库车坳陷新生代盐岩锶同位素特征及物质来源分析

南京大学学报(自然科学版) ›› 2015, Vol. 51 ›› Issue (5): 1068–1074.

库车坳陷新生代盐岩锶同位素特征及物质来源分析

王兴元1，尹宏伟1*，邓小林2，韦钊2

出版日期:2015-09-08 发布日期:2015-09-08
作者简介:(1. 南京大学地球科学与工程学院,南京,210023;2. 中化地质矿山总局地质研究院,涿州,072750)
基金资助:
国家自然科学基金项目（40872134，41272227），国家油气重大专项（2011ZX05029-001）,地质调查计划项目（1212011085517）

Strontium isotope characteristics and the origin of Cenozoic salt deposits in Kuqa basin

Wang Xing-Yuan1, Yin Hong-Wei1*, Deng Xiao-Lin2, Wei Zhao2

Online:2015-09-08 Published:2015-09-08
About author:(1.School of Earth Sciences and Engineering, Nanjing University, Nanjing, 210023, China; 2.Geological Institute of Bureau of Geology, Mining of China Chemical Industry, Zhuozhou, 072750, China)

摘要/Abstract

摘要： 新疆库车前陆坳陷新生代地层发育巨厚的蒸发岩沉积。本文通过对库车坳陷内11口钻井的盐岩样品进行锶同位素地球化学特征的分析，进一步研究坳陷内盐岩地层的成盐物质来源。测试结果表明，库车坳陷盐岩的锶同位素在0.708718—0.710868之间，不同时代的盐岩沉积的锶同位素组成明显不同。古近纪盐岩的锶同位素较低，大多在0.7093左右，与海水的锶同位素值接近，表明物质来源主要是海水。中新世盐岩的锶同位素多在0.7100以上，锶同位素组成介于海水和陆源盐湖之间，表明是海水和陆源水的混合的结果。推断库车坳陷古近纪早期受到海侵，渐新世海侵结束后，残余海水在中新世形成泻湖，与陆源卤水相混合并沉积成盐。

Abstract: Great thickness of evaporite strata were formed in Xinjiang Kuqa foreland basin during Cenozoic period. In this paper, we analyzed the strontium isotope geochemistry of salt which were collected from 11 drilling in Kuqa basin to provide insight into the origin of the deposit’s brine. Results show that the 87Sr/86Sr ratios of the samples from Kuqa basin varied from 0.708718 to 0.710868. There are different strontium isotope between two evaporite strata. The strontium isotopic ratios of Paleogene salt which are in the lower level, are mostly around 0.7093, consistent with the 87Sr/ 86Sr ratios of seawater, indicating that the brine of the salt deposits were mostly from seawater in Kuqa basin. Miocene salt samples show the 87Sr/ 86Sr ratios higher than seawater and lower than the continental water. This indicates that the brine of the Miocene salt deposits are from both seawater and continental water. We concluded that the Kuqa basin were suffered transgression in early Paleogene. The transgression ended in Oligocene. Residual seawater which formed lagoon in Miocene mixed with continental water to deposit into salt.

王兴元1，尹宏伟1*，邓小林2，韦钊2. 库车坳陷新生代盐岩锶同位素特征及物质来源分析[J]. 南京大学学报(自然科学版), 2015, 51(5): 1068–1074.

Wang Xing-Yuan1, Yin Hong-Wei1*, Deng Xiao-Lin2, Wei Zhao2. Strontium isotope characteristics and the origin of Cenozoic salt deposits in Kuqa basin[J]. Journal of Nanjing University(Natural Sciences), 2015, 51(5): 1068–1074.

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