羌塘北部胜利河凹陷侏罗系海相盐岩及资源量
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本文由中国地质调查局地质调查(编号:DD20221855、DD20230315),陕西省煤田地质集团项目(编号:SMDZ- 2022ZD- 8、SMDZ- 2021- 1),深地专项(编号:2024ZD1001005)和国家自然科学基金(编号:U24A20597)和西藏自治区科技计划(编号:XZ202401YD0006和XZ202403ZY0040)的成果


Jurassic marine salt and its resource in the Shenglihe Depression, northern Qiangtang Basin
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    摘要:

    羌塘盆地上侏罗统索瓦组、中侏罗统夏里组与布曲组、下侏罗统雀莫错组、上三叠统巴贡组海相沉积地层分别发育厚度不等的蒸发岩。北羌塘南部胜利河凹陷中侏罗统夏里组中—下段富含盐岩,凹陷中心发育32层盐岩,单层厚度2~50 m,累计厚度351 m;夏里组盐岩呈白色、灰色、紫红色、淡红色,与膏岩、泥岩、膏泥岩、泥灰岩、灰岩呈互层或夹层关系。盐岩以氯化钠为主,Cl含量20%~52%,Na含量17%~38%,Mg含量1. 0%~1. 9%,Ca含量0. 4%~5. 1%。清水湖前陆盆地夏里组盐层厚度??300 m、200~300 m、100~200 m、50~100 m分布面积分别为46 km2、55 km2、116 km2、218 km2,估算胜利河凹陷蕴藏氯化钠盐资源量超过100 Gt,部分盐层含钾较高,K含量0. 5%~1. 7%,预示羌塘盆地侏罗系具有海相钾盐找矿潜力。

    Abstract:

    It is predicted that salt should form in early Mesozoic in the Qiangtang Basin. However, no salt were discovered in the Jurassic and Triassic marine strata in the Qiangtang Basin in last decades. Drilling of wells in the Shenglihe Depression reveals salt as thick as hundreds meters in the Middle Jurassic Xiali Formation, and halite resource is estimated based on present data in the Shenglihe area of northern Qiangtang Basin. Methods: Field studies, drilling of wells, two- dimensional seismic profiling and element content analyses of core samples.Results: Marine evaporite formed in the Upper Jurassic Suowa Formation, the Middle Jurassic Xiali and Buqu Formations, the Lower Jurassic Quemoco Formation and the Upper Triassic Bagong Formation, respectively. Thick salt layers are discovered in middle—lower section of the Middle Jurassic Xiali Formation in the Shenglihe Depression, northern Qiangtang Basin. Total thickness of the salt is 351 m, and amount of salt layers is 32 with thickness of separate layer of salt range from 2 m to 50 m. Color of the salt changes from violet red, light red and pink to white and grey, and the salt layers are interbedded with gypsum, marl, mudstone and limestone in the Middle Jurassic Xiali Formation. Major component of the salt is sodium chloride (NaCl), containing Na 17%~38%, Cl 20%~50%, Mg 1.0%~1.9% and Ca 0.4%~5.1%. Salt as thick as 300~350 m, 200~300 m, 100~200 m and 50~100m cover area of 46 km2, 55 km2, 117 km2 and 218 km2, respectively, in the Qingshuihu foreland basin, central Shenglihe Depression. It is revealed that halite resource of 100 billion tonne exists in the Shenglihe Depression, and some salt layers contain potash with K 0.5%~1.7%,which indicates potential for exploration of moraine potash in the Qiangtang Basin.

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吴珍汉,杨宁,吴燕,陈云,杨兴科,季长军,刘志伟,王茜,张莉莉.2025.羌塘北部胜利河凹陷侏罗系海相盐岩及资源量[J].地质论评,71(6):2025060012,[DOI].
WU Zhenhan, YANG Ning, WU Yun, CHEN Yun, YANG Xingke, JI Changjun, LIU Zhiwei, WANG Qian, ZHANG Lili.2025. Jurassic marine salt and its resource in the Shenglihe Depression, northern Qiangtang Basin[J]. Geological Review,71(6):2025060012.

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  • 收稿日期:2025-06-29
  • 最后修改日期:2025-09-15
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  • 在线发布日期: 2025-11-18
  • 出版日期: 2025-11-15