Petrography-Geochemistry and Source Significance of Submarine Fan from West Area of Qiongdongnan Basin
You Li
Liu Cai
Zhong Jia
Li Cai
Wu Shijiu
Dai Long
Abstract：The submarine fans,which exist in the west area of Qiongdongnan basin of continental shelf in northern of the South China Sea,are the main area of gas exploration.Based on the analyses of the rock types,light and heavy mineral characteristics and geochemical characteristics,the research on estimating those fans provenances is more practical to the reservoir evaluation and prediction of the petroleum exploration.The study shows that the lithology is composed mainly of fine sandstones with minor amounts of siltstone,medium and coarse sandstones;the rock types are quartz sandstone,debris-quartz sandstone and feldspar-debris sandstone;the heavy mineral assemblages are magnetite,zircon,tourmaline and leucoxene.Compared with sandstone,the content of SiO2 in the mudstone is lower,while the total content of the rare earth elements is obviously higher because of the high ferromagnesian and clay mineral in mudstone samples.It is implied that the source material were rich in quartz,poor in feldspar and containing a large number of clay minerals,mainly quartz sediment and partial intermediate igneous rocks,mainly recycled sediments,whose source regions have experienced low to moderate weathering.
Keywords：west area of Qiongdongnan basinLedong-Lingshui sagMeishan Formationsubmarine fanpetrologygeochemistry
Publication Date：2017-01-01
Online Publishing Date：2025-08-15(First online date of this platform, not the publication date of the document)
Pages：10( 1531-1540 )