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ZHAO Xing-qi, CUI Shou-kai, CAI Ya, LU Chong, YANG Xian-xian, ZHANG Yong, WANG Wei, SHI Qing-ping. 2021. Metallogenic Conditions and Prospecting Targeting of Sandstone-type Uranium Mineralization in Mahai Area, Northern Qaidam Basin. Acta Geoscientica Sinica, (5): 593-604. doi: 10.3975/cagsb.2021.012501
Citation: ZHAO Xing-qi, CUI Shou-kai, CAI Ya, LU Chong, YANG Xian-xian, ZHANG Yong, WANG Wei, SHI Qing-ping. 2021. Metallogenic Conditions and Prospecting Targeting of Sandstone-type Uranium Mineralization in Mahai Area, Northern Qaidam Basin. Acta Geoscientica Sinica, (5): 593-604. doi: 10.3975/cagsb.2021.012501
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Metallogenic Conditions and Prospecting Targeting of Sandstone-type Uranium Mineralization in Mahai Area, Northern Qaidam Basin

  • 1. CNNC Key Laboratory of Uranium Resources Exploration and Evaluation Technology, Beijing Research Institute of Uranium Geology, Beijing 100029;

  • 2. PetroChina Qinghai Oilfield Company, Dunhuang, Gansu 736202

Received Date:  28 October 2020
Revised Date:  08 January 2021
    Abstract
  • Based on the systematic analysis of uranium source conditions, tectonic features, hydrogeological features, epigenetic alteration features and uranium mineralization features in Mahai area of Northern Qaidam Basin, the authors infer that the Upper Ganchaigou Formation of Oligocene period and the Lower Youshashan Formation of Miocene period have a good prospect for exploration of sandstone-type uranium deposits in this area.With two relatively gentle anticlines and deep faults connecting deep source rocks and shallow sand bodies and well-developed sedimentary systems of braided river and delta, Saishitengshan and Lücaoshan area has abundant uranium sources.A number of stable mudstone-sandstone-mudstone structures have been developed, with a perfect complement-runoff-drainage system of groundwater.Furthermore, phreatic oxidation zone, phreatic-interlayer oxidation zone and interlayer oxidation zone uranium mineralizations are developed, which are characterized by uranium prospecting indicators with hydration anomaly, high soil radon anomaly and “two high and one low” feature.The uranium mineralization process mainly experienced three stages: sedimentary-diagenetic pre-enrichment stage, paleo-phreatic water and paleo-interlayer oxidation stage, and transformation and preservation stage.It can be suggested that, near Maxian fault and slope structural belt of Mahai anticline, the braided channel subfacies and delta plain distributary channel subfacies of Upper Ganchaigou Formation of Oligocene period and Lower Youshashan Formation of Miocene period constitute the key prospecting directions of sandstone-type uranium deposits in Mahai area, and the main prospecting types are interlayer oxidation zone and phreatic-interlayer oxidation zone, followed by phreatic oxidation zone.
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