南海沉积物中的黏土矿物:指示东亚季风演化历史?  

Clay Mineral Assemblages in Sediments of the South China Sea:East Asian Monsoon Evolution Proxies?

作　　者：刘志飞[1] 

机构地区：[1]同济大学海洋地质国家重点实验室,上海200092

出　　处：《沉积学报》2010年第5期1012-1019,共8页Acta Sedimentologica Sinica

基　　金：国家自然科学基金项目(批准号:40925008;40876024;40776027);国家重点基础研究发展计划(973计划)(批准号:2007CB815906);上海市曙光人才计划(批准号:07SG23);上海市优秀学科带头人计划(批准号:10XD1406300)联合资助

摘　　要：黏土矿物以其示踪洋流变化和揭示物源区同时期气候变化的能力,近年来在南海沉积古环境研究中的地位日益显现。但是,南海黏土矿物能否用于直接指示东亚季风演化历史的研究仍然颇为争议。本研究认为,南海黏土矿物主要受控于物源区供给和洋流搬运作用,黏土矿物本身不具同时期气候条件特征。以南海北部为例,珠江、台湾和吕宋岛这三个主要物源区无论是冰期还是间冰期都提供相同的黏土矿物组合,这些黏土矿物在输入到南海后分别受到不同洋流的搬运。因此,南海晚第四纪黏土矿物组合用于指示东亚季风演化历史的应用是通过洋流的搬运作用来实现的,在不同海区的应用效果不同。Clay minerals can be used to track oceanic current variations and to reveal contemporaneous paleoclimatic changes prevailing in continental source areas,and have played a significant role in sedimentation and paleoenvironment studies of the South China Sea.However,it is quite debatable whether clay minerals in the South China Sea can directly indicate the East Asian monsoon evolution.This study reports that the clay mineral assemblage in the South China Sea is mainly controlled by provenance supply and current transport,and that the clay minerals themselves do not bear the contemporaneous paleoclimatic characteristics.For example,as three major provenances of terrigenous clastics,the Pearl River,Taiwan,and Luzon provide similar the clay mineral assemblages,respectively,regardless of glacial or interglacial stages.Once entering the South China Sea,these clay minerals are transported by different oceanic currents.Therefore,the implication of late Quaternary clay mineral assemblages in the South China Sea for proxies of the East Asian monsoon evolution is realized through the current transport processes with various results in different parts of the South China Sea.

关 键 词：黏土矿物 东亚季风 物源区 洋流 晚第四纪 南海 

分 类 号：P512.2[天文地球—地质学]