南秦岭宁陕—镇安一带钨钼金矿田燕山期立交桥式构造—岩浆—流体叠加成矿的发现与意义  

DISCOVERY AND SIGNIFICANCE OF DEEP PROSPECTING OF LATE INDOSINIAN-YANSHANIAN INTRACONTINENTAL OROGENIC OVERPASS STRUCTURE MAGMATIC FLUID SUPERPOSITION MINERALIZATION IN NINGSHAN-ZHEN′AN TUNGSTEN MOLYBDENUM GOLD FIELD IN SOUTH QINLING

作　　者：杨兴科[1] 何虎军[1] 晁会霞[1] 韩珂[1] 刘向伟 朱伟 魏丽 贾凤仪 Yang Xing-ke;He Hu-jun;Chao Hui-xia;Han Ke;Liu Xiang-wei;Zhu Wei;Wei Li;Jia Fengyi(School of Earth Science and Resources,Chang′an University,Xi′an 710054;Shaanxi Mineral Geological Survey Center,Xi′an 710064;Shaanxi Geological Survey and Planning Research Center,Xi′an 710064;Shaanxi Geology and Mineral First Geological Team Co.,Ltd.,Ankang 725000)

机构地区：[1]长安大学地球科学与资源学院,西安710054 [2]陕西省矿产地质调查中心,西安710064 [3]陕西省地质调查规划研究中心,西安710064 [4]陕西地矿第一地质队有限公司,安康725000

出　　处：《陕西地质》2021年第2期33-41,共9页Geology of Shaanxi

基　　金：中国地质调查局国家整装勘查研究项目“陕西石泉—旬阳金矿整装勘查区关键基础地质研究”(12120114014201:04—025—063);“陕西石泉—旬阳金矿整装勘查区专项填图与技术应用示范”(12120114014201:02—09—01—063);陕西省地勘基金项目“镇安西部矿集区岩浆作用与钨钼成矿研究”(0617—1711FY1808);“秦岭成矿带典型矿集区成果集成与技术支撑研究”(61201506280);中央高校科研项目“秦岭陆内造山成矿作用与找矿建模研究”(310827173702)。

摘　　要：南秦岭成矿带镇安西部钨钼金多金属矿田发现多有晚印支—燕山期多期构造—岩浆—热液流体叠加成矿富集现象。经过近几年国家和陕西省整装勘查区找矿会战调研及成果集成综合研究发现,该区带经历了新元古代、加里东期、华力西期、印支期、燕山期和喜马拉雅期多期构造运动及其相应的成岩成矿叠加富集事件。对宁陕—镇安西部一带钨钼金矿集区或多金属矿田而言,其主要是受到印支晚期—燕山期发生的陆内造山期#型立交桥式多期构造—岩浆—气液叠加富集成矿事件,影响较为显著。且主要是在宁陕—镇安—山阳—柞水—旬阳北部一带形成了许多与中酸性小岩体或隐伏花岗岩斑岩—矽卡岩—远端浅成中低温热液型有关的钨钼金矿床。通过多个项目调研和成果集成,我们识别出一组成岩成矿时代主要在侏罗纪,且与隐伏花岗质岩浆活动有关的斑岩—矽卡岩—远端浅成中低温热液型矿床,矿床可分为:东阳式、桂林沟式、月河坪式、付家沟式、观花坪式、东川式六类。成矿时代主要集中在早侏罗世200~190 Ma,成矿模式具有“井”字形立交桥式成矿叠加富集特征。这是南秦岭带发现的以燕山期为主的陆内造山期钨钼金成矿作用事件,具有其特殊的侏罗纪陆内造山叠加富集成矿构造背景和作用过程。燕山期陆内造山成矿动力学转换的特殊背景、构造—岩浆—热液流体演化过程和热力作用叠加深部找矿的科学意义十分重要。The W-Mo-Au polymetallic orefield in the west of Zhen′an in the South Qinling metallogenic belt has been found to have multi-stage mineralization and enrichment of Late Indosinian Yanshanian multi-stage tectonic magmatic hydrothermal fluid superposition.In recent years,the national and Shaanxi integrated exploration area has experienced multi-stage tectonic movements and corresponding diagenetic and metallogenic superimposed enrichment events in Neoproterozoic,Caledonian,Variscan,Indosinian,Yanshanian and Himalayan.For the tungsten molybdenum gold concentration area or polymetallic orefield in the western area of Ningshan-Zhen′an,it is mainly affected by the multi-stage tectonic magmatic gas-liquid superposition enrichment mineralization event of intracontinental orogenic overpass in the Late Indosinian Yanshanian period.Many tungsten molybdenum gold deposits related to medium acid small rock mass or concealed granite porphyry skarn distal epithermal type have been formed mainly in the northern area of Ningshan-Zhen′an-Shanyang-Zhashui-Xunyang.Through the investigation and integration of several projects,we have identified a group of porphyry-skarn-distal epithermal deposits with diagenetic and metallogenic age mainly in Jurassic and related to concealed granitic magmatism.The tungsten molybdenum lead-zinc-gold deposits can be divided into six types:Dongyang type,Guilin Gou type,Yueheping type,Fujiagou type,Guanhuaping type and Dongchuan type.The metallogenic age is mainly concentrated at 200~190 Ma in the early Jurassic,and the metallogenic model has the characteristics of“well”shaped overpass metallogenic superposition and enrichment.This is an intracontinental orogenic tungsten molybdenum gold mineralization event dominated by Yanshanian found in the South Qinling belt,which has its special Jurassic intracontinental orogenic superposition enrichment metallogenic tectonic background and process.The special background of metallogenic dynamic transformation of Yanshanian intracontinental orogeny,the evo

关 键 词：南秦岭宁陕—镇安西部 钨钼金矿田 构造—岩浆—热液流体成矿 立交桥式叠加成矿 侏罗纪成矿事件 燕山期 陆内造山期 

分 类 号：P618.51[天文地球—矿床学] P618.6[天文地球—地质学]