海洋地质与第四纪地质2017，Vol.37Issue(5)：70-81,12.DOI:10.16562/j.cnki.0256-1492.2017.05.007
南海琼东南海域沉积物的微量元素地球化学特征及其对天然气水合物的指示意义
TRACE ELEMENT GEOCHEMISTRY OF SEDIMENTS IN QIONGDONGNAN AREA, THE SOUTH CHINA SEA,AND ITS IMPLICATIONS FOR GAS HYDRATES
摘要
Abstract
In order to study the geochemical characteristics of trace elements and their implications for gas hydrate,marine sediment samples were systematically collected from the Qiongdongnan area of the South China Sea.The major and trace elements as well as the TOC of the sediments are analyzed,upon which the redox condition,redox-sensitive elements and their TOC correlation are adopted to describe the geochemistry characteristics of sediments.The results indicate that Sr,Pb,Th,U,Zn,Cu and Mo are enriched in the sediments comparing to the average of upper crust.Systematic variations in Th/U,V/Cr values further indicate that the sediments are under a more reducing condition,and as the results,Mo and U are enriched.Some sediment samples have already dropped into the sulfide zone,leading the enrichment of redoxsensitive elements such as Mo and U,owing to the dissociation of gas hydrate and methane fluxes coming from deeper sediments.Therefore,the existence of the sulfide zone and Mo and U enrichment in sediments may have the significance to trace the gas hydrates in deep.关键词
微量元素/海洋沉积物/硫化氢/天然气水合物/琼东南海域Key words
trace elements/marine sediments/H2S/gas hydrate/Qiongdongnan area分类
天文与地球科学引用本文复制引用
邓义楠,方允鑫,张欣,陈芳,王海峰,任江波,刘晨晖,关瑶..南海琼东南海域沉积物的微量元素地球化学特征及其对天然气水合物的指示意义[J].海洋地质与第四纪地质,2017,37(5):70-81,12.基金项目
国土资源部海底矿产资源重点实验室项目(KLM-MR-2015-A-03,KLMMR-2013-A-24) （KLM-MR-2015-A-03,KLMMR-2013-A-24）
中国地质调查局项目(GZH201100303) （GZH201100303）
科技部“973”项目(2013CB835004) （2013CB835004）
