石油与天然气地质 ›› 2003, Vol. 24 ›› Issue (2): 187-190.doi: 10.11743/ogg20030218

• 技术、方法与应用 • 上一篇    下一篇

锶同位素在沉积环境分析方面的应用

史忠生, 陈开远, 何胡军, 史军, 刘保军, 刘刚   

  1. 中国地质大学资源学院, 湖北武汉, 430074
  • 收稿日期:2002-09-10 出版日期:2003-06-25 发布日期:2012-01-16

APPLICATION OF SR ISOTOPE TO SEDIMENTARY ENVIRONMENT ANALYSIS

Shi Zhongsheng, Chen Kaiyuan, He Hujun, Shi Jun, Liu Baojun, Liu Gang   

  1. Resources College, China University of Geosciences, Wuhan, Hubei
  • Received:2002-09-10 Online:2003-06-25 Published:2012-01-16

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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87Sr/86Sr值普遍偏高,且大于海水87Sr/86Sr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/86Sr(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。

关键词: 锶同位素, 盐湖, 沉积环境, 东濮盐湖

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 87Sr/86Sr 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 87Sr/86Sr(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 Es4up to Es3up,and it became more arid from Es3up to Es1.

Key words: Sr isotope, salt lake, sedimentary environment, Dongpu depression

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