滇黔桂卡林型金矿区水系沉积物和岩石金含量与时空分布
投稿时间:2019-08-11  修订日期:2019-09-20  点此下载全文
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作者单位E-mail
赵东杰 中国地质科学院地球物理地球化学勘查研究所中国地质大学(北京) 471584737@qq.com 
王学求 中国地质科学院地球物理地球化学勘查研究所  
基金项目:国家重点基础研究发展计划(973计划)
中文摘要:为研究滇黔桂卡林型金矿区水系沉积物和岩石中金的地球化学时空分布及其与金矿规模的对应关系, 系统收集了该区1: 20万区域化探全国扫面计划水系沉积物和全国地球化学基准计划岩石金的地球化学数据, 绘制了水系沉积物和岩石金的地球化学分布图。滇黔桂卡林型金矿区以水系沉积物金地球化学异常面积大于1000km2 为准, 共圈定5处金的地球化学省, 这些金的地球化学省同时也是矿床大规模产出的部位。区内右江盆地水系沉积物金背景值(1.94×10-9)高于扬子克拉通(1.68×10-9), 其内以泥岩、页岩、砂岩、灰岩为代表的容矿岩石金背景值(0.51×10-9)也高于扬子克拉通(0.39×10-9)。研究区不同构造单元及沉积相中水系沉积物金背景值受岩石金背景值的制约。金的地球化学省是地壳演化过程中不均匀分布的高金背景岩石、金矿化作用及金矿床次生风化作用相互叠加的结果。该研究有助于有效判断异常成因、识别成矿作用存在, 对研究金的区域成矿规律和聚焦找矿靶区具有重要意义。
中文关键词:滇黔桂卡林型金矿区  水系沉积物  岩石  地球化学  
 
The Concentrations and Temporal-Spatial Distributions of Gold in Stream Sediments and Rocks in the Carlin Type Gold Deposits Area of Yunnan-Guizhou-Guangxi Provinces, China
Abstract:In order to study the temporal-spatial distributions of gold in stream sediments and rocks and their spatial relationship with known reserves of gold deposits in the Carlin-Type gold deposits area of Yunnan-Guizhou-Guangxi provinces, geochemical distribution maps of gold in stream sediments and rocks have been constructed in this paper based on the geochemical data collected from the 1: 200000 Regional Geochemistry-National Reconnaissance project and the China Geochemical Baselines project. Five gold geochemical provinces with the area of over 1000km2 have been outlined, which are spatially consistent with the distribution of the Carlin-Type gold deposits in this area. There are relative higher gold background values for stream sediments and ore-hosting rocks (mudstone, shale, sandstone, limestone) in the Youjiang Basin (1.94×10-9, 0.51×10-9) then that of the Yangtze craton (1.68×10-9, 0.39×10-9). The gold background values of stream sediments are constrained by those of rocks in various structural units and sedimentary facies in the sturdy area. Gold geochemical provinces could be resulted from the mutual superposition among the rock with high gold background value, gold mineralization, and secondary weathering of gold deposits. This research may draw a contribute to judge the genesis of anomalies, identify the existence of metallogenesis effectively, and has a key role to explore the regular pattern of gold regional metallogeny and focus on prospecting targets.
keywords:the Carlin-Type gold deposits area of Yunnan-Guizhou-Guangxi  stream sediment  rock  geochemistry  gold
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