南海西部表层沉积物碎屑矿物分布特征及其物源

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南海西部表层沉积物碎屑矿物分布特征及其物源

李学杰　 汪品先　 廖志良　 陈芳　 霍振海　

摘　要：南海西部海域的物源研究程度相对较低,尤其对中段的物源有较大的争议.通常认为中部没有大河注入,其物源主要来自其南北的湄公河和红河.笔者通过对该区表层沉积物的系统取样及碎屑矿物分析鉴定认为,碎屑矿物主要分布于南部陆架区和中部陆坡区域.根据因子分析,南海西部碎屑矿物可以明显分为南部、中部、北部三区.南区陆架碎屑矿物主要由重矿物金红石、锐钛矿、白钛矿、锆石、透闪石、十字石及轻矿物石英、长石等组成,原岩应以岩浆岩类为主,包括部分变质岩;中区陆坡以十字石、透闪石、电气石、褐铁矿及黑云母、白云母为主,原岩可能主要为变质岩类:北区陆坡碎屑矿物少,组合特征不明显.各区不仅组合特征明显不同,且各区分界明显,表明其物质来源明显不同,南区物源主要来自红河和加里曼丹岛;中部海域的碎屑矿物组合与中南半岛大量出露的变质岩基本吻合,表明其物源主要来自中南半岛,而不是来自其南北的湄公河和红河.
关键词：碎屑矿物;重矿物;沉积作用;物源;南海
分类号：P736.21+1 　文献标识码：A
文章编号：1000-3657(2008)01-0123-08

Distribution of clastic minerals of surface sediments in the western China Sea and their provenance

LI Xue-jie　 WANG Pin-xian　 LIAO Zhi-liang　 CHEN Fang　 HUO Zhen-hai　



基金项目：国家自然科学基金项目(40372005)资助.
作者简介：李学杰,男,1964年生,博士,教授级高级工程师,主要从事海洋地质与第四纪地质工作;E-mail:xuejieli@yeah.net.
作者单位：李学杰（广州海洋地质调查局,广东,广州,510760）　
　　　　　汪品先（同济大学海洋与地球科学学院,上海,200092）　
　　　　　廖志良（广州海洋地质调查局,广东,广州,510760）　
　　　　　陈芳（广州海洋地质调查局,广东,广州,510760）　
　　　　　霍振海（广州海洋地质调查局,广东,广州,510760）　

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