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地球科学进展  2006, Vol. 21 Issue (8): 800-805    DOI: 10.11867/j.issn.1001-8166.2006.08.0800
IODP研究     
南大西洋渐新世初碳酸盐记录(ODP 1263站)
拓守廷,刘志飞,成鑫荣,赵泉鸿
同济大学海洋地质国家重点实验室,上海 200092
The Earliest Oligocene Carbonate Record in South Atlantic (ODP Site 1263)
Tuo Shouting,Liu Zhifei,Cheng Xinrong,Zhao Quanhong 
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
 全文: PDF(169 KB)  
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。

关键词: 渐新世初期碳酸盐溶解南大西洋ODP 1263站    
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.

Key words: Earliest oligocene    South Atlantic    ODP Site 1263.    Carbonate dissolution
收稿日期: 2006-05-10 出版日期: 2006-08-15
:  P736.21  
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.

通讯作者: 拓守廷     E-mail: tuosht@hotmail.com
作者简介: 拓守廷(1979-),男,宁夏中卫人,博士生,主要从事沉积与古环境研究.E-mail:tuosht@hotmail.com
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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.

Tuo Shouting,Liu Zhifei,Cheng Xinrong,Zhao Quanhong . The Earliest Oligocene Carbonate Record in South Atlantic (ODP Site 1263). Advances in Earth Science, 2006, 21(8): 800-805.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2006.08.0800        http://www.adearth.ac.cn/CN/Y2006/V21/I8/800

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