Sphalerite and Pyrite Geochemistry from the Pusangguo Co-Rich Cu–Zn–Pb Skarn Deposit, Tibet: Implications for Element Occurrence and Mineralization
نویسندگان
چکیده
The Pusangguo deposit (1.42 Mt @ 1.42% Cu, 0.14 1.82% Zn, 0.08 1.01% Pb, and 285.8 t Co 140 g/t Co) is the first Co-rich Cu-Zn-Pb skarn discovered in Gangdese metallogenic belt. However, trace minor element geochemistry of sulfides this has not been studied, limiting further understanding elements’ occurrence mineralization. Here, we identified four ore stages, two types sphalerites (SpI SpII) pyrites (PyI PyII), deposit. In study, LA-ICP-MS in-situ analyses were conducted on sphalerite pyrite, to obtain their chemical compositions, elemental substitution mechanisms, mineralization physicochemical conditions. results indicate that are generally more enriched with than pyrite. SpI higher concentrations Co, Cr, Ag, As compared SpII. Both have very low contents Sn, Ge, Ga. PyII most elements, such as Ni, Mn, As, Se, Bi, PyI. pyrite poor Ga, Cd, but Ni. Fe, Cd sphalerite, Mn lattice-bound, while Sb usually present both micro-inclusions coupled substitution. Significant correlations possible mechanisms 2Fe2+ + Ga2+ ↔ 3Zn2+, Ge4+ 4Zn2+, (Sb3+, Sn3+) (Cu+, Ag+) 2Zn2+. correlation trends between elements suggest (Tl+ Cu+ (As3+ Sb3+) 2Zn2+ As3+ temperature at Pusangguo, determined by GGIMFis geothermometer, 237–345 °C (avg. 307 °C), consistent high Zn/Cd ratio 203), Ga/In 0.06), In/Ge 15.9) Co/Ni 24) These ore-forming fluid was high-temperature, a sulfur fugacity (fS2) (10−13.4 10−8.3) oxygen (fO2). temperature, fluid, fluid-mixing process, jointly controlled sulfide precipitation, which caused formation
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ژورنال
عنوان ژورنال: Minerals
سال: 2023
ISSN: ['2075-163X']
DOI: https://doi.org/10.3390/min13091165