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A much warmer Earth surface for most of geologic time: implications to biotic weatheringThe 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.
Document ID
20040089755
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Schwartzman, D. W.
(Howard University Washington, DC, United States)
McMenamin, M.
Date Acquired
August 21, 2013
Publication Date
January 1, 1993
Publication Information
Publication: Chemical geology
Volume: 107
ISSN: 0009-2541
Subject Category
Meteorology And Climatology
Distribution Limits
Public
Copyright
Other
Keywords
NASA Discipline Exobiology
Non-NASA Center

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