| 柴达木盆地大浪滩盐矿床基本特征及形成机理 |
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| 引用本文：王弭力,王仪杰,刘成林,陈永志.1993.柴达木盆地大浪滩盐矿床基本特征及形成机理[J].地球学报,14(1):97-114. |
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| 中文摘要:大浪滩盐矿床已定名的24种盐类矿物中,钾镁盐矿物占13种。光卤石为其中主要钾矿物,已富集成钾矿层。本文在对盐矿物分布规律及沉积物地球化球研究的基础上,阐明了盐湖演化发展规律及钾矿层与其他盐矿物的形成机理。 |
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| THE FEATURES AND GENESIS OF THE DALANGTAN SALT DEPOSIT IN THE QAIDAM BASIN |
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| Abstract:The Dalangtan Basin, with a typical inland saline lake deposition of MgSO4 subtype, is a subbasin of the Qaidam Basin in Qinghai Province. Some K-Mg saline minerals such as bischofite, carnallite, sylvite, leonite, leoweite, epsomite, etc. can be found in the basin.The evolution of and salt deposition in the basin were principally controlled by the neotectonic movement. The basin was separated into a series of depressions by neotectonism in the Late Tertiary and hence started the period of salt deposition. As a result of successive tectonic movement, the basin got more closed, the materials supplied from outside gradually decreased, the salinity of the lake water increased cyclically, and finally the basin dried up. While the center of sedimentation migrated from the east to the west and. then to the north, the typical phase change series of carbonate-sulphate-K-Mg salt minerals was formed.The geochemical variations of sediments partly reflect the affect of tectonic movement during the evolution of the basin.The brine in the salt-bearing strata of the Quaternary was mainly derived from the inland river and/or lake, and also was partly mixed up with deep circulating water in some places. The insufficient K-Mg supply and more than 33 desalinations occurring during the evolution of the basin resulted in incomplete saline deposit phases and inconsiderable content of K-Mg salt minerals in the Dalangtan Basin.The further study has revealed that in the sediment profile there are six reverse sequences marked by the occurrance of the late-formed minerals, such as bischofite, sylvite, leonite, etc. beneath halite in the same rhythmic unit. Since the reverse sequence is a typical feature of playa, the presence of the six reverse-sequences suggests that there were six playa periods in the history of the Dalangtan Salt Lake. |
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