冀东幔枝构造与金成矿作用  

Mantle Branch Structure and Gold Metallogenic in Eastern Hebei Province

作　　者：王晨光 王丰翔 郭海全 吕水 陈超 牛树银 王磊 任建红 WANG Chen-guang;WANG Feng-xiang;GUO Hai-quan;LV Shui;CHEN Chao;NIU Shuyin;WANG Lei;REN Jian-hong(Hebei Key Laboratory of Strategic Critical Mineral Resources,Shijiazhuang 050031,China;Hebei GEO University,Shijiazhuang 050031,China;Geological Exploration Technology Center,Hebei Bureau of Geology and Mineral Resources Exploration,Shijiazhuang 050081,China;The Fifth Geological Brigade of Hebei Bureau of Geology and Mineral Resources Exploration(Heibei Marine Geological Environment Survey),Tangshan 063000,China;Hebei Key Laboratory of Green Development of Rock and Mineral Materials,Shijiazhuang 050031,China)

机构地区：[1]河北省战略性关键矿产资源重点实验室,河北石家庄050031 [2]河北地质大学,河北石家庄050031 [3]河北省地质矿产勘查开发局地质勘查技术中心,河北石家庄050081 [4]河北省地质矿产勘查开发局第五地质大队(河北省海洋地质环境调查中心),河北唐山063000 [5]河北省岩石矿物材料绿色开发重点实验室,河北石家庄050031

出　　处：《河北地质大学学报》2023年第4期16-28,共13页Journal of Hebei Geo University

基　　金：河北地质大学2023年国家预研项目(QN202302);河北省战略性关键矿产资源重点实验室开放基金(HGU-SCMR2241);河北省岩石矿物材料开发重点实验室开放基金课题(RM202311);河北省高校基本科研业务费资助(QN202226);河北地质矿产勘查开发局科研项目(13000022P00329410103R);河北科技厅重点研发项目(22374201D)。

摘　　要：冀东地区是中国重要的金矿集区,大、中型矿床、矿点众多,开采历史悠久,当前面临进一步增储扩产压力。为更好地总结冀东地区金成矿规律,以利于指导下一轮地质找矿,在大量搜集前人研究资料基础上,以幔枝构造理论新视角,结合华北克拉通破坏、壳幔相互作用等深部过程研究进展,分析了冀东幔枝构造不同构造单元金矿地质特征和矿床同位素地球化学特征,总结金矿类型和成矿规律,讨论了幔枝构造的演化、壳幔相互作用背景下,冀东地区金成矿的深层次控制因素。综合分析表明,冀东幔枝构造各单元均有不同特点的代表性金矿产出,区内金矿主要产于核部中酸性岩体内部及外围接触带以及盖层—拆离带和火山-沉积盆地地层中,断裂控矿为主要特征,金成矿物质主要来源于下地壳和地幔,成矿流体以岩浆流体为主,多数含有地幔组分,成矿作用主要发生于印支期和燕山期。本区金矿可划分为石英脉型、斑岩型、隐爆角砾岩性、矽卡岩型、卡林型金矿等金矿类型,古太平洋板块的俯冲及回转,引起的软流圈物质上涌,强化冀东幔枝构造深部壳幔相互作用,引起了地壳深部强烈的岩浆和物质活动,最终富矿岩浆流体在早期构造空间就位沉淀形成冀东地区大量的金矿。Eastern Hebei region is an important gold mining area in China,with many large and medium-sized deposits and mining points,and a long mining history,and is currently facing the pressure of further increasing reserves and expanding production.In order to better summarize the gold mineralization law in Eastern Hebei and help guide the next round of geological prospecting,this paper analyzes the geological characteristics of gold ore and isotopic geochemical characteristics of different structural units of the mantle branch structure in Eastern Hebei on the basis of collecting a large number of previous research data,combines the research progress of deep processes such as destruction of the North China craton and crust-mantle interaction,summarizes the gold ore types and mineralization origins,and discusses the deep-seated control factors of gold mineralization in Eastern Hebei under the background of mantle branch structure evolution and crust-mantle interaction.Comprehensive analysis shows that each unit of the Eastern Hebei mantle branch structure has different characteristics of representative gold ore production,gold ore in the area is mainly produced in the inner and peripheral contact zone of acid rock mass in the core and the cap-disassembly zone and volcano-sedimentary basin strata,fault control ore is the main feature,gold minerals mainly come from the lower crust and mantle,the mineralization fluid is mainly magmatic fluid,most of them contain mantle components,mineralization mainly occurs in the Indo-Chinese epoch and Yanshanian period.The gold mines in this area can be divided into quartz vein type,porphyry type,cryptoexplosion breecia type,skarn-type and Carlin-type gold ore types,The asthenosphere material upwelling caused by the subduction and rotation of the paleo-Pacific plate strengthened the deep crust-mantle interaction of the Eastern Hebei mantle branch structure,caused strong magmatic and material activities in the deep crust,and finally the Au-rich magmatic fluid precipitated in the early te

关 键 词：冀东 幔枝构造 金 成矿作用 

分 类 号：P611[天文地球—矿床学]