广东京村金矿床原生晕分带特征对深部找矿预测的启示
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本文为国家自然科学基金项目(编号 41902086)和国家重点研发计划项目(编号2016YFC0600401)资助的成果。


The characteristics of primary halos zoning of the Jingcun gold deposit in Guangdong Province: implications for deep prospecting
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    摘要:

    京村金矿床位于华南两广交界的云开地区,距河台金矿田约5 km,是近些年河台金矿田外围找矿的重大突破,已达中型规模。与河台金矿田中金矿床类似,京村金矿床的金矿体也严格受韧性剪切带控制。不同的是,前者主要产于云开群糜棱岩化的混合岩中,后者则产于糜棱岩化及碎裂岩化的花岗岩中。为指导深部勘探工程部署,选择V1矿体进行原生晕分带特征研究。通过对12种微量元素的多变量统计分析表明,该矿床具有中- 低温热液型金矿床的特征,Au与Cu、As、Sb的正相关性显著,对找Au有较大的指示意义。4号勘探线原生晕轴向分带序列从上至下:Pb- Bi- W- Mo- Ag- Cu- Hg- Zn- As- Sb- Ba- Au,呈现出“反向分带序列”特征。结合地球化学参数在地下深处的转折变化规律及V1矿体尾部的前尾晕叠加共存的特征,推测标高-500 m以下可能有隐伏矿体的存在。根据以上成矿成晕元素的地球化学特征,建立了V1矿体的原生晕叠加理想模型。

    Abstract:

    The Jingcun gold deposit located in the Yunkai area, at the conjunction of Guangdong and Guangxi Province of South China and about 5 km away from the Hetai goldfield, is a major breakthrough in the periphery exploration of the Hetai goldfield in recent years, and has a medium size Au reserve. Similar to the deposit in the Hetai gold field, the ore body of the Jingcun gold deposit is strictly confined by ductile shear zones. However, the former is mainly hosted by the mylonitized Yunkai group migmatites, the latter by mylonitized and cataclastic granites. In order to guide the deep exploration, No. V1 orebody is selected for systematic primary halo zonation study. The results of multivariate statistics of 12 elements show that the deposit is likely a mesothermal to epithermal Au deposit, and elements Cu, As and Sb are the significant ore indicator elements showing notable positive correlation with Au. The primary halos axial zonation sequence of No4 exploration line from top to bottom is Pb- Bi- W- Mo- Ag- Cu- Hg- Zn- As- Sb- Ba- Au, showing reverse zonation. Moreover, the variation characteristics of geochemistry index in the deep, and the front and rear halos elements overlap and coexist at the bottom of No1 ore body, indicating a likely hidden ore body below -500 m altitude. According to the indicator elements geochemistry characteristics, the primary halos overlapping ideal model of No. V1 ore body is constructed.

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贺昌坤,陈诚,许德如,焦骞骞,黄小荣,陈根文,刘文连,师爽.2020.广东京村金矿床原生晕分带特征对深部找矿预测的启示[J].地质学报,94(12):3761-3775.
HE Changkun, CHEN Cheng, XU Deru, JIAO Qianqian, HUANG Xiaorong, CHEN Genwen, LIU Wenlian, SHI Shuang.2020. The characteristics of primary halos zoning of the Jingcun gold deposit in Guangdong Province: implications for deep prospecting[J]. Acta Geologica Sinica,94(12):3761-3775.

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历史
  • 收稿日期:2019-12-10
  • 最后修改日期:2020-07-07
  • 录用日期:2020-08-04
  • 在线发布日期: 2020-09-02