A 25 m.y. isotopic record of paleodiet and environmental change from fossil mammals and paleosols from the NE margin of the Tibetan Plateau

IVPP-IR > 中科院古脊椎所（2000年以后）

	A 25 m.y. isotopic record of paleodiet and environmental change from fossil mammals and paleosols from the NE margin of the Tibetan Plateau
	Wang, Y(王元); Deng, Tao(邓涛); Wang, Y (reprint author), Florida State Univ, Dept Geol Sci, Tallahassee, FL 32306 USA.
	2005
发表期刊	EARTH AND PLANETARY SCIENCE LETTERS
ISSN	0012-821X
卷号	236 期号:41276 页码:322—338
摘要	We use the carbon and oxygen isotopic compositions of fossil tooth enamel and paleosols to reconstruct the late Cenozoic history of vegetation and environmental change in the Linxia Basin at the northeastern margin of the Tibetan Plateau. The delta(13)C values of fossil enamel from a diverse group of herbivores and of paleosol carbonate and organic matter indicate that C4 grasses were either absent or insignificant in the Linxia Basin prior to similar to 2-3 Ma and only became a significant component of local ecosystems in the Quaternary. This is in striking contrast to what was observed in Pakistan, Nepal, Africa and the Americas where C4 plants expanded rapidly in the late Miocene as indicated by a positive delta(13)C shift in mammalian tooth enamel and paleosols. The delta(18)O results from the same herbivore species show several significant shifts in climate in the late Cenozoic. Most notably, a positive delta(18)O shift after similar to 7 Ma indicates a shift to warmer and/or drier conditions and is comparable in timing and direction to the delta(18)O shift observed in paleosol carbonates in Pakistan and Nepal. This late Miocene climate change observed in the Indian sub-continent and in the Linxia Basin, however, seems to be a regional manifestation of a global climate change. The lack of evidence for C4 plants in the Linxia Basin prior to similar to 2-3 Ma suggests that the East Asian summer monsoon, which brings precipitation into northern China during the summer and creates optimal conditions for the growth of C4 grasses, was probably not strong enough to affect this part of China throughout much of the Neogene. This implies that the Himalayan-Tibetan Plateau may not have reached the present-day elevation across its vast extent to support a strong East Asian monsoon system before similar to 2-3 Ma. Our data also suggest that regional climatic conditions played an important role in controlling the expansion of C4 plants. (c) 2005 Elsevier B.V. All rights reserved.
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文献类型	期刊论文
条目标识符	http://119.78.100.205/handle/311034/3533
专题	中科院古脊椎所（2000年以后）古哺乳动物研究室
通讯作者	Wang, Y (reprint author), Florida State Univ, Dept Geol Sci, Tallahassee, FL 32306 USA.
推荐引用方式 GB/T 7714	Wang, Y,Deng, Tao,Wang, Y . A 25 m.y. isotopic record of paleodiet and environmental change from fossil mammals and paleosols from the NE margin of the Tibetan Plateau[J]. EARTH AND PLANETARY SCIENCE LETTERS,2005,236(41276):322—338.
APA	Wang, Y,Deng, Tao,&Wang, Y .(2005).A 25 m.y. isotopic record of paleodiet and environmental change from fossil mammals and paleosols from the NE margin of the Tibetan Plateau.EARTH AND PLANETARY SCIENCE LETTERS,236(41276),322—338.
MLA	Wang, Y,et al."A 25 m.y. isotopic record of paleodiet and environmental change from fossil mammals and paleosols from the NE margin of the Tibetan Plateau".EARTH AND PLANETARY SCIENCE LETTERS 236.41276(2005):322—338.

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