Paleosol carbonate multiple isotopologue signature of active East Asian summer monsoons during the late Miocene and Pliocene
Suarez, Marina B. ， Passey, Benjamin H. ， Kaakinen, Anu
2011-12-01 GEOLOGY 2011 39(卷), 12(期), (1151-1154页)
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East Asian summer monsoon precipitation has a globally unique delta O-18 signature characterized by low delta O-18 values related to the precipitation "amount effect". We explore the history of this signature using carbonate clumped-isotope thermometry and delta O-18 of paleosol carbonates from northern China. We find that soil water delta O-18 throughout the late Miocene and Pliocene was indistinguishable from present-day summer meteoric water delta O-18. Additionally, soil temperatures were similar to present-day summer temperatures, as were latitudinal gradients in temperature. Paleosol carbonate delta C-13 values document a pattern of northward-increasing C-4 vegetation during 7-3 Ma, interpreted as marking a paleobiome transition from forest to steppe. The present-day summer monsoons give rise to a similar transition owing to latitudinal gradients in precipitation amount and seasonal duration. Taken together, these lines of evidence point to active East Asian summer monsoons during the warm climates of the late Miocene and Pliocene.
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