老挝1∶20万孔县幅(B.Khon)区域地质填图主要成果  

Main achievements of 1:200 000 regional geological mapping in B. Khon sheet of Laos

作　　者：李振江[1] 刘书生[2] 吴振波[2] 景志民 游水生 LI Zhenjiang;LIU Shusheng;WU Zhenbo;JING Zhimin;YOU Shuisheng(Geological Survey Team of Sichuan Geology and Mineral Bureau, Chengdu 610213, China;Chengdu Center of China Geological Survey, Chengdu 610081, China;Geochemical Exploration Team of Sichuan Geology and Mineral Bureau, Deyang 618000, China)

机构地区：[1]四川省地质矿产勘查开发局区域地质调查队,成都610213 [2]中国地质调查局成都地质调查中心,成都610081 [3]四川省地质矿产勘查开发局化探队,德阳618000

出　　处：《中国地质调查》2018年第6期48-57,共10页Geological Survey of China

基　　金：中国地质调查局"老挝;柬埔寨及邻区矿产资源潜力评价"二级项目所属子项目"老挝沙耶武里及邻区优势矿产资源潜力调查与分析(编号:12120114018701)""老挝1:20万孔县幅区域地质填图(编号:12120114018701-02)""老挝1:20万孔县幅区域地球化学调查(编号:121201010000150013-01)"项目联合资助

摘　　要：老挝1∶20万孔县幅是中、老两国政府合作项目,采用区域地质调查、区域地球化学调查等方法手段,查明了区域地层、岩石、构造及矿产的分布及特征,取得了一系列成果与进展:(1)系统建立了研究区地层序列及构造格架,新建石炭系—新近系14个组级岩石地层单位和石炭纪—二叠纪4个化石组合带;(2)查明研究区火山岩时代主要为石炭纪、早二叠世和中三叠世,提出莫卡兰扣(Ph. Mokkalangkou)断裂带为难河—程逸缝合带北延部分的认识,所夹超基性岩可能为蛇绿岩残片,对该区及邻区的地层、构造区划具有重要意义;(3)查明了研究区构造形迹的特征与分布,划分4个构造层及4个构造单元,总结出构造演化经历了6个阶段;(4)新发现铜、铅锌和金13处矿化点,通过水系沉积物测量圈定化探综合异常24处,系统总结了研究区含矿层位、成矿地质背景、成矿时代及成矿规律,划分了4个找矿远景区,对优势矿产资源潜力进行了初步分析。1∶200000regional geological mapping in B.Khon sheet of Laos is a cooperation project between Chinese and Laotian governments.Methods of regional geological survey and regional geochemical survey were used in this project,the distribution and characteristics of regional strata,rocks,structures and minerals were identified,and a series of achievements and progresses have been made:①The stratigraphic sequences and tectonic framework of the study area were systematically constructed,and14Carboniferous-Neogene lithostratigraphic units and4Carboniferous-Permian fusulinid fossil assemblage zones were newly established.②The period of volcanic rocks in this study area is mainly Carboniferous,Early Permian and Middle Triassic.The Ph.Mokkalangkou deep-seated fault zone is part of the northward extension of the Nan-Uttaradit suture zone,in which the ultrabasic rocks may be the relicts of ophiolites.This achievement is of great significance to the stratigraphic and tectonic division of the study area and adjacent areas.③The characteristics and distribution of the structures in the study area are identified,4tectonic level and4tectonic units were divided,and six stages of tectonic evolution were pointed out.④Thirteen new Cu,Pb-Zn and Au mineralization points were found.And24integrated geochemical anomalies were selected according to the stream sediment survey.Ore-bearing bed,ore-forming geological background,metallogenic epoch and metallogenic regularity were systematically summarized.Four metallogenic prospecting areas were divided and the potential of superior mineral resources was preliminarily analyzed.

关 键 词：区域地质调查 地球化学调查 难河-程逸缝合带 找矿远景区 孔县 老挝 

分 类 号：P622[天文地球—地质矿产勘探]