西南石油大学学报(自然科学版) ›› 2003, Vol. 25 ›› Issue (5): 8-8–11.DOI: 10.3863/j.issn.1000-2634.2003.05.03

• 地质勘探 • 上一篇    下一篇

东濮凹陷下第三纪锶同位素地球化学分析

史忠生1 陈开远2 杜雪晴2 柳保军2 刘刚2 何胡军2
  

  1. (1.中国地质大学硕2001-3班,湖北 武汉 430074; 2.中国地质大学资源学院)
  • 收稿日期:2002-10-14 修回日期:1900-01-01 出版日期:2003-10-20 发布日期:2003-10-20

SR ISOTOPE’S ANALYSIS OF THE PALEOGENE OF DONGPU DEPRESSION

SHI Zhong-sheng1 CHEN Kai-yuan2 DU Xue-qing2 LIU Bao-jun2 LIU Gang2 HE Hu-jun2   

  1. ( China University of Geosciences, Wuhan Hubei 430074, China)
  • Received:2002-10-14 Revised:1900-01-01 Online:2003-10-20 Published:2003-10-20

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/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(0.720±0.005)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段时期为半干旱半湿润的气候,而从Es3段到Es1段时期气候变得更加干旱。

关键词: 同位素, 盐湖, 沉积环境, 东濮盐湖

Abstract:

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 87Sr/86Sr are generally higher and exceed the marine. So the paper concluded the Dongpu saline is a continental lake and the content of 87Sr/86Sr are mainly controlled by the silicon-aluminium rock whose 87Sr/86Sr(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4to Es上3and it got more drought from Es3上to Es1.

Key words: isotope, saline, sedimentary environment, Dongpu depression

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