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南海西部越南岸外晚第四纪黏土矿物记录:物源分析与东亚季风演化 被引量:41

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摘要 南海西部越南岸外MD05-2901孔晚第四纪450ka以来黏土矿物和氧同位素的高分辨率分析表明,伊利石、绿泥石和高岭石含量表现出明显的冰期-间冰期旋回变化,而蒙脱石含量呈现频率更高的周期性变化.物源分析表明,MD05-2901孔黏土矿物中的蒙脱石主要由巽他陆架及其主要源区印度尼西亚岛弧提供,伊利石和绿泥石主要由湄公河和红河提供,而高岭石则主要由珠江提供.高岭石/(伊利石+绿泥石)比值的变化显示强烈的100ka偏心率周期,指示了冰盖驱动的冬季风演化;而蒙脱石含量的高频变化除了具有冰盖驱动的41ka斜率周期以外,还具有23和19ka岁差周期、以及13ka半岁差周期,指示了热带驱动的夏季风演化.东亚冬季风的演化基本上与冰期-间冰期旋回一致,冰期时强盛,间冰期时明显减弱;而夏季风的演化则与北半球低纬夏季日射量吻合较好,日射量高时强盛,低时减弱.研究认为,高纬冰盖和低纬热带分别驱动了晚第四纪东亚冬季风和夏季风的演化,反映了东亚季风演化的双重和独立的驱动机制.
出处 《中国科学(D辑)》 CSCD 北大核心 2007年第9期1176-1184,共9页 Science in China(Series D)
基金 国家重点基础研究发展计划(编号:2007CB815906) 国家自然科学基金(批准号:40321603 40331002) 霍英东教育基金(批准号:101018) 高等学校博士学科点专项科研基金(批准号:20060247032) 中荷科学联盟项目(批准号:2004CB720506) 教育部新世纪优秀人才支持计划(批准号:NCET-04-0372)资助
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