柴达木盆地中西部古近纪-新近纪背斜构造裂隙孔隙卤水成矿规律与模式
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青海省柴达木综合地质矿产勘查院

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国家自然科学基金项目(面上项目,重点项目,重大项目)


Metallogenic regularity and model of Paleogene-Neogene anticlinal fissure pore brine in central and western Qaidam Basin
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Qaidam Comprehensive Geological and Mineral Exploration Institute of Qinghai Province

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    摘要:

    近年来在柴达木盆地中西部古近纪-新近纪背斜构造地层中发现了深层裂隙孔隙卤水,其储卤层厚度大、钾锂硼资源元素含量高、部分区域成矿条件已达边界品位或工业开采品位,进一步找矿潜力巨大。本研究详细梳理柴达木盆地古近纪-新近纪地层沉积及成盐演化、卤水矿床储层特征和元素地球化学,总结了卤水资源元素的时空成矿特征及成因机制,发现盆地西部储卤地层岩性为灰质泥岩和泥岩,而盆地中部则为泥岩和粉砂岩,钾锂硼资源元素含量总体呈现由西(狮子沟-南翼山)向中(红三旱-鸭湖)、向北(鄂博梁-冷湖-南八仙)逐渐递减的趋势,这与古湖盆沉积中心迁移演化密切相关,并建立了古近纪-新近纪背斜构造裂隙-孔隙卤水矿床成矿模型,对于今后开展勘查评价及成矿预测具有较好的指导意义。

    Abstract:

    In recent years, deep fissure pore brines have been found in Paleogene-Neogene anticlinal tectonic strata in the central and western Qaidam Basin, Qinghai Province. These brines have large reservoir thickness, high content of potassium, lithium and boron resource elements, and some metallogenic conditions have reached the boundary or industrial mining grade, which have great potential for further prospecting. In this study, the sedimentary and salt-forming evolution of Paleogene-Neogene strata, reservoir characteristics and element geochemistry of brine deposits in Qaidam Basin are reviewed in detail, and the spatio-temporal metallogenic characteristics and genetic mechanism of brine resource elements are summarized. The results show that the reservoirs of brines in the west of the basin are gray mudstone and mudstone, while in the central of the basin are mudstone and siltstone. The content of potassium, lithium and boron resources gradually decreases from the west (Shizigou -Nanyishan) to the central (Hongsanhan - Yanhu) and to the north (Eboliang - Lenghu - Nanbaxian), which is closely related to the migration and evolution of the sedimentary center of the ancient lake basin. The metallogenic model of the Paleogene-Neogene anticlinal fissure pore brine deposit is established, which has a good guiding significance for future exploration evaluation and metallogenic prediction.

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  • 收稿日期:2023-09-13
  • 最后修改日期:2024-01-05
  • 录用日期:2024-02-25
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