南极半岛东北部海域碎屑矿物特征与物源分析  

CHARACTERISTICS AND PROVENANCE OF CLASTIC MINERALS IN SURFACE SEDIMENTS IN THE WATERS NORTHEAST OF THE ANTARCTIC PENINSULA

作　　者：刘忠诚[1] 陈志华[2] 金秉福[1] 王昆山[2] 

机构地区：[1]鲁东大学地理与规划学院,山东烟台264025 [2]国家海洋局第一海洋研究所,山东青岛266061

出　　处：《极地研究》2014年第1期139-150,共12页Chinese Journal of Polar Research

基　　金：南北极环境综合考察与评估专项(CHINARE2012-01-02;CHINARE2013-01-02)资助

摘　　要：基于南极半岛东北部海域15个表层碎屑沉积物样品和1个柱状样的碎屑矿物学分析,对该区的沉积环境与物质来源进行了相关分析。结果显示,该区碎屑矿物共有31种,其中,重矿物19种,以石榴子石、紫苏辉石、绿帘石、普通角闪石为主;轻矿物12种,以石英、斜长石、火山玻璃(褐色、无色)为主。根据矿物组合分布特征,研究区可以划分为2个碎屑物沉积区:Ⅰ区为辉石-磁铁矿-火山玻璃型,主要物质来源为南设得兰群岛及南极半岛北段火山岩与火山喷发物,冰川为其主要搬运介质和动力来源;Ⅱ区为石榴子石-绿帘石-角闪石-石英型,南奥克尼群岛物质、南极绕极环流搬运南极半岛及其附近岛屿的物质对该区沉积物均有贡献。The depositional environment and sedimentary provenance were studied in the sea to the northeast of the Antarctic Peninsula based on mineralogical analysis of 15 surface sediment samples and a core sample. Thirty-one types of minerals were recognized in this study, including 19 species of heavy mineral and 12 species of light mineral. Garnet, hypersthene, amphibole and epidote are the dominant heavy minerals, and quartz, plagioclase and volcanic glass （brown and white） are the main light mineral species. From the distribution of the mineral assemblages, two mineral provinces can be identified. Province I is of the pyroxene-magnetite-volcanic glass type and province 11 is of the garnet-epidote-amphibole-quartz type. The volcanic rocks and volcanic eruptions of the South Shetland Islands and the northern part of the Antarctic Peninsula, which have been transported by glacial process, are the main source of province I. Detrital materials from the local area of the South Orkney Islands and the Antarctic Peninsula and adjacent islands carried by the Antarctic Circumpolar Current are the main source for province II.

关 键 词：碎屑矿物 物质来源 南极半岛东北海域 

分 类 号：P736.3[天文地球—海洋地质]