摘要
昭通毛坪超大型铅锌矿床是滇东北富锗铅锌多金属矿集区典型代表之一,该矿床的矿体空间定位规律、成矿作用过程等方面均与控矿构造休戚相关。本文以矿田地质力学理论与方法为指导,通过不同级别控矿构造的精细解析,揭示构造分级控矿规律、控矿构造体系及控矿构造型式,总结提出了构造控矿作用机理。研究表明,毛坪铅锌矿床自印支期以来主要历经了北东构造带→北西构造带→南北构造带→东西构造带等四期构造体系演化过程。其中,印支晚期-燕山早期北东构造带为该矿床的成矿构造体系,为区域云南“山”字型构造东翼滇东“多”字型构造体系的组成部分。在区域NW-SE向主压应力作用下,形成的NE向毛坪左行压扭性断裂、SN向洛泽河左行扭性断裂为矿床一级构造;其派生的NE向猫猫山复式倒转背斜、NNW向左行扭张性断裂及NE向切层左行压扭性断裂,为矿床的二级构造;NE向左行压扭性层间断裂为矿床三级构造;低序次的节理裂隙为矿床的四级构造;斜冲走滑断裂-复式背斜组合是该矿床的主要控矿构造型式。在此基础上,构建了毛坪富锗铅锌矿床斜冲走滑-断褶构造控矿模式,进而提出矿区深部勘查部署的主要方向。
The Maoping lead-zinc deposit in Zhaotong is a typical germanium-rich lead-zinc polymetallic ore deposit in the northeastern Yunnan.The ore-forming processes and emplacement of the orebodies of the deposit are closely controlled by the ore-controlling structures.This paper,guided by the theory and method of geological mechanics of ore fields,reveals the features and patterns of the ore-controlling structures of different levels,and puts forward the mechanism of tectonic ore-controlling.The study shows that the deposit has undergone four stages of tectonic system evolution since the Indosinian period,such as the NE structural belt,the NW structural belt,the SN structural belt,and the EW structural belt.Among them,the late Indosinian-early Yanshanian NE structural belt is the ore-forming structural system of the deposit,and is part of the NE-trending East Yunnan polygonal structural system in the eastern wing of the regional Yunnan“山”-like structure.The principal compressive stress of the NW-SE direction in the region resulted in the formation of the NE-trending Maoping sinistral compressive and the SN-trending Luozehe sinistral torsional faults which later became the first-order ore-control structures of the deposit.The resultant NE direction Maomaoshan compound inverted anticline,NNW-trending sinistral torsional-extensional fault and NE-trending cutting-bedding sinistral compressional-torsional fault are the secondary ore-control structures of the deposit.The NE-trending sinistral compressional-torsional interlayer fault is the tertiary ore-control structure of the deposit.The low-order joint fissures are the fourth-order ore-control structures of the deposit.The combination of the oblique upward strike-slip fault and compound anticline is the main pattern of the ore-controlling structure of the deposit.On this basis,this paper constructs the ore-control model of the oblique upward strike-slip-fault-fold structure of the Maoping germanium-rich lead-zinc deposit,and puts forward the main direction of deep ex
作者
吴建标
韩润生
周高明
石增龙
张艳
孙帮涛
钟华
刘心开
左家庚
WU Jianbiao;HAN Runsheng;ZHOU Gaoming;SHI Zenglong;ZHANG Yan;SUN Bangtao;ZHONG Hua;LIU Xinkai;ZUO Jiageng(Southwest Institute of Geological Survey,Geological Survey Center for Nonferrous Metals Resources,Kunming University of Science and Technology,Kunming 650093,Yunnan,China;Yiliang Chihong Co.Ltd.,Zhaotong 657600,Yunnan,China;Yunnan Chihong Zn&Ge Co.Ltd.,Qujing 655011,Yunnan,China)
出处
《大地构造与成矿学》
EI
CAS
CSCD
北大核心
2023年第5期984-1001,共18页
Geotectonica et Metallogenia
基金
云南省重大科技专项计划项目(202102AG050024)
国家自然科学基金项目(U1133602)
校企合作重点项目(2020CHYCDZB08)
云岭学者项目(2014)
云南省矿产资源预测与评价工程研究中心项目(2012)
云南省地质过程与矿产资源创新团队项目(2012)联合资助。
关键词
构造控矿作用
构造控矿模式
深部找矿方向
毛坪铅锌矿床
滇东北矿集区
tectonic ore control
tectonic ore control model
deep prospecting direction
Maoping lead-zinc deposit
ore concentration area in the northeastern Yunnan
