赣北地区类转换断层及其控岩控矿作用研究  

Study of transform like fault and its rock-and ore-controllingrole in the northern Jiangxi Province

作　　者：刘南庆[1] 秦润君[1] 陈茂松 孙团结[1] 卢宝荣 LIU Nanqing;QIN Runjun;CHEN Maosong;SUN Tuanjie;LU Baorong(NO.Geological Party,Jiangxi Bureau of Geology Mineral Exploration,Jiujiang,Jiangxi 332100,China;Department of Land and Resources of Jiangxi Province,Nanchang,Jiangxi 330025,China)

机构地区：[1]江西省地质矿产勘查开发局九一六大队,江西九江332100 [2]江西省自然资源厅,江西南昌330025

出　　处：《地质学报》2022年第6期1957-1971,共15页Acta Geologica Sinica

基　　金：中国地质调查局项目(编号12120114034501,DD2016005234);江西省地质矿产勘查开发局项目(赣地矿办发[2013]70号文)联合资助的成果。

摘　　要：基于最新的区域地质调查、矿产勘查成果资料,结合赣北地区大地构造背景、重力场、构造单元及重要矿床(田)控岩控矿构造特征的综合分析,厘定了赣北地区类转换断层,并探讨其形成机制与控岩控矿作用。结果表明,该类转换断层是一组位于晋宁期华南洋壳俯冲消减带,受纵向俯冲消减速率不同和深部地幔隆起垂直转换断层影响,在仰冲盘NEE—NE向构造单元中发育的横向断层;其与单元边界断层相匹配,沿着断层的水平和垂向位移转换了性质,亦是区域重要外生沉积(变质)和内生岩浆热液型矿产的控岩控矿断层,伴随大地构造演化和“环鄱”巨型矿集区生成;在空间规模上有一定的主、辅之分,其中主体类转换断层导致了新余铁矿和丰城煤矿岩(矿)层的纵向增生(膨大)及垂向增厚(折叠),并叠加了后续横向脆性断裂构造变形,维护了相对较弱的应变环境,对矿产起到保护作用;辅体类转换断层控制了修水县香炉山钨矿床、武宁县大湖塘钨铜多金属矿田、九瑞铜多金属成矿带、德安县彭山锡多金属矿田、都昌县阳储岭钨钼矿床、波阳县莲花山钨锡矿集区、浮梁县朱溪钨铜多金属矿田及德兴铜多金属矿田等钨铜锡多金属矿产的成矿地质要素,且表现出隆起区与坳陷区控岩控矿机制不同但成矿机理相似的成矿规律。This paper is based on the latest achievements of regional geological survey and mineral exploration,combined with the comprehensive analysis of the geotectonic background,gravity field,tectonic unit,and the rock-and ore-controlling structural characteristics in important deposits(fields).We study the transform like fault in the northern Jiangxi Province,and also theoretically explore its formation mechanism and rock-and ore-controlling role.The results show that the transform like fault,which is a set of lateral faults located above the subduction zone of the Jinningian oceanic crust in southern China,develops in the structural unit of NEE—NE direction of the obducted sheet,and is affected by different vertical subduction rates and deep mantle uplift vertical transform like faults.It matches with the unit boundary faults,and transforms its properties along the horizontal and vertical displacements of the faults.It is also the rock-and ore-controlling fault of the important exogenous sedimentation(metamorphic)and endophytic magmatic hydrothermal minerals in the region,accompanied by the tectonic evolution and the formation of the vast ore concentration area around the Poyang Lake.There are some differences between the main and the auxiliary in spatial scale,among which the main transformation fault leads to the vertical accretion(expansion)and vertical thickening(folding)of the rock(ore)layers in the Xinyu Iron and the Fengcheng Coal mines,and superimposes the subsequent transverse brittle fault structural deformation,which maintains the relatively weak strain environment and plays a protective role in the mineral resources.The auxiliary transformation fault controls the metallogenic geological elements of W-Cu-Sn polymetallic deposits,such as the Xiushui Xianglushan W-deposit,the Wuning Dahutang W-Cu polymetallic ore fields,the Jiurui Cu polymetallic ore belt,the De’an Pengshan Sn polymetallic ore field,the Duchang Yangchuling W-Mo deposit,the Boyang Lianhuashan W-Sn ore concentration area,the Fuliang Zhuxi

关 键 词：类转换断层 垂直转换断层 控岩控矿作用 “环鄱”巨型矿集区 赣北地区 

分 类 号：P612[天文地球—矿床学]