| Paleoenvironmental records from the northern South China Sea since the Last Glacial Maximum |
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| 作者姓名： | GE Qian CHU Fengyou XUE Zuo LIU J Paul DU Yuansheng FANG Yinxia |
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| 作者单位： | GE Qian(Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;Key Laboratory of Submarine Geosciences, State Ocean Administration, Hangzhou 310012, China);CHU Fengyou,FANG Yinxia(Key Laboratory of Submarine Geosciences, State Ocean Administration, Hangzhou 310012, China);XUE Zuo,LIU J Paul(Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, USA);DU Yuansheng(Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China) |
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| 基金项目： | The National Basic Research Program of China under contract No. 2007CB411704. |
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| 摘 要： | Core ZHS-176 contains the paleoenvironmental records from the northern South China Sea (NSCS) since the Last Glacial Maximum (LGM). A coupled approach based on clay mineral assemblages, planktonic foraminiferal oxygen and carbon isotopes, and calcium carbonate content is used to trace the sources of the fine-grained sediment and to investigate the paleoenviornmental evolution in this area. Clay mineral assemblages are dominated by illite (average about 39%) and chlorite (about 27%), which comes mainly from Taiwan and the East China Sea. Kaolinite, which accounts for about 13%, comes mainly from the Zhujiang (Pearl) River, and Luzon Island is the main source for smectite (about 21%). The planktonic foraminiferal oxygen isotopic oscillations during the last glacial period are coeval with climate variations recorded in the Greenland ice core and Western Pacific sediment. These variations include the LGM, Heinrich event 1, Bφlling-Allerφd (B/A), and Younger Dryas. For the Holocene, three periods of strong precipitation (S1-S3) and three periods of weak precipitation (W1-W3) are identified. The oxygen isotopic record exhibits corre-lation with climate records from distant regions, including the high-latitude Northern Hemisphere, providing evidence for global tele-connection among regional climate. A brief, negative planktonic foraminiferal carbon isotopic excursion during B/A reflects increased methane released from marine gas hydrate due to the rapid warming of the water. By comparing calcium carbonate content curves of the core ZHS-176 with these of other five boreholes lying above the lysocline, a remarkable low calcium carbonate event is found during the early Holocene in NSCS.
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| 关 键 词： | 末次冰期 环境记录 南海北部 Sea 中国 |
| 收稿时间： | 2009/9/21 0:00:00 |
| 修稿时间： | 3/5/2010 12:00:00 AM |
Paleoenvironmental records from the northern South China Sea since the Last Glacial Maximum |
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| GE Qian,CHU Fengyou,XUE Zuo,LIU J Paul,DU Yuansheng,FANG Yinxia.Paleoenvironmental records from the northern South China Sea since the Last Glacial Maximum[J].Acta Oceanologica Sinica,2010,29(3):46-62. |
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| Authors: | GE Qian CHU Fengyou XUE Zuo LIU J Paul DU Yuansheng and FANG Yinxia |
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| Institution: | 1.Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China;Key Laboratory of Submarine Geosciences, State Ocean Administration, Hangzhou 310012, China2.Key Laboratory of Submarine Geosciences, State Ocean Administration, Hangzhou 310012, China3.Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, USA4.Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China |
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| Abstract: | Core ZHS-176 contains the paleoenvironmental records from the northern South China Sea (NSCS) since the Last Glacial Maximum (LGM). A coupled approach based on clay mineral assemblages, planktonic foraminiferal oxygen and carbon isotopes, and calcium carbonate content is used to trace the sources of the fine-grained sediment and to investigate the paleoenviornmental evolution in this area. Clay mineral assemblages are dominated by illite (average about 39%) and chlorite (about 27%), which comes mainly from Taiwan and the East China Sea. Kaolinite, which accounts for about 13%, comes mainly from the Zhujiang (Pearl) River, and Luzon Island is the main source for smectite (about 21%). The planktonic foraminiferal oxygen isotopic oscillations during the last glacial period are coeval with climate variations recorded in the Greenland ice core and Western Pacific sediment. These variations include the LGM, Heinrich event 1, Bølling-Allerød (B/A), and Younger Dryas. For the Holocene, three periods of strong precipitation (S1-S3) and three periods of weak precipitation (W1-W3) are identified. The oxygen isotopic record exhibits correlation with climate records from distant regions, including the high-latitude Northern Hemisphere, providing evidence for global tele-connection among regional climate. A brief, negative planktonic foraminiferal carbon isotopic excursion during B/A reflects increased methane released from marine gas hydrate due to the rapid warming of the water. By comparing calcium carbonate content curves of the core ZHS-176 with these of other five boreholes lying above the lysocline, a remarkable low calcium carbonate event is found during the early Holocene in NSCS. |
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| Keywords: | clay mineral oxygen and carbon isotopes calcium carbonate content South China Sea paleoenvironmental evolution |
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