Metamorphic decarbonation, silicate weathering and the long‐term carbon cycle

Terra Nova - Tập 8 Số 3 - Trang 270-276 - 1996
M. J. Bickle1
1Department of Earth Sciences, University of Cambridge, Downing Street, Cambridge, CB2 3EQ, UK

Tóm tắt

ABSTRACTThe seawater 87Sr/86Sr curve implies a 50–100 Myr episodicity in weathering rate which requires a corresponding variation in CO2 degassing from the solid earth to the atmosphere. It is proposed that this is caused by orogenesis, which both produces CO2 as a result of metamorphic decarbonation reactions, and consumes extra CO2 as a consequence of erosion‐enhanced weathering. Global climate on the geological time‐scale is therefore contTolled by the difference between the relatively large and variable orogenic‐moderated degassing and weathering CO2 fluxes.

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