| 南大西洋渐新世初碳酸盐记录（ODP 1263站） |
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| 引用本文： | 拓守廷,刘志飞,成鑫荣,赵泉鸿.南大西洋渐新世初碳酸盐记录（ODP 1263站）[J].地球科学进展,2006,21(8):800-805. |
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| 作者姓名： | 拓守廷 刘志飞 成鑫荣 赵泉鸿 |
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| 作者单位： | 同济大学海洋地质国家重点实验室,上海,200092 |
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| 基金项目： | 国家自然科学基金;国家自然科学基金;国家自然科学基金;霍英东教育基金;教育部跨世纪优秀人才培养计划;中央级科研院所技术开发研究专项基金 |
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| 摘 要： | 渐新世初期，南极大陆在短时间内出现永久性冰盖，地球由两极无冰进入到单极有冰的特殊时期。越来越多的研究表明，这一重大气候转型事件与大气CO2及大洋碳储库的变化密切相关。南大西洋ODP 1263站碳酸钙软泥的粒度分析揭示了在渐新世初期发生的强烈碳酸盐溶解事件，碳酸盐溶解超前于底栖有孔虫氧同位素重值约100 ka，显示碳酸盐溶解事件先于南极冰盖的形成。由于碳酸钙泵的作用，碳酸盐的溶解会消耗大量的大气CO2，从而可能驱动了气候的快速变冷，导致南极大陆永久性冰盖发育。
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| 关 键 词： | 渐新世初期 碳酸盐溶解 南大西洋 ODP 1263站 |
| 文章编号： | 1001-8166（2006）08-0800-06 |
| 收稿时间： | 2006-05-10 |
| 修稿时间： | 2006-06-10 |
The Earliest Oligocene Carbonate Record in South Atlantic (ODP Site 1263) |
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| Tuo Shou-ting,Liu Zhi-fei,Cheng Xin-rong,Zhao Quan-hong.The Earliest Oligocene Carbonate Record in South Atlantic (ODP Site 1263)[J].Advance in Earth Sciences,2006,21(8):800-805. |
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| Authors: | Tuo Shou-ting Liu Zhi-fei Cheng Xin-rong Zhao Quan-hong |
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| Institution: | State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China |
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| Abstract: | he first continent wide Antarctic ice sheet formed in the earliest Oligocene, during which the Earth underwent a great change from a non glaciated planet to a polar glaciated planet. Recent investigations suggested that the mechanism of this climate transition has a close relationship with variations of ocean carbon reservoir and atmospheric CO2. The grain size variations of the carbonate ooze at ODP Site 1263 in South Atlantic revealed that a very strong carbonate dissolution event happened in the Earliest Oligocene. Leading the heaviest foraminiferal δ18O by 100 ka, the carbonate dissolution event started earlier than formation of the Antarctic ice sheet. The carbonate dissolution consumes lots of atmospheric CO2 and then transports the atmospheric CO2 into deep sea through the function of calcium pump. It could force and speed up the global cooling, and then the permanent ice sheet appeared on the eastern Antarctic. |
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| Keywords: | Earliest oligocene Carbonate dissolution South Atlantic ODP Site 1263 |
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