冀东幔枝构造成矿作用及其地质找矿分析  

Mineralization and Geological Prospecting Analysis of Mantle Branch Structures in Eastern Hebei Province

作　　者：牛树银 陈超 张福祥 王丰翔 马宝军 王晨光 孙爱群 胡华斌 NIU Shu-yin;CHEN Chao;ZHANG Fu-xiang;WANG Feng-xiang;MA Bao-jun;WANG Chen-guang;SUN Ai-qun;HU Hua-bin(Hebei GEO University,Shijiazhuang 050031,China)

机构地区：[1]河北地质大学,河北石家庄050031

出　　处：《河北地质大学学报》2023年第4期2-15,共14页Journal of Hebei Geo University

基　　金：河北省自然科学基金项目(D2015403013);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：简要回顾了从“变质核杂岩→盆山耦合→一盆多山→地幔热柱→地幔亚柱→幔枝构造”等研究过程,逐步完善成为幔枝构造成矿控矿理论体系。幔枝构造是地幔热柱多级演化的第三级单元,它不仅是陆内伸展构造的一种常见构造形式,也是重要的成矿控矿构造。深源含矿流体通过地幔热柱—地幔亚柱—幔枝构造—有利构造扩容带,迁移到幔枝构造的脆韧性—韧脆性主、次级拆离带,侵入岩体的内、外接触带,密集的构造裂隙带,多种脉岩与围岩的接触带等有利构造部位集聚成矿。在河北省建立了若干个幔枝构造,由于篇幅所限,仅解剖了冀东幔枝构造不同部位、不同成矿类型。核部是杂岩控矿—金厂峪金矿,侵入接触小岩体控矿—峪耳崖金矿,以及上盘盖层拆离带控矿—尖宝山金矿,探讨其核部岩浆-变质杂岩、外围拆离滑脱层以及上叠断陷盆地的成矿作用,确定找矿方向,总结成矿规律,归纳成矿模式,指导新一轮地质找矿。This study briefly reviews the research processes from"metamorphic core complex→basin mountain coupling→multiple mountains in one basin→mantle plume→mantle sub-plume→mantle branch structure",and gradually improves the theoretical system of ore-controlling caused by mantle branch structure.Mantle branch structure is the third level unit of multistage evolution of mantle plume.It is not only a common structural form of intracontinental extensional tectonics,but also an important ore forming and ore controlling structure.The ore bearing fluid from deep source migrates to the brittle-ductile,ductile-brittle main and secondary detachment zones of the mantle branch structure,the inner and outer contact zones of intrusive rock bodies,the dense structural fracture zones,the contact zones between various vein rocks and wall rocks,and other favorable structural parts to concentrate mineralization through the mantle plume,mantle sub-plume,mantle branch structure and its favorable structural expansion zone.Several mantle branch structures have been established in Hebei Province,but due to space limitations,only different parts and mineralization types of mantle branch structures in Eastern Hebei have been dissected.Take Jinchangyu gold deposit,Yu'erya gold deposit and Jianbaoshan gold deposit respectively as the core,intrusive contact on small rock bodies and surrounding rock,detachment zone between base and cover layer deposit for examples,it researches on the mineralization of the core magma metamorphic complex,peripheral detachment layer,and overlying fault basin,determines the prospecting direction,summarizes the metallogenic regularities,summarizes the mineralization models,and guides a new round of geological prospecting.

关 键 词：幔枝构造 地幔亚柱 地幔热柱 成矿作用 成矿规律 找矿方向 冀东地区 

分 类 号：P611[天文地球—矿床学]