坦桑尼亚水系沉积物地球化学特征及金资源前景  被引量:1

Geochemical characteristics of stream sediment in Tanzania and prospective analysis of gold resources

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作  者:孙凯 刘晓阳 何胜飞 龚鹏辉 许康康 任军平 张航 卢宜冠 邱磊 SUN Kai;LIU Xiaoyang;HE Shengfei;GONG Penghui;XU Kangkang;REN Junping;ZHANG Hang;LU Yiguan;QIU Lei(Tianjin Center,CGS,Tianjin 300170,China;Southern Africa Mining Research Center,CGS,Tianjin 300170,China;School of Earth Science and Resources,China University of Geosciences(Beijing),Beijing 100083,China)

机构地区:[1]中国地质调查局天津地质调查中心,天津300170 [2]中国地质调查局南部非洲矿业研究所,天津300170 [3]中国地质大学(北京)地球科学与资源学院,北京100083

出  处:《地质通报》2023年第8期1258-1275,共18页Geological Bulletin of China

基  金:中国地质调查局项目《非洲中东部大型铜-钴资源基地评价》(编号:DD20190439);《海上丝绸之路非洲中东部7国矿产资源潜力评价》(编号:1212011220910);《南部非洲国际合作地质调查》(编号:DD20230125)。

摘  要:坦桑尼亚地形景观丰富,大部分地区基岩出露条件较好,水系发育。在坦桑尼亚开展国家尺度(1:100万)水系沉积物地球化学调查,首次查明了坦桑尼亚全国地球化学背景,明确了各元素分布区特定的地质地球化学意义。共采集4258件水系沉积物样品,采用ICP-MS、XRF等13种配套分析方法分析71种元素(化合物)的含量。分析结果表明,Au异常主要位于维多利亚湖区绿岩带内,在周边的活动带中存在富金地体的延伸。中温和中—高温成矿元素Ag、Cu、Pb、Zn和W、Sn、Mo、Nb、Ta异常主要分布在基巴拉锡成矿带、玛拉嘎拉西台地和新生代裂谷火山岩中;Ni、Co、Cr、V等元素异常主要分布于西部的玛拉嘎拉西台地、乌本迪带和新生代裂谷火山岩中,主要与基性—超基性岩体有关。共圈定金地球化学块体31处,金成矿远景区8处,采用地球化学块体法初步评价了金的资源潜力,为进一步在坦桑尼亚开展金矿及其他矿产勘查和基础研究提供了有利信息。Various landscapes are found in Tanzania.Bedrocks are well-exposed and streams are well-grained in most areas.This paper has ascertained the geochemical background of Tanzania,clarified the specific geological and geochemical significance of elements-rich area,by conducting national scale(11000000)stream sediment geochemical mapping.This work has collected 4258 samples in total.71 elements for each sample are analyzed by matched 13 analytic methods,including ICP-MS and XRF.The results show that the Au anomaly is distributed mainly in the greenstone belt of Lake Victoria,and there is a continuation of gold-rich terrain in the surrounding mobile belt.Medium and medium-high temperature metallogenic elements such as Ag,Cu,Pb,Zn,W,Sn,Mo,Nb and Ta anomalies are mainly distributed in the Kibara tin metallogenic belt,Malagarasi platform and volcanic rocks of East African Rift System(EARS).The anomalies of Ni,Co,Cr and V are mainly related to mafic-ultramafic rocks which are located in the Malagarasi platform,Ubendian Mobile Belt and volcanic rocks of EARS.This study delineates 31 gold geochemical blocks and 8 gold metallogenic prospective areas,and gold resource potential is preliminaries evaluated by geochemical block method.It provides favorable information for development of gold and other mineral exploration and fundamental research in Tanzania.

关 键 词:水系沉积物 资源前景 坦桑尼亚 地质调查工程 

分 类 号:P618.51[天文地球—矿床学]

 

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