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地球科学进展  2007, Vol. 22 Issue (10): 1012-1018    DOI: 10.11867/j.issn.1001-8166.2007.10.1012
IODP研究     
南海东北部MD05-2905站36 ka BP以来的陆源碎屑沉积特征与东亚季风的演化
杨文光,郑洪波,王可,谢昕,陈国成,梅西
同济大学海洋地质国家重点实验室,上海 200092
Sedimentary Characteristic of Terrigenous Clast of Site MD05-2905 in the Northeastern Part of South China 
YANG Wen-guang, ZHENG Hong-bo, WANG Ke,XIE Xin, CHEN Guo-cheng,MEI Xi
State Key Laboratory of Marine Geology, Tongji University, Shanghai 200092, China
 全文: PDF(291 KB)  
摘要:

在AMS14C精确定年的基础上,去除有机质、生物碳酸盐和生物硅之后,对南海北部MD052905站进行了陆源碎屑的粒度分析。结果显示,15.5~63.5 μm粗粒级成分的含量变化特征可用来指示东亚冬季风的变化,2~9 μm细粒级成分含量变化可用于指示东亚夏季风的变化。末次冰期以冬季风为主,全新世以夏季风为主,36 ka BP以来东亚夏季风有逐渐增强的总体趋势,但也发生多次突变现象,在全新世早期(8 500~11 200 ka BP)达到36ka BP以来的最大值,可能是在岁差周期的控制下,与较强的太阳辐射有关。

关键词: 粒度全新世MD052905陆源碎屑南海东亚季风    
Abstract:

Sediments with high sedimentation rate at Site MD05-2905 in the northern part of the South China Sea provide unique materials for a high-resolution study on paleoenvironment. Based on precision dating of AMS14C, grain size analysis of terrigenous clast at Site MD05-2905 is studied after removing organic matter, biological carbonate and biogenic opal. The results show that 15.5~63.5μm, coarse grain size ingredients,may indicate the East Asian winter monsoon changes. And that 2 ~ 9μm,fine grain size ingredients,may be used as a proxy of evolution of the East Asian summer monsoon. The results of grain size analysis, which suggest the East Asian monsoon intensity, revealed that a winter monsoon dominated glacial regime and a summer monsoon dominated Holocene regime, and that the summer monsoon increased gradually,experienced several abrupt change events and reached to the culmination in the early Holocene(8 500~11 200 ka BP) after 36 ka. This, with control by precession periodicity, may be related with the amount of solar radiation at the highest stage which needs further study.

Key words: Terrigenous clast    Grain size analysis    East Asian Monsoon    Holocene    South China Sea    MD05-2905.
收稿日期: 2007-09-02 出版日期: 2007-10-10
:  P736.21+3  
基金资助:

国家自然科学基金项目“50万年以来高分辨率地磁场长期变化研究”(编号:40676033);国家自然科学基金国际(地区)合作交流项目“晚第四纪印度洋与南中国海古海洋学对比研究”(编号:40710099);科技部“中荷科技联盟”项目“末次冰期以来中国环境(气候)条件的多样性”(编号:2004CB720506);国家高技术研究发展计划项目“大洋钻探技术预研究”(编号:2004AA615030)联合资助.

通讯作者: 杨文光(1980-),男,安徽太和人,博士研究生,主要从事海洋沉积学与全球变化研究.E-mail:yangwg_cdut@163.com     E-mail: yangwg_cdut@163.com
作者简介: 杨文光(1980-),男,安徽太和人,博士研究生,主要从事海洋沉积学与全球变化研究.E-mail:yangwg_cdut@163.com
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引用本文:

杨文光,郑洪波,王可,谢昕,陈国成,梅西. 南海东北部MD05-2905站36 ka BP以来的陆源碎屑沉积特征与东亚季风的演化[J]. 地球科学进展, 2007, 22(10): 1012-1018.

YANG Wen-guang, ZHENG Hong-bo, WANG Ke,XIE Xin, CHEN Guo-cheng,MEI Xi. Sedimentary Characteristic of Terrigenous Clast of Site MD05-2905 in the Northeastern Part of South China . Advances in Earth Science, 2007, 22(10): 1012-1018.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2007.10.1012        http://www.adearth.ac.cn/CN/Y2007/V22/I10/1012

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