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Science China Earth Sciences

, Volume 59, Issue 11, pp 2121–2141 | Cite as

A study on the Dushiling tungsten-copper deposit in the Miao’ershan-Yuechengling area, Northern Guangxi, China: Implications for variations in the mineralization of multi-aged composite granite plutons

  • WenDi Chen
  • WenLan ZhangEmail author
  • RuCheng Wang
  • ZhuYin Chu
  • Rong Xiao
  • Di Zhang
  • XuDong Che
Research Paper

Abstract

The polymetallic Dushiling W-Cu deposit is a large, altered, skarn-type deposit, located in the northeastern part of the Miao’ershan-Yuechengling pluton, China. Two types of granite have been identified in the deposit: a medium-grained porphyritic biotite granite, and a medium- to fine-grained biotite granite. Both are spatially and temporally related to ore bodies, suggesting they may be the source of mineralization in the deposit. A medium- to fine-grained porphyritic biotite granite is exposed at the surface in the region of mineralization. U-Pb dating of zircons yielded magmatic ages of 423 Ma for the medium-grained porphyritic biotite granite and 421 Ma for the medium- to fine-grained porphyritic biotite granite, while a younger age (217 Ma) obtained for surface samples indicates later diagenesis. Thus, magmatism occurred during the Caledonian and Indosinian, respectively. The petrological and geochemical characteristics of the two Caledonian granites show that both are calc-alkaline and peraluminous. They are moderately enriched in Cs, Rb, U, and REE, and strongly depleted in Sr,Ba,P,and Ti; they show similar REE behavior, including negative Eu anomalies. These geochemical similarities suggest that the two granites were derived from the same source, although they were emplaced during different stages of the evolution of the magma. Furthermore, the granites are associated with mineralization, suggesting they were the source of mineralization in the Dushiling W-Cu deposit. Sm-Nd ages of scheelite from the Dushiling W-Cu deposit indicate that metallogenesis occurred at 417±35 Ma, while the two types of titanite, intergrown with scheelite, yield U-Pb ages of 423–425 Ma (in altered granite sample) and 218 Ma (in skarn sample). These ages place the main mineralization event in the late Caledonian, and later magmatic-hydrothermal activity occurred in the Indosinian. The ages obtained for the Dushiling W-Cu deposit in the western Nanling Range, northern Yuechengling, together with the occurrence and ages of the Niutangjie W deposit in southern Yuechengling, provide insight into the process of ore concentration during the Caledonian and Indosinian.

Keywords

Dushiling W-Cu deposit Ore-bearing granite Multi-aged mineralization Scheelite Sm-Nd dating Titanite U-Pb dating 

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Copyright information

© Science China Press and Springer-Verlag Berlin Heidelberg 2016

Authors and Affiliations

  • WenDi Chen
    • 1
  • WenLan Zhang
    • 1
    Email author
  • RuCheng Wang
    • 1
  • ZhuYin Chu
    • 2
  • Rong Xiao
    • 3
  • Di Zhang
    • 2
  • XuDong Che
    • 1
  1. 1.State Key Laboratory for Mineral Deposits Research, School of Earth Sciences and EngineeringNanjing UniversityNanjingChina
  2. 2.Institute of Geology and GeophysicsChinese Academy of SciencesBeijingChina
  3. 3.Hunan Institute of Geological SurveyChangshaChina

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