CAJ | 학술논문

庐枞矿集区位于长江中下游成矿带，内赋有大型铁矿床、铜矿床及一系列中小型铅锌、铜、铜金矿床。为理解矿集区成岩成矿与深部结构的关系，通过5条大地电磁测深剖面，获得了庐枞矿集区及其邻区10 km以浅的地电结构。地下电性分布清晰地反映了区域断裂位置、庐枞火山岩盆地的双层结构，指示了遭受多期构造运动的庐枞火山岩盆地外围基底出露区和大别造山带及其前陆地堑式凹陷盆地结构特征，划分了形成于不同时期、不同性质的地质构造单元，识别了火山盖层厚度和控制庐枞火山岩盆地范围的边界断裂。电性异常部位显示，与沙溪斑岩型铜矿具有成因联系的闪长岩体表现出亲造山带，可能为独立于火山岩盆地的具有不同演化路径的岩浆系统。通过3条北西-南东走向和2条北东-南西走向的剖面特征对比发现从浅至深北东-南西向构造在研究区内均占主导地位。根据一系列受断裂控制的北东-南西走向不同构造单元特征可以推演，在晚侏罗世挤压背景向早白垩纪伸展机制转变时，燕山期构造继承了印支期造山运动的前陆构造体系。
려종광집구위우장강중하유성광대，내부유대형철광상、동광상급일계렬중소형연자、동、동금광상。위리해광집구성암성광여심부결구적관계，통과5조대지전자측심부면，획득료려종광집구급기린구10 km이천적지전결구。지하전성분포청석지반영료구역단렬위치、려종화산암분지적쌍층결구，지시료조수다기구조운동적려종화산암분지외위기저출로구화대별조산대급기전륙지참식요함분지결구특정，화분료형성우불동시기、불동성질적지질구조단원，식별료화산개층후도화공제려종화산암분지범위적변계단렬。전성이상부위현시，여사계반암형동광구유성인련계적섬장암체표현출친조산대，가능위독립우화산암분지적구유불동연화로경적암장계통。통과3조북서-남동주향화2조북동-남서주향적부면특정대비발현종천지심북동-남서향구조재연구구내균점주도지위。근거일계렬수단렬공제적북동-남서주향불동구조단원특정가이추연，재만주라세제압배경향조백성기신전궤제전변시，연산기구조계승료인지기조산운동적전륙구조체계。
The Lujiang-Zongyang ore concentrated area is one of the most important ore concentrated areas in the middle and lower region of the Yangtze River metallogenic belt of China.Five magnetotelluric (MT ) sounding profiles have been conducted to understand the relationship between the metallogeny and petrogensis,and the deep conductivity structure.The underground conductivity structures extending from the shallow surface down to 10 kilometers clearly show the boundaries of the buried faults.It also shows the duple structures of the Luj iang-Zongyang volcanic basins as well as the characteristics of the Dabie orogeny,the foreland depressed basin and the exposed basements.The electrical resistivity anomalies show that the diorite porphyry hosted copper deposits in Shaxi area is the Dabei orogenic affinity which is different from the volcanic basin in magma evolutionary.The two-dimensional inversion results on the three NW-SE and the two NE-SW directed profiles shows that the NE-SW directed conductivity structures are dominant in this area.Inferred from the characteristics of tectonic units which controlled by NE-SW trending faults,we find that the Yanshanian structures was inherited from the Indosinian structures.