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Geoscience ›› 2020, Vol. 34 ›› Issue (03): 569-578.DOI: 10.19657/j.geoscience.1000-8527.2020.013

• Ore Deposits • Previous Articles     Next Articles

Sulfur and Lead Isotopic Compositions of Meixian Zinc-lead Polymetallic Deposit, Central of Fujian Province, China and Tracing for the Source of Metals: Examples from the Dingjiashan and Fengyan Zinc-lead Polymetallic Deposits

XIAO Xiaoniu1,2,3(), FEI Lidong1,3, QIN Xinlong1, XIAO E1,3, LIU Rongfang1   

  1. 1. East China Mineral Exploration and Development Bureau for Non-ferrous, Nanjing, Jiangsu 210007, China
    2. Fujian Jindong Mining Company Limited, Sanming, Fujian 365101, China
    3. School of Earth Sciences and Engineering, Nanjing University, Nanjing, Jiangsu 210093, China
  • Received:2018-12-10 Revised:2019-12-18 Online:2020-07-04 Published:2020-07-05

Abstract:

The Meixian lead-zinc polymetallic ore field is located in the central Fujian Province, and occurs in the Mid-Late Proterozoic greenschist-facies metamorphic basement window. Workers still dispute about the ore-forming material source and metallogenic origin of the Pb-Zn deposits in the ore field. Here, we analyzed the sulfur and lead isotope compositions of the main-ore-stage sphalerite and galena from the Dingjiashan and Feng-yan lead-zinc polymetallic deposits in the ore field. Our study shows similar sulfur and lead isotope compositions in these sulfides. The ore sulfides from the Dingjiashan and Fengyan deposits have δ 34S=0.4‰-5.0‰ (average 2.66‰) and 1.8‰-4.2‰ (average 2.88‰),respectively, indicating an identical mantle-derived sulfur source. The ore sulfides from the two deposits have, respectively,206Pb/204Pb=18.326-18.496 (average 18.388) and 18.378-18.646 (average 18.447),206Pb/204Pb=15.658-15.817 (average 15.705) and 15.619-15.746 (average 15.700), and 208Pb/204Pb=38.724-39.257 (average 38.880) and 38.365-39.009 (average 38.823), indicating the same crust-mantle mixed source. The sulfur and lead isotopic characteristics of ore sulfides suggest that the ore-forming materials were mainly from the Yanshanian (porphyritic) granites. Integrating the geological characteristics of deposits and orebody, we suggest that the formation of the Dingjiashan and Fengyan lead-zinc polymetallic deposits was related to the intrusion and contact metasomatism of the Yanshanian (porphyritic) granites.

Key words: Meixian lead-zinc polymetallic ore field, sulfur isotope, lead isotope, ore-forming material source, contact metasomatism

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