| 穿透性地球化学在干旱戈壁荒漠覆盖区的应用——甘肃花牛山铅锌矿试验实例 |
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| 关键词:deep-penetrating geochemistry fine particle total measurement MOMEO CHIM Huaniushan Pb-Zn deposit |
| 基金项目: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);中国地质调查局地质调查项目(编号: 12120113100500; DD20190451; DD20190450) |
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| The Application of Deep-penetrating Geochemistry in the Arid Gobi Desert Terrain: A Case Study in the Huaniushan Pb-Zn Deposit, Gansu Province |
| The arid Gobi desert terrain is located in the northwest of China, where the three polymetallic metallogenic belts of Tianshan, Beishan and Qilian mountains pass through. The ore-forming conditions of this region are superior, and the potential for prospecting, especially in search for concealed mines, is enormous. However, it is difficult to obtain the mineralization information under the overburden due to the influence of aeolian sand. Deep-penetrating geochemical exploration methods were developed to solve the problems of how to get the information of the buried deposits in the covered layer, and the methods were successfully used to indicate some buried deposits, but not all kinds of deposits. Deep-penetrating geochemical exploration included fine particle total measurement, the selective leaching of mobile metals (MOMEO, measurement of ions derived from water soluble salts, measurement of ions and ultrafine particles adsorbed on clay minerals and measurement of ions and ultrafine particles occluded in Fe-Mn oxides), and geoelectric chemistry (CHIM) was carried out in the Huaniushan Pb-Zn deposit in the arid Gobi desert terrain. The results show that abnormal contrast of the data measured by these deep-penetrating geochemical methods is high, and the coefficient of variation is large. In addition geochemical anomalies delineated by these methods are located over the known orebodies and can be used to locate reliable prospecting targets. In comparison, the result of the fine particle total measurement is the best, the results of measurement of ions and ultrafine particles adsorbed on clay minerals, measurement of ions and ultrafine particles occluded in Fe-Mn oxides and geoelectric chemistry are better, and the result of measurement of ions derived from water soluble salts is relatively worse. So the selected methods are effective for finding concealed Pb-Zn deposits in the arid Gobi desert area. The findings of metallic nanoparticles under endogenous conditions in gas-solid media provide direct observation evidence for deep-penetrating geochemical methods using soil as sampling media (fine particle total measurement, MOMEO) in search for deeply concealed ore deposits. And the findings of a large number of micron-sized clay mineral particles in the geoelectric foam plastic carrier and the high consistency between major (Fe and Al) and trace elements’ anomalies infer that the anomaly of CHIM is caused by fine-grained clay mineral particles that exist in soil, and these particles can be adsorbed selectively by CHIM process. |
| LIU Han-liang,ZHANG Bi-min,WANG Xue-qiu,SUN Bin-bin,ZHANG Zhen-hai,LIU Dong-sheng.2021.The Application of Deep-penetrating Geochemistry in the Arid Gobi Desert Terrain: A Case Study in the Huaniushan Pb-Zn Deposit, Gansu Province[J].Acta Geoscientica Sinica,42(4):545-554. |
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