粤北花岗岩型铀矿盆岭耦合成矿过程与成矿动力探讨
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本文为科技部重点研发计划项目(编号:2017YFC06026)、中国核工业地质局铀矿调查与科研项目(编号:2020356、2021402)、中国铀业有限公司—东华理工大学联合基金资助项目(编号:NRE202105)、广东省科技专项基金项目(编号:201112166271152)及韶关市科技计划项目(编号:200624094530179)的成果。


Discussion on the basin—granites coupling metallogenic process and dynamics of the graniterelated uranium deposits in northern Guangdong
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    摘要:

    粤北地区是我国重要的花岗岩型铀矿集区,但长久以来,巨大的岩矿时差导致对铀成矿动力的厘定模糊不清,铀矿成因也就具有了多解性。本文在充分总结粤北铀矿已有研究进展的基础上,针对区内中—新生代以来形成的特有盆山体系与铀矿的内在成因,以独特的视角梳理了岩体—断陷盆地的多次挤压—拉张耦合演化过程与铀成矿动力,认为区内热液型铀矿具有“非造山”成矿特征,其成矿过程受重熔型富铀花岗岩与NE向断陷带深源断裂活动的双要素联合制约,单独的花岗岩浆活动或区域断陷活动都无法独立成矿;同时认为95 Ma时期以NE向南雄断陷盆地为标志的深源断陷活动是铀成矿的主要驱动力,晚期脉岩岩浆并不直接参与成矿,但对铀的活化和沉淀具有较重要的作用;铀成矿流体来自岩体深部早期压扭性断裂韧性变质热流体与后期张扭性断裂大气降水混合,成矿流体受NW—SE向挤压—伸展构造应力转换易在NE向断陷带夹持的NW、NNW向断裂及断陷红盆基底不整合界面成矿,因而是需重点关注的找矿方向。

    Abstract:

    Objectives: Northern Guangdong is an important graniterelated uranium ore concentration area in China, for a long time, the huge time difference between granites and uranium ores has led to the ambiguity of uranium metallogenic dynamics, and the genesis of uranium deposits has multiple hypothesis. Methods:On the basis of the research progress of uranium deposits in northern Guangdong, this paper aims at the unique basin—mountain system formed since Mesozoic—Cenozoic and the internal genesis of uranium deposits in this area, Combing the multiple compressional—extensional coupling evolution process and uranium metallogenic dynamics of rock massfaulted basin from a unique perspective.  Results:it is considered that hydrothermal uranium deposits in the area have the characteristics of "nonorogenic" mineralization characteristics, and their metallogenic process is controlled by the combination of remelting uraniumrich granite and deepsource fault activity in NEtrending faulted zone. Neither granite magma activity nor regional fault depression activity can lead to independent mineralization. At the same time, it is considered that the deepsource fault depression marked by NEtrending Nanxiong fault basin in 95 Ma period is the main driving force of uranium mineralization, and the late vein magma does not directly participate in mineralization. However, it plays an important role in the activation and precipitation of uranium.  Conclusions: Uranium oreforming fluid comes from the mixture of early compressional fracture toughness metamorphic thermal fluid and later tensional fracture meteoric water in the deep part of rock mass. Oreforming fluid is easily mineralized at NW, NNW faults clamped by NEtrending fault zone and unconformity interface of red basin basement. Therefore, it is an important prospecting direction.

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祁家明,刘斌,刘文泉,叶永钦,徐争启.2022.粤北花岗岩型铀矿盆岭耦合成矿过程与成矿动力探讨[J].地质论评,68(2):571-585,[DOI].
QI Jiaming, LIU Bin, LIU Wenquan, YE Yongqin, XU Zhengqi.2022. Discussion on the basin—granites coupling metallogenic process and dynamics of the graniterelated uranium deposits in northern Guangdong[J]. Geological Review,68(2):571-585.

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  • 收稿日期:2021-05-14
  • 最后修改日期:2021-12-31
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  • 在线发布日期: 2022-03-19
  • 出版日期: 2022-03-15