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Genesis of the Dingjiashan Pb-Zn-Ag deposit, central Fujian region, SE China: Constraints from geological, mineralogical, geochronological and sulfur isotope data
Ore Geology Reviews ( IF 3.3 ) Pub Date : 2021-09-03 , DOI: 10.1016/j.oregeorev.2021.104446
Bo Xing 1, 2 , Jingwen Mao 1, 2 , Xiaoniu Xiao 3, 4 , Huan Liu 2 , Fudong Jia 2 , Shoushuai Wang 1 , Sheng Guo 1 , Wuyan Huang 3, 4 , Hongyu Li 3, 4 , Franco Pirajno 5
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The Dingjiashan Pb-Zn-Ag deposit is predominantly hosted in the Proterozoic marble and partly in the Jurassic tuff and quartz sandstone in the central Fujian region of southeastern China. Four mineralization stages have been identified: (Ⅰ) prograde skarn (garnet + pyroxene + rhodonite), (Ⅱ) retrograde skarn (epidote + actinolite + tremolite + biotite + chlorite + ilvaite + magnetite + hematite), (III) sulfide assemblage (sphalerite + galena + pyrrhotite + pyrite + chalcopyrite), and (Ⅳ) quartz-calcite assemblage. In this contribution, LA-ICP-MS U-Pb analysis of hydrothermal titanite coexisting with quartz, epidote, biotite, magnetite, and sphalerite in the mineralized sample reveals 207Pb-corrected weighted mean 206Pb/238U age of 144 ± 2 Ma (n = 37, MSWD = 0.86, f206 < 0.85). In situ sulfur isotope analysis of ore sulfides show a narrow variation of δ34S (-0.7 to + 5.5‰), which is consistent with a magmatic source. The geological, mineralogical, geochronological and in situ sulfur isotopic data collectively imply that the Dingjiashan is a distal stratabound Pb-Zn-Ag skarn deposit. This finding can aid understanding the genesis of other similar polymetallic deposits in the central Fujian region. Our data demonstrates that hydrothermal titanite is a reliable geochronometer for Pb-Zn-Ag skarn deposits and can aid in future prospecting and exploration for concealed porphyry Mo or Cu - Mo deposits that may be present below many of the Pb-Zn-(Ag) deposits in southeastern China.

更新日期:2021-09-09
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