| 滇西南思茅盆地盐岩Sr同位素特征及其对区域成盐作用的启示 |
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| 引用本文： | 方礼桦,夏芝广,李伟强,尹宏伟,苗忠英,刘斌,邵春景.滇西南思茅盆地盐岩Sr同位素特征及其对区域成盐作用的启示[J].高校地质学报,2019,25(5):679. |
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| 作者姓名： | 方礼桦 夏芝广 李伟强 尹宏伟 苗忠英 刘斌 邵春景 |
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| 作者单位： | 南京大学地球科学与工程学院,南京,210023;中国地质科学院矿产资源研究所自然资源部盐湖资源与环境重点实验室,北京,100037 |
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| 基金项目： | 国家重点研发计划;中国地调局地质调查项目 |
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| 摘 要： | 滇西南思茅盆地是中国西部重要的中—新生代含钾盐盆地，但其成盐物质来源一直存在争议。文章测定了滇西南思茅
盆地磨黑地区钻孔中盐岩样品的87Sr/86Sr同位素比值，同时结合区域其他含盐带已发表的Sr同位素数据，讨论成盐物质来源。
磨黑地区盐岩的87Sr/86Sr比值介于0.708598~0.709333之间，与思茅盆地其他含盐带盐岩的87Sr/86Sr比值（0.707504~0.711069）一
致，较接近于中新生代海水的87Sr/86Sr比值（0.7068~0.7092），但87Sr/86Sr比值略高于海水，显示有陆源水混合现象。结合Sr同位
素证据与盆地演化史，一些地球化学和矿物特征，作者推测思茅盆地盐岩成盐物质来源主要是海水，存在少量陆源水的混入。
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| 关 键 词： | 思茅盆地 含盐盆地 盐岩 87Sr/86Sr比值 |
Sr Isotope Characteristics of Salt Rocks in Simao Basin,Southwestern Yunnan and Its Implications |
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| FANG Lihua,XIA Zhiguang,LI Weiqiang,YIN Hongwei,MIAO Zhongying.Sr Isotope Characteristics of Salt Rocks in Simao Basin,Southwestern Yunnan and Its Implications[J].Geological Journal of China Universities,2019,25(5):679. |
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| Authors: | FANG Lihua XIA Zhiguang LI Weiqiang YIN Hongwei MIAO Zhongying |
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| Abstract: | The Mesozoic-Cenozoic Simao Basin is an important salt-bearing basin in Southwestern Yunnan, Southwestern China.
There is controversy on the origin of the salts from the Simao Basin. In this paper, we analyzed the Sr isotope characteristics of the salt
in different salt-bearing zones from the Simao Basin, to shed insights into the source of the salts. Sr isotopic (87Sr/86Sr) ratios of drill core
samples in Mohei vary from 0.708598 to 0.709333, which are consistent with the 87Sr/86Sr ratio of the salt rocks (0.707504 to 0.711069)
reported from other parts of the Simao Basin. Such range of 87Sr/86Sr ratio is consistent with that of Mesozoic-Cenozoic seawater (i.e.,
0.7068-0.7092). Based on Sr isotope evidence, in combination with the geological evolution history of the basin, geochemical and
mineral characteristics, we propose that the Mesozoic-Cenozoic salt in the Simao Basin is mainly of marine origin, but a small
proportion of terrigenous materials were delivered to basins via rivers during the evaporite-forming events. |
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| Keywords: | Simao Basin salt-bearing basin salt rocks value of 87Sr/86Sr ratio |
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