收稿日期: 2006-05-10
修回日期: 2006-06-10
网络出版日期: 2006-08-15
基金资助
国家自然科学基金项目“南大西洋渐新世初大冰期事件的高分辨率研究”（编号：40446003）；“南海中更新世气候转型期千年尺度气候波动及其全球意义”（编号：40331002）；“西太平洋暖池与东亚古环境：沉积记录的海陆对比”（编号：40321603）；霍英东教育基金会项目“青藏高原东部晚第四纪侵蚀和气候演变在南海中的记录”（编号：101018）；教育部新世纪优秀人才支持计划“早新生代极端气候事件的海陆对比研究”；科技基础性工作和社会公益研究专项“中国综合大洋钻探计划预研究”（编号：2003DIB3J114）资助.
The Earliest Oligocene Carbonate Record in South Atlantic (ODP Site 1263)
Received date: 2006-05-10
Revised date: 2006-06-10
Online published: 2006-08-15
成鑫荣 , 拓守廷 , 赵泉鸿 , 刘志飞 . 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 . DOI: 10.11867/j.issn.1001-8166.2006.08.0800
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.
Key words： Earliest oligocene; South Atlantic; ODP Site 1263.; Carbonate dissolution
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