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[an error occurred while processing this directive]Jiaodong Gold Deposits:Essential Characteristics and Major Controversy
Received date: 2018-03-06
Revised date: 2018-04-16
Online published: 2018-10-17
Jiaodong has become the third largest gold ore concentration area in the world because of the break-through of gold exploration in recently.This basic characteristics of the spatial distribution,structural ore-controlling,mineralization and alteration of Jiaodong gold deposits were summarized,and the main controversial issues about the gold deposits were analyzed.Jiaodong gold deposits are distributed among the three metallogenetic sub-regions namely the Jiaoxibei,Qipengfu and Muru,and there are five main ore-controlling fault zones. The ore hosting geological bodies in the area are mainly Jurassic Linglong-type granitoid,followed by the early Cambrian metamorphic rocks and the Cretaceous Guojialing-type granitoid,and a small number of gold deposits occurred in the Cretaceous Laiyang group.The major types of gold minralization are altered-rock type in the fracture zone and gold-bearing quartz vein type,and next are braided quartz vein type along the fracture zones,quartz-sulphide vein type,interlayer type along the detachment belt,altered-conglomerate type,breccia type along the basin margin faults and carbonate vein type.The large-sized gold deposits are mostly altered-rock type,and the average grade of the medium and large-sized gold deposits is 4.07×10-6. Jiaodong gold deposits are strictly controlled by regional larger fault and its secondary fault.The ore-controlling tectonic pattern or position mainly include:turn around of the fracture,change parts of fracture angle,intersection part of multi-faults,intersect as small angle of faults,brush structures,the diamond ring structure combination,and echelon structure combination.The long-axis direction of oblique-arrange of gold orebodies that controlled by different fractures are distribution roughly the same straight line along the SW-NE direction.The gold deposits present the zoning characteristics of structure,alternation and mineralization,including cataclasitic zone of pyrite-sericite-quartz alteration,cataclasitic granitoid zone of pyrite-sericite-quartz alteration and potassic granitoid zone.The hydrothermal alteration minerals related to gold mineralization mainly include quartz,sericite,pyrite,chalcopyrite,galena,sphalerite,silver gold and natural gold.Though significant research has been conducted about Jiaodong gold deposits,there are the following key issues remain to be solved.(1)There are magmatic hydrothermal type,Jiaodong type,Cratonic destruction type or orogenic type for the understandings of the Jiaodong gold mineralization.(2)The understandings about the ore-forming geological bodies,the source of ore-forming material and fluid mainly include:Linglong type or Guojialing type granitoid played an important role in mineralization,and ore-forming fluid is the result of initial magmatic water;The ore-forming materials are diversity and complexity that derived from the Precambrian metamorphic basement rock mass which reactivated in the Mesozoic,and ore-forming fluids came from both the crust and mantle and are mainly the crust source metamorphic fluid;Mantle-derived lamprophyre associated with gold mineralization,and ore-forming fluid may be derived from the magma water that formed by the dehydration of the mantle-derived basic magma;The formation of Jiaodong gold deposits is related to the Weideshan type granitoid and its related dikes and volcanics.(3)The understandings about the metallogenic epoch of Jiaodong gold deposits are three main arguments:The isotopic age range is 123.0~110.6 Ma,and mostly are formed at (120±5)Ma;Jiaodong gold deposits formed in three period between 134 and 107 Ma;There are two metallogenic periods at 125~115 Ma and 100~90 Ma.
Mingchun SONG , Yingxin SONG , Zhengjiang DING , Shiyong LI . Jiaodong Gold Deposits:Essential Characteristics and Major Controversy[J]. Gold Science and Technology, 2018 , 26(4) : 406 -422 . DOI: 10.11872/j.issn.1005-2518.2018.04.406
本文基于山东省地质矿产勘查开发局所属地质勘查单位多年来的找矿成果及有关科研院校研究成果综合编写而成。审稿专家和编辑人员对本文提出了宝贵意见、建议并进行了细致修改。2018年是山东省地质矿产勘查开发局建局60周年,谨以此文献给为我国黄金事业作出巨大贡献的山东地矿干部职工。同时,衷心祝贺《黄金科学技术》杂志创刊30周年!
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