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西秦岭寨上金矿床构造控矿特征与成矿规律

  • 张斌 ,
  • 刘家军
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  • 1.中国地质大学(北京)地球科学与资源学院,北京 100083
    2.中国地质大学(北京)地质过程与矿产资源国家重点实验室,北京 100083
张斌(1998-),男,广东梅州人,本科生,从事矿床学相关研究工作。870511694@qq.com

收稿日期: 2020-06-01

  修回日期: 2020-07-05

  网络出版日期: 2021-01-29

基金资助

国家自然科学基金重点项目“秦岭成矿域复合造山过程中印支—燕山期金—多金属成矿作用”(41730426)

Characteristics of the Ore-control Structure in the Zhaishang Gold Deposit in Western Qinling Region

  • Bin ZHANG ,
  • Jiajun LIU
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  • 1.School of Earth Sciences and Resources,China University of Geosciences (Beijing),Beijing 100083,China
    2.State Key Laboratory of Geological Processes and Mineral Resources,China University of Geosciences(Beijing),Beijing 100083,China

Received date: 2020-06-01

  Revised date: 2020-07-05

  Online published: 2021-01-29

摘要

寨上金矿床是西秦岭造山带礼—岷成矿带西段一个十分重要的类卡林型金矿床。矿体赋存于泥盆—二叠系的浅变质碎屑岩和碳酸盐岩的层间破碎带中,受构造控制明显。为了分析构造与成矿之间的关系,对寨上金矿区构造裂隙进行了野外观察和统计分析,并对构造控矿规律进行了总结。研究结果表明:寨上金矿床的主要控矿构造方向为NW向;寨上金矿床的成矿具有多期次的特点,与多期次的构造运动相对应;印支期是本矿床一个重要的构造期,该期SN向的挤压应力对节理裂隙的形成有十分重要的影响,并在此应力作用下元素富集形成了早期的矿体;燕山期受NE向扭应力作用,NW向构造发生继承性活动,岩浆热液顺裂隙就位,混入大气降水,在早期矿体上叠加成矿。

本文引用格式

张斌 , 刘家军 . 西秦岭寨上金矿床构造控矿特征与成矿规律[J]. 黄金科学技术, 2020 , 28(6) : 825 -836 . DOI: 10.11872/j.issn.1005-2518.2020.06.097

Abstract

During the 1990s,with the deepening of research and exploration of carlin-type gold deposit in China on the basis of the connotation of carlin-type gold deposit,some gold deposits were discovered and redefined as carlin-like gold deposits.This is a class of gold deposits that show similar geological characteristics to the carlin-type gold deposit,but their geochemical characteristics are obviously different.The Zhaishang gold deposit located in the western part of the Li-Min metallogenic belt within the western Qinling Mountains is a very important carlin-like disseminated gold deposit.Since it was discovered through geochemical anomaly information and civil mining information in 2 000,many workers have carried out geological,geochemical,geophysical,remote sensing,engineering and other aspects of exploration,as well as researches on mineral composition,texture and structure of rock,orebody distribution,fluid source and ore-forming conditions,showing the superior metallogenic geological conditions and great prospecting potential of the deposit.Based on a large number of field work data and analysis of ore-forming characteristics in the mining area,we mainly studied the No.31 vein and the Zhamashu ore section in the South ore belt,taking the measurement and analysis of structural traces of different scales as the basis.On the basis of the analysis of the ore control law of the structure,the “three in one” ore-forming model of ore-forming geological body,ore-forming structure,ore-forming structural plane and ore-forming characteristics was summarized to guide the prospecting systemati-cally.The results of field observation and statistical analysis on the structural fissures of the Zhaishang gold deposit show that the most developed joints are in the NW-SE direction of 106°~137°,and the joints in the NE-SW direction of 196°~229° come second.It is indicated that the SN-trending compressive stress in Indosinian period,which is an important structural period of the gold deposit,formed most of the joint fractures of the deposit.And the deposit is mainly formed in Indosinian and Yanshanian tectonic movements,the orebody is controlled by folds,faults and strata.In Yanshanian period the deposit was mainly controlled by NE-trending positive torsional stress,which led to the successive activity of NW-trending structure formed in the Indosinian period,the emplacement of magmatic hydrothermal fluid along fractures,the mixing of atmospheric precipitation,and the superimposition of mineralization on the early orebodies.

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