地学前缘 ›› 2020, Vol. 27 ›› Issue (4): 199-218.DOI: 10.13745/j.esf.sf.2020.6.33

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湘南黄沙坪铜锡多金属矿床构造控岩控矿机制及深部找矿勘查启示

韩润生,赵冻,吴鹏,王雷,邱文龙,隆运清,刘凤平,邓安平,宗志宏   

  1. 1. 昆明理工大学: 有色金属矿产地质调查中心西南地质调查所, 云南 昆明 650093
    2. 玉溪师范学院, 云南 玉溪 653100
    3. 湖南有色黄沙坪矿业分公司, 湖南 郴州 424421
  • 收稿日期:2019-08-26 修回日期:2019-10-11 出版日期:2020-07-25 发布日期:2020-07-25
  • 作者简介:韩润生(1964—),男,研究员,博士生导师,构造成矿动力学及隐伏矿预测、矿床学研究方向。E-mail:554670042@qq.com
  • 基金资助:

    国家重点研发计划项目“钦杭成矿带湘南段铜锡多金属矿产深部探测技术示范:控矿构造体系与深部矿赋存规律” (2018YFC0603902);云岭学者项目(2014);云南省矿产资源预测与评价工程实验室(2011)、地质过程与矿产资源省创新团队项目(2012);云南省高校、昆明理工大学成矿动力学与隐伏矿预测创新团队项目(2008)

Mechanisms of rock- and ore-controlling structures and the implications for deep prospecting in the Huangshaping Cu-Sn polymetallic deposit, southern Hunan Province, China

HAN Runsheng,ZHAO Dong,WU Peng,WANG Lei,QIU Wenlong,LONG Yunqing,LIU Fengping,DENG Anping,ZONG Zhihong   

  1. 1. Kunming University of Science and Technology; Southwest Geological Survey, Geological Survey Center for Nonferrous Mineral Resources, Kunming 650093, China
    2. Yuxi Normal University, Yuxi 653100, China
    3. Hunan Nonferrous Huangshaping Mining Branch Co., Chenzhou 424421, China
  • Received:2019-08-26 Revised:2019-10-11 Online:2020-07-25 Published:2020-07-25

摘要:

黄沙坪铜锡多金属矿床是在钦杭成矿带和南岭成矿带叠合构造背景下形成的岩浆热液型多金属成矿系统的典型代表,该区铜多金属矿与锡多金属矿成矿系统复合、多期构造体系联合、深部钨锡矿与浅部铅锌银矿耦合等特点突出。针对该矿床控矿构造深部展布格局不清、深部铜锡多金属矿体定位不明的核心问题,基于矿田(床)构造精细解析,开展了多期构造体系控岩控矿作用机理及其控矿构造深延格局的深入研究,表明岩浆侵入接触构造系统与倒转背斜翼部的层间断裂裂隙系统分别控制了脉状不规则SK型铜钨锡多金属矿体群与沿NNE-NE向层间断裂带、NW向断裂带分布的热液脉型铅锌银(金)矿体群,这些矿体群具有不同的侧伏规律;基于矿田、矿床、矿体(脉)尺度控岩控矿构造组合样式的剖析,揭示了构造分级控岩控矿规律和中心对称成矿效应,厘清了成矿前、成矿期和成矿后构造体系,构建了矿田构造控岩控矿模式,进一步论证了坪宝矿田成矿构造动力学背景:中生代以来,坪宝矿田构造应力作用呈现“顺时针式”的运动方式,在燕山早期太平洋板块与华夏板块发生碰撞造山作用,在区内产生SEE-EW向主压应力作用,从而在矿田内形成了中酸性岩浆侵入成岩成矿系统。这些认识为坪宝矿田乃至钦杭、南岭成矿带湘南地区深部找矿勘查提供了重要启示。

关键词: 构造控岩控矿机制, 岩浆热液系统, 中心对称成矿效应, 深部找矿勘查, 钦杭、南岭成矿带, 黄沙坪铜锡多金属矿床

Abstract:

The Huangshaping Cu-Sn polymetallic deposit is a typical magmatic-hydrothermal polymetallic deposit formed in the superimposed tectonic background of the Qinzhou-Hangzhou and Nanling metallogenic belts. This region is characterized by the compounding of Cu and Sn rich polymetallic metallogenic systems, combination of multi-period tectonic systems, and coupling between deep W-Sn and shallow Pb-Zn orebodies. However, the complex ore-controlling structural systems and position of deep Cu-Sn polymetallic orebodies are unclear. In this report, we carried out an in-depth study on the ore- and rock-controlling mechanisms, based on a detailed analysis of the deep-spreading pattern of the ore field structures. The results showed that the intrusive contact zone structural systems and the interlaminar fault-fracture systems, in two flanks of the overturned anticlines, control the distribution of the vein-irregular skarn type Cu-W-Sn polymetallic orebodies, and the hydrothermal vein type Pb-Zn-Ag-(Au) orebodies occurring along the NNE-NEE-trending interbedded and NW-trending faults, respectively. These orebodies have different lateral transverse features. By dissecting different combinations of ore-controlling structures for ore field, mineral deposits and orebodies, we revealed the hierarchical rules of rock- and ore-controlling structures and their central symmetry metallogenic effect, clarified the pre-mineralization and ore-forming periods and the post-mineralization structural systems, and established a rock- and ore-controlling structural model for the Huangshaping-Baoshan ore field. At the same time, we further clarified the dynamic background of the ore-forming process in the ore fields as follows: Since the Mesozoic era, the tectonic stress action of the ore-field experienced a ‘clockwise-style’ movement. In the early stage of the Yanshanian movement, the collision between the Pacific and the Cathaysia Plates resulted in the SEE-EW-trending principal compressive stress field. As a result, the ore related medium acidic magmatic intrusion and ore forming system are formed. This understanding provides important inspirations for deep prospecting and exploration in southern Hunan Province.

Key words: mechanisms of rock- and ore-controlling structures, magmatic hydrothermal system, central symmetry metallogenic effect, deep prospecting and exploration, Qinzhou-Hangzhong and Nanling metallogenic belts, Huangshaping Cu-Sn polymetallic deposit

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