胶东西北部金矿集中区深部控矿构造探讨  

Discussion on the Deep Dynamic Mechanism of Gold Mineralization Concentration Area in northwestern Jiaodong

作　　者：牛树银[1,2] 孙爱群[1] 张建珍[1] 马宝军[1] 王宝德[1] 陈超[1,2] 张福祥[1] 刘成[1] 张晓飞[1] 

机构地区：[1]石家庄经济学院资源学院,石家庄050031 [2]中国地质大学(北京)地球科学与资源学院,北京100083

出　　处：《地质学报》2011年第7期1094-1107,共14页Acta Geologica Sinica

基　　金：我国典型金属矿科学基地研究(编号200911007);国家自然科学基金(编号40872137)资助的成果

摘　　要：胶西北不足全国国土面积0.25%的成矿集中区却占有接近全国25%的黄金储量。该区不仅黄金储量巨大,而且成矿时间集中(115±5Ma),并具有矿脉延深远大于延长的特点,因此备受国内、外地质学家的广泛关注。研究认为,胶西北金矿集中区与深部控矿构造有关。华北东部地区在经历了古生代漫长的稳定地台演化阶段后,于燕山运动时期进入地幔热柱演化阶段,胶东恰好位于地幔热柱的中心部位。而胶西北成矿集中区则进入了以莱阳—莱西地幔亚热柱与其外围郭家店、岐山、盘石店等幔枝构造的发展演化阶段。深源金元素以气态-气液混合态-含矿流体的形式,通过地幔热柱→地幔亚热柱→幔枝构造→有利构造扩容带,迁移到幔枝构造的韧脆性-脆韧性剪切带、侵入岩体的内、外接触带、密集的构造裂隙带、各种脉岩与围岩的接触带等有利部位集聚成矿,从而构成环绕莱阳—莱西地幔亚热柱外带的旧店—夏甸—大尹格庄—栖霞—乳山等成矿集中带,内带的吉戈庄—三山岛—焦家—玲珑—大柳行—解甲庄—曲河庄等成矿集中带,并构成矿田→矿床→矿体(脉)排列有序组合。Nearly 25% of gold reserves in China distributes in northwestern Jiaodong,which has an area less than 0.25% of the national land area.Northwestern Jiaodong not only has the greatest gold reserves in China,a concentratived metallogenic time at 115±5Ma,but is characterized by gold-bearing veins,vertical extensions of which are larger than those of horizontal extension.Therefore,they have drawn much attention from geologists both in China and abroad.Our study indicates that Au ore intensive district in northwestern Jiaodong is related to deep ore-controlling structures.After experiencing evolution of long stable platform during Paleozoic,the eastern area of North China Platform entered the stage of mantle plume evolution in Yanshanian movement period.The Jiaodong was located exactly in the center of the mantle plume.Meanwhile,northwestern Jiaodong developed a series of mantle branches such as Guojiadian,Qishan and Panshidian around the Laiyang-Laixi sub-mantle plume.Through mantle plume→sub-mantle plume→mantle branch→favorable structural expanding zones,deep derived gaseous or gas-liquid Au-bearing hydrothermal fluid migrated to the ductile-brattle or brattle-ductile zones,internal or external contact zones of intrusives,dense structural fractures,contact zones between dykes and country rocks,forming a series of gold deposits.This produced an external ore intensive zone containing Jiudian-Xiadian-Dayinggezhuang-Qixia-Rushan deposits surrounding the Laiyang-laixi mantle plume,and an internal ore intensive zone consisting of Jigezhuang-Sanshandao-Jiaojia-Linglong-Daliuhang-Xiejiazhuang-Quhezhuang deposits.Both ore intensive zones consitiute a series of orefield-ore deposits-ore veins assemblages.

关 键 词：地幔热柱 幔枝构造 控矿构造 成矿作用 找矿方向 胶西北地区 

分 类 号：P618.51[天文地球—矿床学]