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DOI	10.1016/j.palaeo.2013.06.013
	Cenozoic organic carbon isotope and pollen records from the Xining Basin, NE Tibetan Plateau, and their palaeoenvironmental significance
	Chi, Yunping; Fang, Xiaomin; Song, Chunhui; Miao, Yunfa; Teng, Xiaohua; Han, Wenxia; Wu, Fuli; Yang, Jiwei
通讯作者	Fang, XM (通讯作者)
发表日期	2013
ISSN	0031-0182
EISSN	1872-616X
起始页码	436
结束页码	444
卷号	386
英文摘要	Marine oxygen isotope records show that the Cenozoic global climate has undergone remarkable fundamental changes. However, how terrestrial ecosystems respond to these changes remains unclear. The Xining Basin on the northeastern Tibetan Plateau holds continuous fine fluvial-lacustrine sediments from the early Eocene to the early Miocene (between similar to 52 Ma and 17 Ma). This paper first presents total organic carbon isotope (delta C-13(TOC)) and pollen records from the Xiejia section in the Xining Basin, as indicators of the long-term terrestrial paleoecosystem and paleoclimate changes in the Asian interior of NW China. The delta C-13(TOC) record shows a long term persistently decreasing trend (from similar to-20 parts per thousand to -23.5 parts per thousand) superimposed with obvious cycles of five distinctive phases of heavier and lighter delta C-13(TOC) values, along with short pulses of especially low values occurring at similar to 32.5 Ma, 23 Ma, 21.5 Ma, and 18 Ma. These variations generally correlate with changes of gymnosperm content or the ratio of gymnosperm to angiosperm (G/A); i.e., heavier delta C-13(TOC) values correspond with higher gymnosperm content or higher G/A, as well as with global temperatures (for both long term trends and shorter term fluctuations). We propose that global temperatures might provide the major factor controlling the evolution of the gymnosperm content (and the G/A ratio) that determines the delta C-13(TOC) in the sediments. The East Asian monsoon may not have reached this region during the deposition of the sediments, or alternatively, its signals could not clearly be identified in these low resolution paleoecologic records. (C) 2013 Published by Elsevier B.V.
关键词	MIOCENE MAMMALIAN FOSSILS C-13/C-12 RATIOS CLIMATE-CHANGE TERRESTRIAL ECOSYSTEM TEMPORAL VARIATIONS RAINFALL GRADIENT DOMINANT CONTROL PLANT ABUNDANCE LOESS PLATEAU UPLIFT
英文关键词	Total organic carbon isotope; Pollen; Xining Basin; Cenozoic; Global temperature; Monsoon
语种	英语
WOS研究方向	Physical Geography ; Geology ; Paleontology
WOS类目	Geography, Physical ; Geosciences, Multidisciplinary ; Paleontology
WOS记录号	WOS:000324848800033
来源期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
来源机构	中国科学院青藏高原研究所
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/258160
推荐引用方式 GB/T 7714	Chi, Yunping,Fang, Xiaomin,Song, Chunhui,et al. Cenozoic organic carbon isotope and pollen records from the Xining Basin, NE Tibetan Plateau, and their palaeoenvironmental significance[J]. 中国科学院青藏高原研究所,2013,386.
APA	Chi, Yunping.,Fang, Xiaomin.,Song, Chunhui.,Miao, Yunfa.,Teng, Xiaohua.,...&Yang, Jiwei.(2013).Cenozoic organic carbon isotope and pollen records from the Xining Basin, NE Tibetan Plateau, and their palaeoenvironmental significance.PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,386.
MLA	Chi, Yunping,et al."Cenozoic organic carbon isotope and pollen records from the Xining Basin, NE Tibetan Plateau, and their palaeoenvironmental significance".PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY 386(2013).