云南江城勋野井盐类矿床Sr同位素特征及成盐物质 来源分析*

南京大学学报(自然科学版) ›› 2012, Vol. 48 ›› Issue (6): 719–727.

云南江城勋野井盐类矿床Sr同位素特征及成盐物质
来源分析*

郑智杰1,2，尹宏伟1**，张震3，郑绵平3，杨尖絮1

出版日期:2015-09-14 发布日期:2015-09-14
作者简介: (1.内生金属矿床成矿机制研究国家重点实验室，南京大学地球科学与工程学院，南京，210093;
2.中国地质科学院岩溶地质研究所，桂林，541004;3.中国地质科学院矿产资源研究所，北京，100037)
基金资助:
国家自然科学基金(40872134) ,钾盐资源地质调查计划项日(121201108 5524)，内生金属矿床成矿机制研究国家
重点实验室自主研究课题(ZZKT-201113)

Strontium isotope characteristics and the origin of salt deposits in
Mengyejing，Yunnan province，SW China

Zheng Zhi-Jie，Yin Hong -Wei，Zhang Zhen，Zheng Mian-Ping，Yang Jian-Xu

Online:2015-09-14 Published:2015-09-14
About author:(1 .State Key Laboratory for Mineral Deposits Rescarch,School of Earth Sciences and Engineering,
Nanjing University,Nanjing,210093,China;
2.lnstitute of Karst Geology,Chinese Academy of Geological Sciences,Guilin,541004,China;
3. Institute of Mineral Resources,Chinese Academy of Geological Sciences,Beijing, 100037,China)

摘要/Abstract

摘要： 滇西南思茅盆地是我国重要的含盐含钾盆地.木文通过对思茅盆地江城勋野井盐类矿床中Sr
同位素地球化学特征的分析，进一步研究其成盐物质来源.系统地采集了思茅盆地勋野井组含盐地层的
各种钾盐以及与钾盐相关的样品，并对样品进行Sr同位素(⁸⁷Sr/⁸⁶Sr)的比值测定分析，测试结果显示勋
野井盐矿⁸⁷Sr/⁸⁶Sr值基木上分布在0. 707121和0. 709734之间，与侏罗纪到现代海水的⁸⁷Sr/⁸⁶Sr比值
(0. 707-0. 7091)相吻合，表明滇西思茅盆地勋野井钾盐矿床的盐类物质来源主要是海水.另外，部分样
品87^Sr/⁸⁶Sr值(0. 709734-0. 71 1069)稍比同时期海水的⁸⁷Sr/⁸⁶Sr高但又比陆源水的⁸⁷Sr/⁸⁶Sr低，表明
其勋野井组成盐卤水在沉积过程中可能混有陆源水的影响.

Abstract: The Simao basin is an important potassium-salt related basin in Yunnan province, Southwest China. In
this paper, we analyzed the strontium isotope geochemistry of potash deposits in Mengyejing, Jiangcheng county,
Yunnan province, to provide insight into the origin of the deposit’s brine. We systematically collected samples and
measured the strontium isotope composition of salt minerals in the potash deposit. Results show that the ⁸⁷Sr/⁸⁶ Sr
ratios of the samples from Mengycjing mostly varied from 0. 707121 to 0. 709739，consistent with the⁸⁷Sr/⁸⁶Sr ratios
of seawater from the Jurassic to present(0. 707一0. 7091)，indicating that the brine of the salt mineral deposits were
mostly from scawater in Simao basin, In addition,part of the salt samples show the 87Sr/86Sr ratios(0. 70973一0. 711069)
slightly higher than scawater, but lower than the continental water.This indicates that the scawater originated brine
might have been effected by the continental water.

郑智杰1,2，尹宏伟1**，张震3，郑绵平3，杨尖絮1. 云南江城勋野井盐类矿床Sr同位素特征及成盐物质
来源分析*
[J]. 南京大学学报(自然科学版), 2012, 48(6): 719–727.

Zheng Zhi-Jie，Yin Hong -Wei，Zhang Zhen，Zheng Mian-Ping，Yang Jian-Xu. Strontium isotope characteristics and the origin of salt deposits in
Mengyejing，Yunnan province，SW China[J]. Journal of Nanjing University(Natural Sciences), 2012, 48(6): 719–727.

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