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A much warmer Earth surface for most of geologic time: implications to biotic weathering (1993)

Schwartzman, D. W. ; McMenamin, M.

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Publication Date: 2011-08-24

Description: The authors present two scenarios for the temperature history of Earth. One scenario is conventional, the other relies on a warmer history. Both scenarios include surface cooling determined by the evolution of the biosphere and are similar until the Proterozoic period. The warmer scenario requires a higher plant/lichen terrestrial biota to increase weathering intensity. Justification for a warmer surface includes period temperatures from the oxygen isotope record of coexisting phosphates and cherts, an upper limit of 58 degrees C from primary gypsum precipitation, and the lack of fractionation of sulfur isotopes between sulfide and sulfates in Archean sediments.

Keywords: Meteorology and Climatology

Type: Chemical geology (ISSN 0009-2541); Volume 107; 221-3

Format: text

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