新疆库车盆地古近纪-新近纪盐湖成钾与靶区预测
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1.中国地质大学(武汉);2.中国地质科学院矿产资源研究所;3.东华理工大学

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新疆自治区重大科技专项;科技部第三次新疆综合科学考察项目


The forming and target perspective of Potash deposits in the Kuqa basin of Xinjiang during the Paleogene and Neogene periods
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1.China University of Geoscience(Wuhan);2.Institute of Mineral Resources,Chinese Academy of Geological Sciences;3.East China University of Technology

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    摘要:

    库车前陆盆地位于塔里木盆地北部,属于副特提斯域,古近纪时期受副特提斯海海水补给,古近纪-新近纪发育巨厚蒸发岩。研究显示,库车盆地中始新世和中新世古盐湖卤水已演化至钾盐析出阶段,在地层中广泛发现了原生钾盐矿物,如杂卤石、钾石盐、光卤石等;通过岩芯岩屑地球化学分析,基本确定了至少三个富钾层或成钾层位,其中始新统中上部两个和中新统中上部一个,钾离子含量最高达3%。本文在综述此前库车盆地构造、蒸发岩、盐类矿物学、地球化学与盐湖沉积等研究基础上,建立了新的库车盆地古盐湖构造-沉积演变、成钾模式;提出了四个钾盐成矿带划分,即北部克拉苏成矿带、中部秋里塔克成矿带、南部沙雅构造沉降成矿带以及东部阳霞凹地成钾区,这些关键认识为库车盆地的钾盐勘查提供了重要的理论科学依据。

    Abstract:

    Kuqa basin is located in the northern Tarim Basin, being a foreland basin. Tarim Basin belongs to the para-Tethys domain, and had experienced a few marine transgressions during Paleogene and even Neogene, meanwhile the giant evaporite formations had been deposited in the depression. Lots of researches show that middle Eocene Kuqa paleo lake had evolved into late stage of salt lake, in which potash minerals should crystalized, for example, some primary potash minerals, such sylvite, carnallite, polyhalite and syngenite and so on. Based on the chemical analysis results of cores and rock debris of cores in wells, the three K-rich layers in evaporate formations have been outlined, Two in the middle and upper Eocene and one in the middle and upper Miocene, their highest content of K reaching 3% wt. Reviewing a plenty of references relevant to tectonic, evaporite,saline minerals, geochemistry and salt-lake sedimentation, authors establish models of salt-lake tectonic evolution and potash deposits. And three belts and one area of potash formation have been determined, that is, the northern potash formation in Kalasu structure, the middle potash formation in Qiulitake structure, the southern potash formation in the subsiding area of Shaya, and the eastern potash formation in Yangxia depression. The perspective targets and signals of potash depositing have been farther studied for the future exploration of potash deposits.

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  • 收稿日期:2023-09-10
  • 最后修改日期:2023-11-01
  • 录用日期:2023-11-02
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