渤海湾沉积地球化学记录及其对环境变迁的指示  

SEDIMENTARY GEOCHEMICAL RECORDS:INDICATIONS OF ENVIRONMENTAL CHANGES IN BOHAI BAY

作　　者：赵广明[1,2] 叶思源[2,3] 李广雪[1] 高国勇[4] 

机构地区：[1]中国海洋大学海洋地球科学学院,青岛266100 [2]国土资源部海洋油气资源和环境地质重点实验室,青岛266071 [3]青岛海洋地质研究所,青岛266071 [4]黄河口水文资源勘测局,东营257061

出　　处：《海洋地质与第四纪地质》2009年第5期51-57,共7页Marine Geology & Quaternary Geology

基　　金：国土资源部海洋油气资源和环境地质重点实验室开放基金(MRE200803);国家自然科学基金(40642009)

摘　　要：对采自渤海湾西岸潮下带的两个沉积物岩心,研究了沉积物的210Pb放射性活度、粒度以及Corg、As、Hg等地球化学演变特征,结果表明,研究区沉积速率随深度不同呈分段性,QH YH01和QH YH02柱状沉积物平均沉积速率分别为19.1及24.3mm/a,在沉积物深度120cm以上,前者沉积物物源主要受控于海河,后者受控于黄河。地球化学环境早期经历了高Ca低Cl—低Ca高Cl的多次地球化学旋回,其对应的痕量元素As、Hg在QH YH01柱也呈现规律性的浓度演变。此外,自20世纪50年代以来,QH YH02站位的Hg、As浓度呈明显增高的趋势,而QH YH01柱Hg的递增可能是沉积物再悬浮形成的二次污染。Based on the analysis of ^210Pb radioactivity,grain size and element geochemical contents （Corg, As, Hg etc） of 2 cores collected from subtidal zone of the west coast of Bohai Bay in 2007 ,the results show that the deposition rate is divided into different subsections with different depths. The average deposition rate is 19.1 mm/a and 24.3 mm/a in QHYH 01 and QHYH 02 stations. Above the depth of 120 cm,sediments mainly came from Haihe River and then from Yellow River. Multiple geochemistry gyration of high content of Ca,low content of Cl,low content of Cl,high content of Ca occurred in the early geochemistry environment ,and the corresponding trace elements of As and Hg were regular in QHYH 01 station. From 1950s ,the contents of Hg and As have the rising trend in QHYH 02 station ,but the rising content of Hg may be caused by the second pollution of re-suspension in QHYH01 station.

关 键 词：^210Pb放射性活度 沉积速率 地球化学 渤海湾 

分 类 号：P736.4[天文地球—海洋地质]