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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >Equatorial Convergence Of India And Early Cenozoic Climate Trends
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Equatorial Convergence Of India And Early Cenozoic Climate Trends

机译：印度的赤道收敛与早期新生代气候趋势

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摘要

India's northward flight and collision with Asia was a major driver of global tectonics in the Cenozoic and, we argue, of atmospheric CO_2 concentration (pCO_2) and thus global climate. Subduction of Tethyan oceanic crust with a carpet of carbonate-rich pelagic sediments deposited during transit beneath the high-productivity equatorial belt resulted in a component flux of CO_2 delivery to the atmosphere capable to maintain high pCO_2 levels and warm climate conditions until the decarbonation factory shut down with the collision of Greater India with Asia at the Early Eocene climatic optimum at 50 Ma. At about this time, the India continent and the highly weatherable Deccan Traps drifted into the equatorial humid belt where uptake of CO_2 by efficient silicate weathering further perturbed the delicate equilibrium between CO_2 input to and removal from the atmosphere toward progressively lower pCO_2 levels, thus marking the onset of a cooling trend over the Middle and Late Eocene that some suggest triggered the rapid expansion of Antarctic ice sheets at around the Eocene-Oligocene boundary.
机译：印度的向北飞行和与亚洲的碰撞是新生代全球构造的主要驱动力，并且我们认为是大气CO_2浓度（pCO_2）以及全球气候的主要驱动力。特提斯洋壳被高生产力赤道带下方运输过程中沉积的富含碳酸盐岩的远洋沉积物的地毯俯冲，导致向大气中释放的CO_2组分通量能够保持较高的pCO_2水平和温暖的气候条件，直到脱碳工厂关闭在大始新世气候最佳50 Ma时，大印度与亚洲相撞。大约在这个时候，印度大陆和高度耐候的Deccan陷阱漂入赤道湿润带，在那里有效的硅酸盐风化对CO_2的吸收进一步扰乱了向大气中输入的CO_2和从大气中去除CO_2之间的微妙平衡，从而使pCO_2水平逐渐降低。有人认为，始新世中期和晚期出现了降温趋势，引发了始新世-渐新世边界附近南极冰盖的迅速膨胀。

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