PROVINCES AND PROVENANCE OF HEAVY M INERALS IN SURFACE SEDIMENTS OF THE SEA AREA NEAR ZHONGSHA ISLANDS IN SOUTH CHINA SEA
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摘要: 对取自南海中沙群岛附近海域114个表层沉积物样品的重矿物含量、分布特征和矿物组合进行了研究,在此基础上划分出3个矿物组合区:混合矿物区(Ⅰ),矿物组合包括金属矿物、云母类矿物(陆源)、闪石类矿物、辉石类矿物以及铁锰微结核。其中云母类矿物主要来自中国大陆,陆源碎屑垂直等深线向深海搬运,影响区域限于17°N以北,其次自生矿物及火山成因矿物对本区有较大影响;自生矿物区(Ⅱ)。矿物以自生铁锰微结核为主,南海原地海山的风化剥蚀物、原地可能正在活动的小型火山的喷发物质为铁锰微结核的形成提供了物源;火山碎屑矿物区(Ⅲ),矿物以闪石类、辉石类矿物为主,其次为云母类矿物(火山源),在局部地区出现铁锰微结核及金属矿物的高含量区。重矿物分区与轻矿物分区基本一致,但由于重矿物自身密度大.源区主要为原地海山或正在活动的小型火山等特点,因而,在分区过程中表现出一定的差异。Abstract: We identified 114 surface sediment samp es which were collected from the sea area near Zhongsha Islands in South China Sea. Heavy minerals in this study area have been divided into 3 mineral provinces. Mixed mineral province(Ⅰ), mineral assemblages mainly include metal minerals, micas, hornblendes, pyroxene and Fe-Mn micro-nodules. Terrigenous minerals are mainly derived from China's mainland and do not exceed 17°N; and autogenetic minerals and volcanogenic minerals have a great influence on the sedimentation of this sub-zone; autogenetic mineral province(Ⅱ), mineral assemblages are mainly is Fe-Mn micro-nodules, whose material provenances are weathering product of in situ seamount and erupting materials of in-situ ongoing small-scale volcanoes; volcanogenic mineral province (Ⅲ), mineral assemblage mainly include hornblendes, pyroxenes and micas subordinately.
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Key words:
- heavy mineral /
- minerals province /
- material provenance /
- surficial sediment /
- Zhongsha Islands
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