| The Combined Effect of Tibetan Plateau Uplift and Glacial-Interglacial Cycles on the Quaternary Evolution of the East Asian Monsoon: Evidence from South China Sea Sediments |
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| 作者姓名： | MENG Xianwei LIU Yanguang ZHANG Xiaodong and ZHANG Jun |
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| 作者单位： | 1 First Institute of Oceanography, State Oceanic Administration, Qingdao 266063, Shandong, China
2 Ocean University of China, Qingdao 266100, Shandong, China |
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| 基金项目： | Funding for this research was provided by the National Natural Science Foundation of China (NSFC), grant number 40576034. |
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| 摘 要： | The siliciclastic sediments of the uppermost section of 185 mcd(meters composite depth) from ODP Site 1146 on the northern continental slope of the South China Sea(SCS) were partitioned according to their sources using end-member modeling on grain-size data. The goal was to evaluate the evolution of the East Asian monsoon over the past 2 million years. The siliciclastic sediments were described as hybrids of four end-members, EM1, EM2, EM3, and EM4, with modal grain sizes of 8–22 μm, 2–8 μm, 31–125 μm, and 4–11 μm, respectively. EM1 and EM3 are interpreted as eolian dust and EM2 and EM4 as fluvial mud. The ratio of eolian dust to fluvial mud((EM1+EM3)/(EM2+EM4)) is regarded as an indicator of the East Asian monsoon. The variation in this ratio not only shows periodical oscillations consistent with oxygen isotope stages, but also exhibits a phased increasing trend corresponding with the phased uplifts of the Tibetan Plateau, indicating that the evolution of the East Asian Monsoon was controlled not only by glacial-interglacial cycles, but also by the phased uplifts of the Tibetan Plateau during the Quaternary.
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| 关 键 词： | 青藏高原隆升 第四纪冰期 碎屑沉积物 东亚季风 中国南海 演化 冰期旋回 证据 |
| 收稿时间： | 2013/11/14 0:00:00 |
| 修稿时间： | 3/1/2014 12:00:00 AM |
The Combined Effect of Tibetan Plateau Uplift and Glacial-Interglacial Cycles on the Quaternary Evolution of the East Asian Monsoon：Evidence from South China Sea Sediments |
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| Authors: | MENG Xianwei LIU Yanguang ZHANG Xiaodong ZHANG Jun |
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| Affiliation: | [1]First Institute of Oceanography, State Oceanic Administration, Qingdao 266063, Shandong, China [2]Ocean University of China, Qingdao 266100, Shandong, China |
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| Abstract: | The siliciclastic sediments of the uppermost section of 185 mcd (meters composite depth) from ODP Site 1146 on the northern continental slope of the South China Sea (SCS) were partitioned according to their sources using end‐member modeling on grain‐size data. The goal was to evaluate the evolution of the East Asian monsoon over the past 2 million years. The siliciclastic sediments were described as hybrids of four end‐members, EM1, EM2, EM3, and EM4, with modal grain sizes of 8–22 μm, 2–8 μm, 31–125 μm, and 4–11 μm, respectively. EM1 and EM3 are interpreted as eolian dust and EM2 and EM4 as fluvial mud. The ratio of eolian dust to fluvial mud ((EM1+EM3)/(EM2+EM4)) is regarded as an indicator of the East Asian monsoon. The variation in this ratio not only shows periodical oscillations consistent with oxygen isotope stages, but also exhibits a phased increasing trend corresponding with the phased uplifts of the Tibetan Plateau, indicating that the evolution of the East Asian Monsoon was controlled not only by glacial‐interglacial cycles, but also by the phased uplifts of the Tibetan Plateau during the Quaternary. |
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| Keywords: | East Asian monsoon South China Sea Tibetan Plateau uplift glacial-interglacial cycle Quaternary |
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