湖南香花岭锡多金属矿床同位素地球化学研究

Isotope Geochemistry of the Xianghualing Tin-Polymetallic Deposit in Hunan Province

笔者对湖南香花岭锡多金属矿床成矿期不同的矿物组合进行矿物包裹体温度和硫、铅同位素测定,获得了锡石—硫化物阶段平均一温度为350℃,硫化物阶段平均均一温度为250℃。锡石—硫化物中黄铁矿的δ34S为-1.0‰～+5.4‰;闪锌矿的δ34S为+0.8‰～+5.8‰;磁黄铁矿的δ34S为+1.5‰～5.2‰;方铅矿的δ34S为-1.0‰～+3.6‰,具有变化范围小,组成稳定的特点。方铅矿的206Pb/204Pb值为17.785～19.341,207Pb/204Pb值为15.416～16.452,208Pb/204Pb值为38.357～42.579。硫同位素指示硫来源于岩浆,铅同位素指示是多来源。

According to the temperatures of inclusions in minerals and S and Pb isotopic determinations of the minerals formed at different ore-forming stages in the Xianghualing tin-polymetallic deposit, it is revealed that the homogeneous temperature of the cassiterite-sulfide phase is 350℃, the average homogenization temperature of the sulfide-stage is 250℃, the δ^34S value of pyrite in sulfide is - 1.0 ‰-＋ 5.4‰, the δ^34S S value of sphalerite is ＋ O. 8‰ - ＋ 5.8‰, the δ^34Svalue of pyrrhotite is ＋ 1. 5 ‰- 5.2‰, and the δ^34S value of galena is - 1.0‰ - ＋ 3.6‰, characterized by insignificant varia- tion and stable composition. The 206pb/204pb ratio of galena is 17. 785 ～ 19. 341, the 207pb/204pb ratio is 15. 416 - 16. 452, and the 208pb/204pb ratio is 38. 357 42. 579. The S isotopes indicate that they were derived from the magma, and the Pb isotopes suggest that they came from mixed sources.