摘要
主要介绍了锶同位素地球化学行为及其地球化学特征 ,并利用这些特征在沉积环境方面的指示意义 ,分析了东濮凹陷下第三系盐湖沉积的锶同位素特征。分析结果表明 :东濮盐湖下第三系的87Sr/86 Sr值普遍偏高 ,且大于海水87 Sr/86 Sr值 ,因此推断东濮盐湖属于一个内陆盐湖 ,其湖水锶同位素的主要控制因素为高87Sr/86 Sr(0 .72 0±0 .0 0 5 )的壳源硅铝质岩石 ;同时对下第三系的古气候也进行了分析 ,初步认为该区在E4上 段到Es3上 段时期为半干旱半湿润的气候 ,而从Es3 上 段到Es1
Geochemistry behavior and character of Sr isotope were mainly introduced in this paper. Based on the trait of sedimentary environment, the character of Sr isotope of Paleogene of Dongpu depression was analyzed. The results have indicated the value of 87 Sr/? 86 Sr are generally higher and exceed the marine. So the paper concluded the Dongpu saline is a continental lake and the content of 87 Sr/? 86 Sr are mainly controlled by the silicon aluminium rock whose 87 Sr/? 86 Sr(0.720±0.005)is very high. At the same time, the climate of Paleogene of this area was also analyzed in this paper, which indicated it was the half drought and half humid climate from E 上 4 to Es 上 3 and it got more drought from Es 上 3 to Es 1.
出处
《西南石油学院学报》
CSCD
2003年第5期8-11,共4页
Journal of Southwest Petroleum Institute
关键词
同位素
盐湖
沉积环境
东濮盐湖
isotope
saline
sedimentary environment
Dongpu depression
