Characteristics and Geological Implications of Heavy Minerals from Seven Rivers in Adjacent Areas of Northeastern Yinggehai Basin
WANG Ce;LIANG Xin-quan;TONG Chuan-xin;LIU Ping;PEI Jian-xiang;FU Jian-gang;JIANG Ying;ZHOU Yun;State Key Laboratory of Isotope Geochemistry,Guangzhou Institute of Geochemistry,Chinese Academy of Sciences;University of Chinese Academy of Sciences;China University of Geosciences;CNOOC China Ltd.;
Hainan located in adjacent areas of northeastern Yinggehai Basin,it is one of important sources of sediment to basin filling. In this paper,we analyzed the content,assemblages and index of heavy minerals in sediments which come form the mouth of the seven rivers in western Hainan. The study revealed that heavy minerals content,roundness,assemblages and index are obviously different from the north to south,reflecting the transport distance and parent rocks also different. The northern Zhubijiang mainly for near distance source,including a provenance of acid rocks with some metamorphic and basic-ultrabasic rocks,the dominated heavy minerals are ilmenite,tourmaline,zircon, epidote and tremolite; The northern Changhuajiang river is mainly for the long distance transportation of acid to basic rocks,the dominated heavy minerals are ilmenite,magnetite and zircon; The central Beilihe and Tongtianhe rivers are mainly from near distance source,the acid,basic and metamorphic rocks without long distance transporting,and the dominated heavy minerals are ilmenite,tourmaline,zircon,garnet and tremolite; The central Ganenhe mainly for stable-very stable minerals,they are zircon,ilmenite,titanite,tourmaline and limonite; The southern Wanglouhe and Ningyuanhe are from near transporting parent rocks,including a provenance of acid,basic and metamorphic rocks, the heavy minerals mainly for ilmenite,magnetite,limonite and epidote. Different characteristics of heavy minerals in different rivers are closely related to its source,the areas of transport and the rock types. By studying the different assemblages system of heavy minerals in different rivers,it can help to carry out source-sink comparison and analysis of Yinggehai Basin,to establish the identification signs of different detrital source area of oil and gas reservoir,and has an important geological significance for provenance identification of natural gas in different reservoir.