摘要
基于６０余种化学元素丰度的比较，发现冲绳海槽海底存在汞异常，论证了“过剩汞”系源自海底热水，指出汞异常可作为现代海底热水效应的一个地球化学指示剂。
The Okinawa Trough is located between the shallow sea area of the East China Sea and the deep sea area of western Pacific Ocean.More than 60 chemical elements in the sediments from the shelf sea of the East China Sea,the Okinawa Trough and western Pacific Ocean were determined by advanced methods,including Neutron Activation Analysis, X-Ray Fluorescence Spectrometry,Atomic Fluorescence Spectrometry and Atomic Absorption Spectrometry.Quantitative comparison of element abundance of the sediments was made based on the enrichment coefficient(K)of elements K > 1.5 indicates enrichment; K=1.5-2, weak enrichment,K=2-4,strong enrichment;and K>4,anomalous enrichment. According to the results of comparison,the sediments in the Okinawa Trough are characterized by Hg anomaly and the enrichment of such elements as Au,,Se,Te,Sb,Cd,Mn,Mo,etc..Detailed studies show that the excess Hg is not from the continent, sea water, marine organism,cosmic dust or volcanic rocks,but from hydrothermal water. The Hg anomaly is caused by modern hydrothermal activities on the sea floor, and may be used as a geochemical indicator of hydrothermal effect.
出处
《地球化学》
CAS
CSCD
北大核心
1994年第2期132-139,共8页
Geochimica
基金
国家自然科学基金
关键词
冲绳海槽
海底沉积物
汞异常
热水
Hg anomaly, hydrothermal activity,sea floor sediment, the Okinawa Trough
