Evolution of the East Asian monsoon and its response to uplift of the Tibetan Plateau since 1.8 Ma recorded by major elements in sediments of the South China Sea  

作　　者：MENG XianWei XIA Peng ZHENG Jun WANG XiangQin 

机构地区：[1]First Institute of Oceanography, State Oceanic Administration, Qingdao 266061, China [2]Ocean University of China, Qingdao 266100, China

出　　处：《Chinese Science Bulletin》2011年第6期547-551,共5页

基　　金：supported by the National Natural Science Foundation of China (40576034)

摘　　要：东方亚洲季风和它的反应的进化在全球变化的学习被调查了西藏的高原高举。在 ODP Leg184 期间在华南海钻的核心沉积样品是为学习东方亚洲季风的长期的可变性的最好的材料。在好谷物大小的没有碳酸盐的沉积的主要元素的R模式因素分析(< 4 m )上面 185 mcd 地点 1146 在华南海表演在 Leg184 期间钻了的 ODP 拼接那 Ti ， TFe2O3 ， MgO ， K2O ， P ， CaO ，并且 Al2O3 一个陆上的因素是代表性的。在陆上的因素分数的变化在来源区域服从于化学侵蚀并且因此显示东方亚洲夏天季风的进化。陆上的因素分数在 1.3 妈， 0.9 妈，和 0.6 妈有三逐步的减少，显示夏天季风与有关的东方亚洲人变弱分阶段执行完全逐步，自从 1.8 妈，快西藏的高原高举。自从 0.6 妈，陆上的因素分数的周期的变化显示冰川间冰期的周期是驾驶东方亚洲季风的进化的主要力量。作为在中国黄土的情况中，在华南海的沉积记录的东方亚洲季风的长期的进化反映冰川间冰期的周期的 a coupled 效果并且西藏的高原高举。Evolution of the East Asian monsoon and its response to uplift of the Tibetan Plateau has been investigated in the study of global change. Core sediment samples drilled in the South China Sea during ODP Leg184 are the best materials for studying long-term variability of the East Asian monsoon. R-mode factor analysis of major elements in the fine grain-sized carbonate-free sediments （〈4 I.tm） of the upper 185 mcd splice of ODP Site 1146 drilled during Leg184 in the South China Sea shows that Ti, TFe203, MgO, K20, P, CaO, and A1203 are representative of a terrestrial factor. The variation in the terrestrial factor score is subject to chemical erosion in the source region and thus indicates the evolution of the East Asian summer monsoon. The terrestrial factor score has three stepwise decreases at ~1.3 Ma, ~0.9 Ma, and -0.6 Ma, indicating the phased weakening of the East Asian summer monsoon is related to wholly stepwise, quick uplifts of the Tibetan Plateau since 1.8 Ma. The periodic fluctuation of the terrestrial factor score since ~0.6 Ma indicates that the glacial-interglacial cycles have been the main force driving the evolution of the East Asian monsoon. As in the case of Chinese loess, the long-term evolution of the East Asian monsoon recorded in sediments of the South China Sea reflects a coupled effect of the glacial-interglacial cycle and uplift of the Tibetan Plateau.

关 键 词：青藏高原隆升 柱状沉积物 东亚季风 南中国海 演变 R型因子分析 周期性波动 MA 

分 类 号：P542.1[天文地球—构造地质学] P736.41[天文地球—地质学]