| 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 |
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| 关键词:Carlin-type gold ore districts of Yunnan–Guizhou–Guangxi stream sediment rock geochemistry gold |
| 基金项目:国家重点研发计划项目“穿透性地球化学勘查技术”(编号: 2016YFC0600600) |
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| 摘要: |
| The Concentrations and Temporal-spatial Distribution of Gold in Stream Sediments and Rocks in the Carlin Type Gold Ore Districts of Yunnan–Guizhou–Guangxi Region |
| In order to study the temporal-spatial distribution of gold resources in stream sediments and rocks and their spatial relationship with known reserves of gold deposits in the Carlin-Type gold ore districts of Yunnan–Guizhou–Guangxi region, the authors compiled geochemical distribution maps of gold in stream sediments and rocks based on geochemical data collected from 1: 200 000 Regional Geochemistry-National Reconnaissance Project and China Geochemical Baselines Project. Five gold geochemical provinces with an area of over 1000 km2 were delineated, which are spatially consistent with the distribution of the Carlin-Type gold deposits in this area. There are relatively higher gold background values in stream sediments and ore-hosting rocks (mudstone, shale, sandstone, limestone) in the Youjiang Basin (1.94×10–9, 0.51×10–9) than the values 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 study area. Gold geochemical provinces might have resulted from the mutual superposition of the rocks with high gold background value, gold mineralization, and secondary weathering of gold deposits. The results obtained by the authors contribute to judging the genesis of anomalies and identifying the existence of metallogenesis effectively, and play a key role in exploring the regular pattern of gold regional metallogeny and delineating prospecting targets. |
| ZHAO Dong-jie,WANG Xue-qiu.2020.The Concentrations and Temporal-spatial Distribution of Gold in Stream Sediments and Rocks in the Carlin Type Gold Ore Districts of Yunnan–Guizhou–Guangxi Region[J].Acta Geoscientica Sinica,41(3):407-419. |
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