Tungsten mineralization during slab subduction: A case study from the Huxingshan deposit in northeastern Hunan Province, South China
| Autor: | Anhuai Lu, Bin Li, Kai-Lang Wang, Jianqing Lai, Alexander Rocholl, Jiantang Peng, Jeffrey M. Dick, Jun-Wei Xu |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
geography
Fractional crystallization (geology) geography.geographical_feature_category 020209 energy Continental crust Geochemistry Tungsten ore Geology Skarn 02 engineering and technology Massif 010502 geochemistry & geophysics 01 natural sciences Geochemistry and Petrology Greisen 0202 electrical engineering electronic engineering information engineering Economic Geology Fluid inclusions 0105 earth and related environmental sciences Zircon |
| Zdroj: | Ore Geology Reviews |
| ISSN: | 0169-1368 |
| DOI: | 10.1016/j.oregeorev.2020.103657 |
| Popis: | The Huxingshan tungsten deposit (~0.21 Mt at 0.3 wt% WO3) is located in the Jiangnan Massif tungsten ore belt, South China. Here, the W mineralization is restricted to quartz and muscovite-quartz veins intruding variable country rocks of the Lower Cambrian strata. Rb-Sr isochron ages derived from fluid inclusions trapped in muscovite-quartz veins (ca. 134 ± 2 Ma) agree with the zircon U–Pb crystallization age of the associated Huxingshan granite (137.8 ± 0.5 Ma) and may thus suggest a close petrogenetic relationship between both rock types. Zircon eHf (t) values of the Huxingshan granite (−16.2 to +6.6) overlap with those of the specially related metasedimentary Banxi and Lengjiaxi Groups, consistent with melting of Neoproterozoic Yangtze lower crustal materials with mantle melts input to the source. We suggest that the highly differentiated signatures of tungsten and beryllium granite might be inherited from the origin chemistry of source rocks and further modified by highly fractional crystallization rather than by fluid-rock interaction processes. During this process, tungsten and beryllium was enriched in the residual melts/fluids, which finally separated from the solidifying melt body and were introduced into the county rock to precipitate scheelite and beryl along skarn and greisen horizons by large-scale fluid movements. The outlined processes are likely to be coupled to large-scale melting of continental crust and associated granitic magmatism under a regime of subduction of the paleo-Pacific Plate beneath South China and subsequent tearing of the slab. The newly discovered Huxingshan deposit underlines the huge prospecting potential for the northwestern Jiangnan Massif. |
| Databáze: | OpenAIRE |
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