Clay mineral assemblages in the Zhaotong Basin of southwestern China: Implications for the late Miocene and Pliocene evolution of the South Asian monsoon
Clay mineral assemblages in the Zhaotong Basin of southwestern China: Implications for the late Miocene and Pliocene evolution of the South Asian monsoon
复制标题
中国西南昭通盆地粘土矿物组合：对南亚季风晚中新世和上新世演化的启示
DOI：
10.1016/j.palaeo.2018.11.039
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发表时间：
2019-02
期刊：
影响因子：
--
通讯作者：
Zhu Rixiang
中科院分区：
文献类型：
--
作者：
Li Pei;Zhang Chunxia;Guo Zhengtang;Deng Chenglong;Ji Xueping;Jablonski Nina G;Wu Haibin;Zhu Rixiang
晚中新世至上新世南亚季风的演化特征一直存在争议。为了更好地了解青藏高原东南缘昭通盆地的粘土矿物组合和粘土组分含量，我们研究了一个跨越8.8-2.62 Ma的优质沉积序列（钻孔ZK 1）。蒙皂石，高岭石，伊利石和蛭石是四个主要的粘土矿物确定，其相对丰度的变化揭示了一个独特的气候变化模式在研究期间。~6.2 ~ 2.8Ma以蒙皂石为主，少量高岭石和伊利石，气候相对凉爽湿润; 2.8 ~ 2.62Ma以蛭石（HIV）和伊利石为主，少量高岭石，气候相对寒冷潮湿。粘土矿物组合的变化表明昭通盆地南亚季风的显著变化，促使该盆地从晚中新世的暖湿气候向晚中新世至上新世的冷湿气候转变，并在上新世晚逐渐向冷湿气候转变。与其他地区的记录比较表明，南亚季风的变化主要受全球变冷的控制，而不是受青藏高原隆升的控制。
The characteristics of the evolution of the South Asian monsoon during the late Miocene through the Pliocene are highly debated. To obtain a better understanding, we studied the clay mineral assemblages and the clay fraction content of a high-quality sedimentary sequence (borehole core ZK1) spanning the interval of 8.8–2.62 Ma in the Zhaotong Basin, southwestern Yunnan Province, on the southeastern margin of the Tibetan Plateau. Smectite, kaolinite, illite and vermiculite were the four main clay minerals identified, and changes in their relative abundance reveal a distinct pattern of climate change during the study interval. Until the very late Miocene kaolinite and smectite, with a small amount of illite, were dominant, suggesting a relatively warm and humid climate; from ~6.2 to ~2.8 Ma smectite was dominant, with a minor amount of kaolinite and illite, indicating a relatively cool and humid climate; and from ~2.8 to 2.62 Ma vermiculite (HIV) and illite were dominant, with a minor amount of kaolinite, indicating a relatively cold and humid climate. The variation in clay mineral assemblages indicate substantial changes in the South Asian monsoon in the Zhaotong Basin that promoted a change from a warm and humid climate in the late Micoene to cool and humid climate in the very late Miocene through Pliocene, followed by a gradual trend towards a cold and humid climate in the very late Pliocene. Comparison with records from elsewhere indicates that the observed variations in the South Asian monsoon were mainly controlled by global cooling rather than by Tibetan Plateau uplift.
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云南六河地区晚中新世植被与气候
影响因子：
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作者：
通讯作者：
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DOI：
10.1016/j.palaeo.2015.06.007
发表时间：
2015-10
期刊：
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DOI：
10.1016/j.palaeo.2014.06.031
发表时间：
2014-10
期刊：
Palaeogeography, Palaeoclimatology, Palaeoecology
影响因子：
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作者：
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DOI：
10.1016/s0031-0182(00)00149-8
发表时间：
2000-11-15
影响因子：
3
作者：
Hoorn, C;Ohja, T;Quade, J
通讯作者：
Quade, J