个旧卡房成矿区断裂构造控矿模式及找矿方向

Fault Structure Ore-controlling Pattern and Prospecting Direction of Kafang Metallogenic Area in Gejiu City

结合个旧卡房成矿区地质工作成果,在分析成矿区地质特征的基础上,对该区断裂构造成因机理、断裂构造控矿特征进行了讨论,并结合实例对区内断裂构造控矿模式进行了分析。研究表明:(1)卡房成矿区成矿作用特点鲜明,老熊硐断裂以北成矿主要集中于地表以下,在卡房段地层的层间破碎带内主要产出以锡、铜为主的矿体,矿床规模相对较小;老熊硐断裂与龙树脚断裂之间自地表往下均有成矿,主要产出层状铅、锡矿体,矿床规模相对较大;龙树脚断裂及其周围的次级断裂中主要产出锡、铅、银矿体,其中锡、铅矿体规模相对较小;(2)成矿区的断裂构造形成主要是由地区构造应力、风等自然作用力等因素耦合作用所致;(3)区内矿体类型主要有层间矿体、断裂带矿体、花岗岩接触带矿体及花岗岩蚀变带矿体;(4)断裂与地层(互层)交切处、断裂转折端处、断裂交汇锐角挟持带及断裂扎根处为成矿区矿体赋存的有利部位;(5)成矿区断裂构造的控矿模式为多元-时空耦合控矿模式。在上述分析的基础上,进一步分析认为卡房成矿区深部(地表以下500~1 500 m)隐伏矿体分布区为该区地质工作的主攻方向,并划分出黄泥硐断裂挟持带生勘区(Ⅰ~#区)、蒙子庙断裂构造透镜体生勘区(Ⅱ~#区)、老熊硐断裂构造透镜体详查区(Ⅲ~#区)、仙人硐断裂分支复合普查区(Ⅳ~#区)、龙树脚断裂转折端详查区(Ⅴ~#区)为该区较有潜力的找矿靶区。

Combing with some related geological working results of Kafang metallogenic area in Gejiu City,based on analyzing the geological characteristics of the metallogenic area,the genetic mechanism and ore-controlling characteristics of fault structure in the area are analyzed in detail,besides that,the orecontrolling pattern of the fault structure of the area is discussed based on specific example analysis. The study results show that：（1）the mineralization characteristics of Kafang metallogenic area is significant,the mineralization of the northern part of Laoxiongdong fault is mainly concentrated below the earth surface,the ore-bodies are mainly for tin and copper,the deposit scale is relative small; the mineralization is existed widely below the earth surface in the area between Laoxiongdong fault and Longshujiao fault,the layered lead and tin ore-bodies are mainly distributed in the inter-layer fault belt of the strata of Kafang section,the deposit scales are relative large; the tin,lead and silver ore-bodies are mainly distributed in the Longshujiao fault and its secondary faults,among them,the deposit scales of tin and lead ore-bodies are relative small;（2）the fault structure of the metallogenic area is the coupling results of the factors of regional tectonic stress and the natural forces（ such as wind etc.）;（3）the ore-bodies types of the metallogenic area are interlamination ore-body,fault belt ore-body,granite contact belt ore-body and granite alteration belt ore-body;（4）intersection part of fault and strata（ alternating layers）,turning end of faults,acute angle holding belt of the intersection part of faults,roof faults places are the favorable parts of ore-body occurrence in the metallogenic area;（5）the fault structure ore-controlling pattern of the metallogenic area is the one of multi-factors,multi-space and multi-time coupling results. Based on the above analysis results,the further study results show that the main prospecting potential area of the metallogenic area is concealed ore-bodies distribution area that is distributed in the depths of Kafang metallogenic area（ 500 ~ 1 500 m below the earth surface）,besides that,the five favorable prospecting target areas of the metallogenic area are delineated,they are raw prospecting area of the holding belt of Hongnidong fault（Ⅰ^# area）,raw prospecting area of Mengzimiao fault structural lens（ Ⅱ^# area）,general exploration area of Laoxiongdong fault structural lens（ Ⅲ^# area）,general prospecting area of Xianrendong fault branch composite（ Ⅳ^# area）and exploration area of the turning end of Longshujiao fault（ Ⅴ^# area）.