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首页> 外文期刊>Journal of Asian earth sciences >Late-Miocene palaeoecological evolution of the Tianshui Basin, NE Tibetan Plateau: Evidence from stable organic carbon isotope record
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Late-Miocene palaeoecological evolution of the Tianshui Basin, NE Tibetan Plateau: Evidence from stable organic carbon isotope record

机译：青藏高原东北部天水盆地中新世晚期中古生态演化：来自稳定有机碳同位素记录的证据

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摘要

The spatial and temporal variations and the driving mechanisms of C_3/C_4 vegetation evolution throughout the Miocene have been a matter of long-standing debate. A continuous lacustrine-fluvial sediment sequence widely exposed in the Tianshui Basin, NE Tibetan Plateau provides great potential for deciphering the C3/C4 vegetation dynamics during the Miocene. Based on the measurements of δ~(13)C_(org), C., N, and C/N ratios of organic matter of this sediment sequence, here we present a new perspective on vegetation history in inland Asia during the period from 17.1 to 6.1 Ma. The organic matter preserved in the Tianshui Basin is most likely a mixture of terrestrial and aquatic origins. The lack of correlation between organic δ~(13)C_(org) and carbonate δ~(13)C_(carb) indicates that terrestrial plants made a dominant contribution to the organic matter. The δ~(13)C_(org) of organic matter shows negative values (between -24.1‰ and -28.3‰) along the sequence from 17.1 to 6.1 Ma, indicating a predominance of C_3 plants. More specifically, our results indicate that the δ~(13)C_(org) values of organic matter show a significant increase by ca. 1.4‰ from -26.6‰ to -25.2‰ from 7.1 Ma onwards (equivalent to ca. 10% increase in C_4 plants), reflecting the initial occurrence of C_4 plants. The occurrence and expansion of the C_4 component in the study area is supposed to be a result of increasing summer precipitation due to the enhanced Asian Summer Monsoon since that time.
机译：整个中新世C_3 / C_4植被演化的时空变化和驱动机制一直是一个长期争论的问题。青藏高原东北部在天水盆地广泛暴露的连续的湖相-河流相沉积序列为中新世期间的C3 / C4植被动态研究提供了巨大的潜力。基于该沉积序列有机质的δ〜（13）C_（org），C.，N和C / N比的测量结果，这里我们对17。1年以来亚洲内陆的植被历史提出了新的观点。到6.1 Ma天水盆地保存的有机物很可能是陆源和水源的混合物。有机δ〜（13）C_（org）与碳酸盐δ〜（13）C_（carb）之间缺乏相关性，表明陆生植物对有机质起主要作用。有机质的δ〜（13）C_（org）沿从17.1Ma到6.1Ma的序列显示负值（在-24.1‰和-28.3‰之间），表明C_3植物占优势。更具体地说，我们的结果表明，有机物的δ〜（13）C_（org）值显示出显着的增加。从7.1 Ma开始从-26.6‰到-25.2‰从1.4‰（相当于C_4植物增加约10％），反映了C_4植物的初始出现。自那时以来，由于亚洲夏季风增强，C_4组分在研究区的发生和扩展被认为是夏季降水增加的结果。

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  • 来源
    《Journal of Asian earth sciences》 |2015年第2期|296-303|共8页
  • 作者

    Zhanfang Hou; Jijun Li; Chunhui Song; Jingjing Meng; Jun Zhang;

  • 作者单位

    College of Environment and Planning, Liaocheng University, Liaocheng 252000, PR China,MOE Key Laboratory of Western China's Environmental Systems and College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China;

    MOE Key Laboratory of Western China's Environmental Systems and College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China,College of Geographical Sciences, Nanjing Normal University, Nanjing 210097, PR China;

    School of Earth Sciences and MOE Key Laboratory of Western China's Environmental Systems, Lanzhou University, Lanzhou 730000, PR China;

    College of Environment and Planning, Liaocheng University, Liaocheng 252000, PR China;

    MOE Key Laboratory of Western China's Environmental Systems and College of Earth and Environmental Sciences, Lanzhou University, Lanzhou 730000, PR China;

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  • 正文语种 eng
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  • 关键词

    Stable carbon isotope; Palaeoecology; Tianshui Basin; Tibetan Plateau; Late Miocene;

    机译：稳定的碳同位素;古生态学天水盆地青藏高原中新世晚期;

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