摘要
老挝是东南亚地区多金属矿产的重要产地,本文首次依据老挝全境1:100万地球化学填图数据,初步研究了老挝铜地球化学地球化学背景和空间分布特征,圈定了老挝地球化学异常,主要取得了如下结论:1)老挝水系沉积物铜含量分布范围在1.20×10^-6~459.00×10^-6,平均值21.96×10^-6,背景值16.50×10^-6,不同构造单元中铜含量而言,长山地块和各类缝合带上的铜元素平均值和中位值显著大于其他构造单元;2)老挝铜的地球化学图显示,其铜元素分布不均,总体上表现为北部较高,南部较低的格局;3)用含量累计频率85%(33.1×10^-6)为异常下限,全老挝境内圈定铜元素地球化学异常13处,其中4处达地球化学省规模(>1000 km^2),为老挝铜矿成矿远景区划分和勘查提供了基础性资料。
Laos is an important production country for metallic ores in Southeast Asia.Lao’s National-scale Geochemical Mapping Project has provided insight into understanding geochemical background,spatial distribution and potential targets for copper ore deposits.This paper has primarily reached the following conclusions:1)The copper concentration ranges from 1.20×10^-6 to 459.00×10^-6,and the background value is 16.50×10^-6,21.96×10^-6 on average.In terms of copper content of different tectonic units in Laos,the average value and median value of copper in Changshan block and other types of sutures are significantly higher than the values of other tectonic units;the major types of copper deposits are skarn type,hydrothermal type and porphyry type,which are mainly controlled by magmatic,hydrothermal and structural conditions;2)The geochemical map of copper of Laos shows that the distribution of copper elements is uneven,being high in the north and low in the south;3)Totally 13 copper geochemical anomalies are delineated by threshold of 33.1×10^-6,4 of which have reached the scale of geochemical provinces with an area of>1000 km^2 for each,thus providing the potential target areas for copper exploration and development of Laos.
作者
王玮
王学求
张必敏
聂兰仕
Sounthone LAOLO
Phomsylalai SOUKSAN
周建
刘汉粮
韩志轩
刘东盛
迟清华
徐善法
WANG Wei;WANG Xue-qiu;ZHANG Bi-min;NIE Lan-shi;Sounthone LAOLO;Phomsylalai SOUKSAN;ZHOU Jian;LIU Han-liang;HAN Zhi-xuan;LIU Dong-sheng;CHI Qing-hua;XU Shan-fa(Key Laboratory of Geochemical Exploration,Ministry of Natural Resources,Institute of Geophysical and Geochemical Exploration,Chinese Academy of Geological Sciences,Langfang,Hebei 065000;UNESCO International Centre on Global-scale Geochemistry,Langfang,Hebei 065000;Ministry of Natural Resources and Environment,Lao People's Democratic Republic,Vientiane,Laos 01000)
出处
《地球学报》
EI
CAS
CSCD
北大核心
2020年第6期861-867,共7页
Acta Geoscientica Sinica
基金
中国地质调查局地质调查项目(编号:DD20190450)
国家重点研发计划项目(编号:2016YFC0600600)联合资助。
关键词
老挝
铜
地球化学填图
地球化学背景
地球化学异常
Laos
copper
geochemical mapping
geochemical background
geochemical anomalies
