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- Title
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.
- Authors
刘汉粮; 张必敏; 王学求; 孙彬彬; 张振海; 刘东盛
- Abstract
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.
- Publication
Acta Geoscientica Sinica, 2021, Vol 42, Issue 4, p545
- ISSN
1006-3021
- Publication type
Article
- DOI
10.3975/cagsb.2020.072601