论文详情
锶同位素在沉积环境分析方面的应用
石油与天然气地质
2003年 24卷 第No.2期
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Title
APPLICATION OF SR ISOTOPE TO SEDIMENTARY ENVIRONMENT ANALYSIS
Authors
Shi Zhongsheng
Chen Kaiyuan
He Hujun
Shi Jun
Liu Baojun
Liu Gang
摘要
利用锶同位素地球化学行为、地球化学特征及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。结果表明,东濮盐湖下第三系Sr/Sr值普遍偏高,且大于海水Sr/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Sr/Sr(0720±0005)的壳源硅铝质岩石。锶同位素曲线变化反映了气候的变化,运用这一特征对东濮凹陷下第三系的古气候进行了分析,初步认为该区在沙河街组四段上亚段到沙河街组三段上亚段沉积时期为半干旱半湿润的气候,而从沙河街组三段上亚段到沙河街组一段沉积时期气候变得更加干旱。
Abstract
With indicating significance of geochemical characteristics of Sr isotope in sedimentary environment, characteristics of Sr isotope in Eogene saline deposits in Dongpu depression have been studied. Analysis result indicates that the value of Sr/Sr are generally higher and exceed that in the sea water,so it is inferred that Dongpu salt lake might have been an inland brine lake,and the Sr isotope in the lake water might have mainly been controlled by the silicon-aluminium rock with high Sr/Sr(0.720?0.005)value. Variation of Sr isotope curve may reflect the climate change, and the Eogene paleo-climate in Dongpu depression has also been analyzed with this feature.It is preliminarily suggested that the climate might have been semiarid and semihumid from E to E,and it became more arid from E to E.
关键词：
锶同位素;
盐湖;
沉积环境;
东濮盐湖;
Keywords:
Sr isotope;
salt lake;
sedimentary environment;
Dongpu depression;
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