Cenozoic organic carbon isotope and pollen records from the Xining Basin, NE Tibetan Plateau, and their palaeoenvironmental significance

ISL OpenIR > 青海盐湖研究所知识仓储

	Cenozoic organic carbon isotope and pollen records from the Xining Basin, NE Tibetan Plateau, and their palaeoenvironmental significance
	Chi, Yunping 1,2,4,5; Fang, Xiaomin 1,2,3,4,5; Song, Chunhui 1,2,4,5; Miao, Yunfa 6; Teng, Xiaohua 4,5; Han, Wenxia 7; Wu, Fuli 3; Yang, Jiwei 1,2
	2013-09-15
发表期刊	PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY
卷号	386 页码:436-444
关键词	Total Organic Carbon Isotope Pollen Xining Basin Cenozoic Global Temperature Monsoon
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.
语种	英语
引用统计
文献类型	期刊论文
条目标识符	http://ir.isl.ac.cn/handle/363002/4426
专题	青海盐湖研究所知识仓储
作者单位	1.Lanzhou Univ, Sch Earth Sci, Lanzhou 730000, Peoples R China 2.Lanzhou Univ, Key Lab Western Chinas Mineral Resources Gansu Pr, Lanzhou 730000, Peoples R China 3.Chinese Acad Sci, Inst Tibetan Plateau Res, Key Lab Continental Collis & Plateau Uplift, Beijing 100101, Peoples R China 4.Lanzhou Univ, MOE Key Lab Western Chinas Environm Syst, Lanzhou 730000, Peoples R China 5.Lanzhou Univ, Res Sch Arid Environm & Climate Change, Lanzhou 730000, Peoples R China 6.Chinese Acad Sci, Cold & Arid Reg Environm & Engn Inst, Key Lab Desert & Desertificat, Lanzhou 730000, Peoples R China 7.Chinese Acad Sci, Qinghai Inst Salt Lakes, Key Lab Salt Lake Resources & Chem, Xining 810008, Peoples R China
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]. PALAEOGEOGRAPHY PALAEOCLIMATOLOGY PALAEOECOLOGY,2013,386:436-444.
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,386,436-444.
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):436-444.