华北陆块晋冀Al-Fe-Au-Pb-Zn-Ag-Cu-煤成矿带主要地质成矿特征及潜力分析

Geological Characteristics and Mineral Resource Potential of the Jin-Ji Al-Fe-Au-Pb-Zn-Ag-Cu-Coal Metallogenic Belt in the North China Block

华北陆块晋冀成矿带是我国重要的金属和能源矿产资源基地,近年来新的找矿进展和预测成果不断涌现,使之成为我国重点找矿地区之一,需要对其开展系统的成矿区划和部署研究工作。本文以新的研究成果和找矿突破为基础,通过综合分析,在该地区划分新的重要成矿部署区带,厘定边界并将其命名为"华北陆块晋冀Al-Fe-Au-Pb-Zn-Ag-Cu-煤成矿带"。结合区域成矿地质背景的综合研究,在区内划分了10个成矿亚带,初步建立了Al-Fe-Au-Pb-Zn-Ag-Cu-煤成矿带成矿谱系,其成矿作用具有多期次发育和多系统控制的特点,在时间演化上表现为多旋回性、继承性、新生性和叠加性特点,主要成矿期有前寒武纪,寒武纪-晚二叠世,晚三叠世-晚白垩世和新生代,其中晚侏罗-早白垩世是内生金属矿床成矿大爆发期。该带产出的矿床类型复杂多样,与岩浆有关成矿作用有岩浆岩型、斑岩型、矽卡岩型、海(陆)相火山岩型、岩浆热液型和石英脉型,变质成矿作用有沉积变质型、绿岩建造型,层控成因矿床有碳酸盐岩中热液型,沉积成矿作用有海(陆)相沉积型、砂矿型、风化壳型矿床等。结合区域找矿进展和潜力评价最新成果,认为本区铝土矿、铁、金、锰、钼、铜、铅锌、煤矿潜力巨大,为下一步勘查部署的主攻矿种,同时在本区划分了26个重点远景区,对研究区下一步矿产勘查部署工作有一定指导意义。

The Jin-Ji Al-Fe-Au-Pb-Zn-Ag-Cu-coal metallogenic belt of North China Block is one of the important national bases of mineral and energy resources.The new prospecting progress and prediction results have upgraded it to one of the target areas in China,therefore a systematic study of metallogenic planning and exploration deployment are on demand.With the prospecting progress and assessment results as the basis,this study redefined a new metallogenic belt and named it the Jin-Ji Al-Fe-Au-Pb-Zn-Ag-Cu-coal metallogenic belt.Combined with the analysis of regional geology setting and previous results in this area,we divided the study area into ten sub-metallogenic belts,and preliminarily established the metallogenic lineage of this metallogenic belt.The mineralization in this area is characterized by multiple stages,multiple systems, multi-cycle,inheritance and superimposition in the spatial evolution. The main metallogenic epoches are Precambrian,Cambrian-late Permian,late Triassic-late Cretaceous,and the Cenozoic,of which the late Jurassic-early Cretaceous was the metallogenic outbreak period of endogenic ore deposits.Metallogenesis in study area are complex.A variety of deposits occur in this belt,including magmatic deposits,such as magmatic,porphyry,skarn, marine or terrestrial volcanic, magma hydrothermal type and quartz vein type;metamorphic deposits,such as metamorphosed sedimentary and greenstone formation;strata bounded deposits,such as carbonate mesothermal type;sedimentary metallogenesis,such as marine or terrestrial sedimental,sandstone,weathering crust and so forth.Combined with regional prospecting progress and the latest potential assessment achievements,it is proposed in this study that bauxite,iron,gold,manganese,molybdenum,copper,lead,zinc and coal have big potential and should be main target minerals of next exploration deployment.Besides,26 key prospecting areas were defined in the belt,which will have some guiding for next exploration deployment.