| 半干旱—干旱地区以钙积层为采样介质的隐伏金矿地球化学勘查 |
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| 引用本文： | 王强,王学求,刘汉粮,刘东盛,严桃桃,迟清华.半干旱—干旱地区以钙积层为采样介质的隐伏金矿地球化学勘查[J].地质学报,2022,96(3):1104-1120. |
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| 作者姓名： | 王强 王学求 刘汉粮 刘东盛 严桃桃 迟清华 |
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| 作者单位： | 中国地质科学院地球物理地球化学勘查研究所,河北廊坊,065000;自然资源部地球化学探测技术重点实验室,河北廊坊,065000;联合国教科文组织全球尺度地球化学国际研究中心,河北廊坊,065000 |
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| 基金项目： | 本文为国家重点研发计划项目(编号 2016YFC0600600)、国家自然科学基金项目(编号 41903071)和中国地质调查局项目(编号 DD20190451)联合资助的成果。 |
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| 摘 要： | 在隐伏金矿的地球化学勘查中,常用的采样介质包括岩石、水系沉积物、土壤、植物和地气等.近几十年,澳大利亚在半干旱—干旱地区以钙积层作为隐伏金矿床地球化学勘查的采样介质,并取得了成功.本文对以钙积层作为隐伏金矿地球化学勘查采样介质的理论和勘查进展进行总结,其勘查理论基础是土壤剖面中金-钙高度相关性,其成因机理较合理地解释为...
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| 关 键 词： | 半干旱—干旱地区 隐伏金矿 地球化学勘查 采样介质 钙积层 |
| 收稿时间： | 2020/12/17 0:00:00 |
| 修稿时间： | 2021/1/9 0:00:00 |
Calcrete as a new sampling medium for geochemical exploration of concealed gold deposits in semi- arid and arid areas |
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| Wang Qiang,Wang Xueqiu,Liu Hanliang,Liu Dongsheng,Yan Taotao,Chi Qinghua.Calcrete as a new sampling medium for geochemical exploration of concealed gold deposits in semi- arid and arid areas[J].Acta Geologica Sinica,2022,96(3):1104-1120. |
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| Authors: | Wang Qiang Wang Xueqiu Liu Hanliang Liu Dongsheng Yan Taotao Chi Qinghua |
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| Abstract: | Commonly sampling media in gold geochemical exploration include rock, stream sediment, soil, plant, and gas. In recent decades, calcrete has been successfully used as a sampling medium in geochemical exploration of concealed gold deposits in semi- arid and arid areas in Australia. In this paper, the theory and advances in the use of calcrete as the sampling medium in geochemical exploration of concealed gold deposits are summarized. This method is based on the high correlation of gold with calcium in the soil profile. A probable explanation for the genetic mechanism is as follows: the weathering of primary gold deposits or mineralization forms various gold complexes, nano gold, and its colloids. Then, the dissolved gold and nano gold can be migrated from deep to shallow horizon by evaporation and transpiration, plant roots, electrochemistry, earth gas, seismic pumping, and other functions. In a wet sub- period, gold could form gold amino acid complex or gold colloid with the help of microbial breakdown of plant organic material. There is no correlation between gold and calcium in soils at early time; in drying sub- periods, the destabilization of gold amino acid complex or gold colloid gold results in co- deposition of gold and calcium. Finally, combined plant- microorganism- climate effect leads to form gold anomaly in calcrete. Notably, the research in China suggested that the contents of gold and calcium are not positively correlated since the presence of clay would promote gold enrichment, and the presence of plaster and calcium carbonate would prompt gold depletion; in addition, topography will also affect the formation of gold anomaly in calcrete. Therefore, it still needs to be tested if the method could be applied outside Australia. |
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| Keywords: | semi- arid and arid area concealed gold deposit geochemical exploration sample medium calcrete |
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