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首页> 外文期刊>Journal of Geochemical Exploration: Journal of the Association of Exploration Geochemists >Geochemical exploration for concealed deposits at the periphery of the Zijinshan copper-gold mine, southeastern China
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Geochemical exploration for concealed deposits at the periphery of the Zijinshan copper-gold mine, southeastern China

机译：中国东南部紫金山铜金矿外围隐伏矿床的地球化学勘探

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Geochemical exploration has focused on concealed deposits at the periphery of the Zijinshan Cu-Au mine, a volcanogenic hydrothermal-type deposit and one of the largest Au deposits in southeastern China. Recently, near the Zijinshan deposit, a concealed Ag-Au-U deposit was discovered below volcanic sequences in the Yueyang Basin to the east of Zijinshan and a blind porphyry Cu-Mo deposit was found in the Luoboling Basin to the west of Zijinshan. In this study, sampling of a soil profile was undertaken at a spacing of 25 m across the Yueyang Ag-Au-U mineralisation. Samples collected from the soil B horizon, generally at a depth of 5-30 cm, were then sieved to <75 mu m and analysed by near-total digestion (four-acid digestion) and selective leach partial digestion techniques in order to compare the effectiveness of the two methods. Later, additional geochemical research for concealed deposits was carried out across the Yueyang Ag-Au-U, Zijinshan Cu-Au, Wuziqilong Cu, and Luoboling Cu-Mo deposits. Sampling of soil profiles was undertaken at a spacing of 50-100 m. Samples were also sieved to <75 mu m and analysed by near-total digestion. The results show that (1) these two methods reveal similar geochemical anomalies and both effectively locate the concealed Ag-Au-U mineralisation in the Yueyang Basin, and (2) that the spatial distribution and suites of elements are consistent with the mineralisation types, i.e., Ag-Au anomalies occur above the Yueyang Ag-dominated polymetallic deposit, Cu-Au-Ag-As anomalies occur at the Zijinshan Cu-Au deposit, Cu-Ag-Au-As anomalies occur at the Wuziqilong Cu deposit, and Cu-Mo-W anomalies occur over the Luoboling Cu-Mo deposit. In addition, Au-Cu-bearing nanoparticles were observed in geogas from above a concealed Ag-Au mineralisation using a transmission electron microscope (TEM) equipped with energy dispersive spectroscopy. These results imply that fine-grained soils inherit Minerals derived from in situ weathering of surface rocks and can adsorb mineralisation-related elements migrating from underlying deep-seated ore bodies. Total and partial analysis of fine-grained soils can be used for geochemical exploration to locate concealed deposits in areas covered by barren rock sequences. (C) 2015 Elsevier B.V. All rights reserved.
机译：地球化学勘探的重点是紫金山铜金矿外围的隐蔽矿床，火山成因的热液型矿床和中国东南部最大的金矿床之一。最近，在紫金山矿床附近，紫金山以东的岳阳盆地火山序列下方发现了一个隐伏的Ag-Au-U矿床，在紫金山西侧的罗伯坪盆地发现了一个斑岩斑岩型铜钼矿床。在这项研究中，在岳阳Ag-Au-U矿化区的25 m处进行了土壤剖面采样。从土壤B层收集的样品通常在5-30 cm的深度进行筛分至<75μm，并通过近全消化（四酸消化）和选择性浸出部分消化技术进行分析，以比较两种方法的有效性。后来，对岳阳银金铀矿，紫金山铜金矿，五子旗龙铜矿和罗勃坪铜钼矿床进行了隐蔽矿床的其他地球化学研究。在50-100 m的间隔内对土壤剖面进行采样。样品也过筛至<75微米，并通过几乎完全消化的方法进行分析。结果表明：（1）这两种方法揭示了相似的地球化学异常，并且都可以有效地定位岳阳盆地隐蔽的Ag-Au-U矿化;（2）空间元素的分布和组成与矿化类型一致;即，Ag-Au异常发生在岳阳以Ag为主的多金属矿床之上，Cu-Au-Ag-As异常发生在紫金山Cu-Au矿床，Cu-Ag-Au-As异常发生在乌自旗龙Cu矿床，Cu -Mo-W异常发生在Luoboling Cu-Mo矿床上。此外，使用配备了能量色散光谱仪的透射电子显微镜（TEM），在隐蔽的Ag-Au矿化层上方的地气中观察到了含Au-Cu的纳米颗粒。这些结果表明，细粒土壤继承了表层岩石原位风化产生的矿物，并且可以吸收从下伏深部矿体中迁移出来的与矿化有关的元素。细粒土壤的全部和部分分析可用于地球化学勘探，以在贫瘠岩石层序覆盖的区域中定位隐蔽的沉积物。 （C）2015 Elsevier B.V.保留所有权利。

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