| A Microscopic and Nanoscale Understanding of the Formation of Gold Geochemical Provinces |
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| 作者姓名： | YE Rong WANG Xueqiu and ZHANG Bimin |
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| 作者单位： | 1 School of the Earth Sciences and Resources, China University of Geosciences, Beijing 100083, China
2 Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences,Langfang 065000, Hebei, China
3 Key Laboratory of Geochemical Exploration, Ministry of Land and Resources of P.R.China, Langfang 065000, Hebei, China |
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| 基金项目： | The research is financially supported by the program of Deep Exploration in China (Sinoprobe). Many thanks are given to all the participants in the projects of China Geochemical Baselines (Sinoprobe-04-01) and Deep-penetrating Geochemical Exploration (Sinoprobe-04-03). |
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| 摘 要： | Gold geochemical provinces in China were delineated through stream sediment or catchment sediment sampling in this study. Each gold geochemical province delineated by a threshold value of 2.5 ng/g covers an area of thousands of kilometers. It is a dilemma that geochemists traditionally thought that gold could not migrate for a long distance in rivers or streams to form a large-scale geochemical anomaly due to its chemical inertness and high specific density. The quantitative spectroscopic analysis and observations under a scanning electron microscope(SEM) indicate the presence of submicroscopic gold particles(5 μm in diameter) in large quantities, and observations under a Transmission Electron Microscopy(TEM) further suggest the presence of nanoscale gold particles(several tens of nanometre in diameter) in ores, rocks, soils and stream sediments. Particularly, submicroscopic and nanoscale gold particles less than 5 μm were only found in samples having a low gold content(10ng/g). This result shows that geochemical provinces, delineated by a threshold value of 2.5 ng/g, are formed by long-distance transport of ultrafine gold in streams. The findings may provide direct microscopic evidence for gold migration to form geochemical provinces.
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| 关 键 词： | 地球化学省 纳米尺度 黄金 微观 水系沉积物 扫描电子显微镜 透射电子显微镜 地球化学异常 |
| 收稿时间： | 2013/11/25 0:00:00 |
| 修稿时间： | 2014/1/27 0:00:00 |
A Microscopic and Nanoscale Understanding of the Formation of Gold Geochemical Provinces |
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| Authors: | YE Rong ;WANG Xueqiu ;ZHANG Bimin |
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| Institution: | [1]School of the Earth Sciences andResources, China University ofGeosciences, Beijing 100083, China; [2]Institute of Geophysical and Geochemical Exploration, Chinese Academy of Geological Sciences, Langfang 065000, Hebei, China; [3]Key Laboratory of Geochemical Exploration, Ministry of Land and Resources of P.R. China, Langfang 065000, HebeL China |
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| Abstract: | Gold geochemical provinces in China were delineated through stream sediment or catchment sediment sampling in this study. Each gold geochemical province delineated by a threshold value of 2.5 ng/g covers an area of thousands of kilometers. It is a dilemma that geochemists traditionally thought that gold could not migrate for a long distance in rivers or streams to form a large‐scale geochemical anomaly due to its chemical inertness and high specific density. The quantitative spectroscopic analysis and observations under a scanning electron microscope (SEM) indicate the presence of submicroscopic gold particles (<5 μm in diameter) in large quantities, and observations under a Transmission Electron Microscopy (TEM) further suggest the presence of nanoscale gold particles (several tens of nanometre in diameter) in ores, rocks, soils and stream sediments. Particularly, submicroscopic and nanoscale gold particles less than 5 μm were only found in samples having a low gold content (<10ng/g). This result shows that geochemical provinces, delineated by a threshold value of 2.5 ng/g, are formed by long‐distance transport of ultrafine gold in streams. The findings may provide direct microscopic evidence for gold migration to form geochemical provinces. |
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| Keywords: | Gold Geochemical Provinces Formation Mechanism Microscopic particles nanoscaleparticles |
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