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Formation of the Fanshan lithocap and implications for exploration in the Luzong Basin, Anhui Province, China
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Abstract
Lithocaps in island-arc settings are genetically related to porphyry-epithermal systems and can be used to guideexploration for porphyry deposits. The Fanshan area of the Luzong basin in the eastern China, hosts a largelithocap but no porphyry or epithermal deposits have been found. The Fanshan lithocap in the Luzong basin iscentred on the Dafanshan alunite mining district with vuggy quartz–alunite–pyrite, quartz–dickite–kaolinite ± alunite, quartz–kaolinite and kaolinite–illite ± smectite from northeast to southeast. The alteration zoning reflects the gradual decrease in the temperatures and acidities of the fluids. Four types of aluniteincluding bladed alunite, needle alunite, granular alunite, and powdery alunite suggest that the Fanshan lithocapformed in the magmatic-hydrothermal and supergene environment. From the southwest to the northeast of theDafanshan district, Pb and 106Pb/(Na + K) in the alunite samples gradually decrease, Au content graduallyincreases, but the Cu content does not change significantly. The peak positions at 1480 nm and the Na content ofthe magmatic-hydrothermal alunite gradually increase, whereas Pb and 106Pb/(Na + K) in the alunite mineralsgradually decrease. This suggests that the source of the hydrothermal fluids and a potential zone of preciousmetal mineralization area may be in the northeast of the Dafanshan district, and the potential area of coppermineralization may be in the Huangtun area northeast of the Luzong basin.
| Item Type: | Article |
|---|---|
| Authors/Creators: | Li, X and Zhou, T and White, NC and Fan, Y and Zhang, LJ and Xie, J and Lui, Y |
| Keywords: | Fanshan lithocap, whole-rock geochemistry, alunite, LA-ICP-MS, magmatic hydrothermal, prospecting potential, Luzong basin |
| Journal or Publication Title: | Ore Geology Reviews: Journal for Comprehensive Studies of Ore Genesis and Ore Exploration |
| Publisher: | Elsevier |
| ISSN: | 0169-1368 |
| DOI / ID Number: | https://doi.org/10.1016/j.oregeorev.2020.103314 |
| Copyright Information: | © 2020 Elsevier B.V. All rights reserved. |
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