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Minerals 2018, 8(7), 265; https://doi.org/10.3390/min8070265

Metal Sources of World-Class Polymetallic W–Sn Skarns in the Nanling Range, South China: Granites versus Sedimentary Rocks?

1
Department of Resources Science and Engineering, Faculty of Earth Resources, China University of Geosciences, Wuhan 430074, China
2
Key Laboratory of Metallogenic Prediction of Nonferrous Metals and Geological Environment Monitoring, Ministry of Education, School of Geosciences and Info-Physics, Central South University, Changsha 410083, China
3
School of Earth and Planetary Science, John de Laeter Centre, TIGeR, Curtin University, Bentley, WA 6845, Australia
4
CAS Key Laboratory of Crust–Mantle Materials and Environments, School of Earth and Space Sciences, University of Science and Technology of China, Hefei 230026, China
*
Author to whom correspondence should be addressed.
Received: 25 May 2018 / Revised: 8 June 2018 / Accepted: 20 June 2018 / Published: 24 June 2018
(This article belongs to the Special Issue Polymetallic Metallogenic System)
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Abstract

Widespread, large-scale polymetallic W–Sn mineralization occurs throughout the Nanling Range (South China) dated 160–150 Ma, and related to widely developed coeval granitic magmatism. Although intense research has been carried out on these deposits, the relative contribution of ore-forming elements either from granites or from surrounding strata is still debated. In addition, the factors controlling the primary metallogenic element in any given skarn deposit (e.g., W-dominated or Sn-dominated) are still unclear. Here, we select three of the most significant skarn-deposits (i.e., Huangshaping W–Mo–Sn, Shizhuyuan W–Sn–Mo–Bi and Xianghualing Sn), and compare their whole-rock geochemistry with the composition of associated granites and strata. The contents of Si, Al and most trace elements in skarns are controlled by the parent granite, whereas their Fe, Ca, Mg, Mn, Ti, Sr and REE patterns are strongly influenced by the wall rock. Samples from the Huangshaping skarn vary substantially in elemental composition, probably indicating their varied protoliths. Strata at the Shizhuyuan deposit exerted a strong control during metasomatism, whereas this occurred to a lesser degree at Huangshaping and Xianghualing. This correlates with increasing magma differentiation and increasing reduction state of granitic magmas, which along with the degree of stratigraphic fluid circulation, exert the primary control on dominant metallogenic species. We propose that wall rock sediments played an important role in the formation of W–Sn polymetallic mineralization in South China. View Full-Text
Keywords: W–Sn skarn; whole-rock geochemistry; Huangshaping; Shizhuyuan; Xianghualing W–Sn skarn; whole-rock geochemistry; Huangshaping; Shizhuyuan; Xianghualing
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Jiang, W.; Li, H.; Evans, N.J.; Wu, J.; Cao, J. Metal Sources of World-Class Polymetallic W–Sn Skarns in the Nanling Range, South China: Granites versus Sedimentary Rocks? Minerals 2018, 8, 265.

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