globalchange  > 过去全球变化的重建
DOI: 10.1016/j.palaeo.2013.06.013
论文题名:
Cenozoic organic carbon isotope and pollen records from the Xining Basin, NE Tibetan Plateau, and their palaeoenvironmental significance
作者: Chi Y.; Fang X.; Song C.; Miao Y.; Teng X.; Han W.; Wu F.; Yang J.
刊名: Palaeogeography, Palaeoclimatology, Palaeoecology
ISSN: 0031-0182
出版年: 2013
卷: 386
起始页码: 436
结束页码: 444
语种: 英语
英文关键词: Cenozoic ; Global temperature ; Monsoon ; Pollen ; Total organic carbon isotope ; Xining Basin
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 ~52Ma and 17Ma). This paper first presents total organic carbon isotope (δ13CTOC) 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 δ13CTOC record shows a long term persistently decreasing trend (from ~-20‰ to -23.5‰) superimposed with obvious cycles of five distinctive phases of heavier and lighter δ13CTOC values, along with short pulses of especially low values occurring at ~32.5Ma, 23Ma, 21.5Ma, and 18Ma. These variations generally correlate with changes of gymnosperm content or the ratio of gymnosperm to angiosperm (G/A); i.e., heavier δ13CTOC 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 δ13CTOC 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. © 2013 .
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资源类型: 期刊论文
标识符: http://119.78.100.158/handle/2HF3EXSE/69656
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作者单位: School of Earth Sciences and oKey Laboratory of Western China's Mineral Resources of Gansu Province, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Continental Collision and Plateau Uplift, Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China; MOE Key Laboratory of Western China's Environmental Systems, Research School of Arid Environment and Climate Change, Lanzhou University, Lanzhou 730000, China; Key Laboratory of Desert and Desertification, Cold and Arid Regions Environmental and Engineering Institute, Chinese Academy of Sciences, Lanzhou 730000, China; Key Laboratory of Salt Lake Resources and Chemistry, Qinghai Institute of Salt Lakes, Chinese Academy of Sciences, Xining 810008, China

Recommended Citation:
Chi Y.,Fang X.,Song C.,et al. Cenozoic organic carbon isotope and pollen records from the Xining Basin, NE Tibetan Plateau, and their palaeoenvironmental significance[J]. Palaeogeography, Palaeoclimatology, Palaeoecology,2013-01-01,386
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