中文摘要：

滇西南思茅盆地是我国重要的含盐含钾盆地．本文通过对思茅盆地江城勐野井盐类矿床中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勐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，测试结果显示勐野井盐矿。^87Sr／^86Sr值基本上分布在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，表明滇西思茅盆地勐野井钾盐矿床的盐类物质来源主要是海水．另外，部分样品。^87Sr／^86Sr值（O．709734～O．711069）稍比同时期海水的。^87Sr／^86Sr高但又比陆源水的。^87Sr／^86Sr低，表明其勐野井组成盐卤水在沉积过程中可能混有陆源水的影响．

英文摘要：

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, Jiangeheng 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/^86Sr ratios of the samples from Mengyejing mostly varied from 0. 707121 to 0. 709734, consistent with the ^87Sr/^86Sr ratios of seawater from the Jurassic to present（0. 707-0. 7091） ,indicating that the brine of the salt mineral deposits were mostly from seawater in Simao basin. In addition, part of the salt samples show the ^87Sr/^86Sr ratios（0. 709734- 0. 711069）slightly higher than seawater, but lower than the continental water. This indicates that the seawater originated brine might have been effected by the continental water.