheric greenhouse in which CH4/CO2 ratios were ≪1 and pCO2 was at least 100–1000 times the present value and perhaps as high as several bars. The formation of large areas of continental crust at 3.2–3.0 Ga, including the Kaapvaal and Pilbara cratons, resulted in the gradual depletion of atmospheric CO2 through weathering. By 2.9–2.7 Ga, declining pCO2 was associated with climatic cooling and siderite-free soils. Transitory CH4/CO2 ratios of ∼1 may have resulted in the sporadic formation of organic haze from atmospheric CH4, reflected in one or more isotopic excursions involving global deposition of abnormally 13C-depleted organic C. Surface temperatures of <60 °C after 2.9 Ga may have also increased the distribution and productivity of oxygenic photosynthetic microbes. Eventual lowering of new continental blocks by erosion, reduced loss of atmospheric CO2 due to weathering, and continued long-term tectonic recycling of CO2 resulted in rising pCO2 and decreasing CH4/CO2 ratios in the later Archean and eventual reestablishment of a mainly CO2 greenhouse. Similar events may have been repeated in the latest Archean and earliest Proterozoic, but gradually rising production of O2 effectively kept CH4/CO2 ratios to ≪1 at this time. You do not have access to this content, please speak to your institutional administrator if you feel you should have access." @default.
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• W2155658032 title "Geologic evidence for Archean atmospheric and climatic evolution: Fluctuating levels of CO2, CH4, and O2 with an overriding tectonic control" @default.
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