| GE Qian,CHU Fengyou,XUE Zuo,LIU J Paul,DU Yuansheng,FANG Yinxia. 2010. Paleoenvironmental records from the northern South China Sea since the Last Glacial Maximum. Acta Oceanologica Sinica, (3):46－62 |
| Paleoenvironmental records from the northern South China Sea since the Last Glacial Maximum |
| Paleoenvironmental records from the northern South China Sea since the Last Glacial Maximum |
| Received:September 21, 2009 Revised:March 05, 2010 |
| DOI：10.1007/s13131-010-0036-9 |
| Key words:clay mineral oxygen and carbon isotopes calcium carbonate content South China Sea paleoenvironmental evolution |
| 中文关键词: clay mineral oxygen and carbon isotopes calcium carbonate content South China Sea paleoenvironmental evolution |
| 基金项目:The National Basic Research Program of China under contract No. 2007CB411704. |
| Author Name | Affiliation | E-mail | | GE Qian | Faculty of Earth Sciences, China University of Geosciences, Wuhan 430074, China
Key Laboratory of Submarine Geosciences, State Ocean Administration, Hangzhou 310012, China | gq980447@hotmail.com | | CHU Fengyou | Key Laboratory of Submarine Geosciences, State Ocean Administration, Hangzhou 310012, China | | | XUE Zuo | Department of Marine, Earth and Atmospheric Sciences, North Carolina State University, Raleigh, NC 27695, USA | | | 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 | | | FANG Yinxia | Key Laboratory of Submarine Geosciences, State Ocean Administration, Hangzhou 310012, 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, 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 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. |
| 中文摘要: |
| 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 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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