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Geology; December 2003; v. 31; no. 12; p. 1093-1096; DOI: 10.1130/G19992.1
© 2003 Geological Society of America
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Changes in terrestrial ecosystem since 30 Ma in East Asia: Stable isotope evidence from black carbon in the South China Sea

Guodong Jia1, Ping'an Peng1, Quanhong Zhao2 and Zhimin Jian2

1 State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China
2 Laboratory of Marine Geology, Tongji University, Shanghai 200092, China

A 30 m.y. stable isotopic record of marine-deposited black carbon from regional terrestrial biomass burning from the northern South China Sea reveals photosynthetic pathway evolution for terrestrial ecosystems in the late Cenozoic. This record indicates that C3 plants negatively adjusted their isotopic discrimination and C4 plants appeared gradually as a component of land vegetation in East Asia since the early Miocene, a long time before sudden C4 expansion occurred during the late Miocene to the Pliocene. The changes in terrestrial ecosystems with time can be reasonably related to the evolution of East Asian monsoons, which are thought to have been induced by several intricate mechanisms during the late Cenozoic and could contribute significantly to the post-Miocene marine carbonate isotope decline.

Key Words: South China Sea • 13C/12C • paleoecology • monsoon • carbon cycle






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