中条山铜矿床同位素地球化学研究

Isotope Geochemistry of Copper Deposits in the Zhongtiao Mountain

笔者对中条山绛县群和中条群主要铜矿床进行铅、硫、碳、氢、氧同位素测定，获得：横岭关型矿床的^206Pb／^204Pb比值为17．746-19．270，^207Pb／^204Pb比值为15．500-15．684,^208Pb／^204Pb比值为37．236-39．931，硫化物的δ^34S值为-8．1‰～＋36．9‰，δ^18OH2O值为＋1．7‰～＋5．7‰，δD值为-58．4‰～-111．3‰；铜矿峪型矿床的^206Pb/^204Pb比值为18．040～46．243，^207Pb／^204Pb比值为15．565-18．765，^208Pb／^204Pb比值为37．682～69．623，硫化物的δ^34S值为-7．2‰～＋10．2‰，δ^18OH2O值为＋6．3‰-＋10．5‰，δD值为-52．8‰～-123．3‰；落家河型矿床的^206Pb／^204Pb比值为17．591～19．270,^207Pb／^204Pb比值为15．494-15．684,^208Pb／^204Pb比值为37．263-39．931，硫化物的δ^34S值为-1‰～21．99‰，δ^18OH2O值为＋3．6‰-＋6．4‰，δD值为-35．8‰--70‰；胡-蓖型矿床^206Pb／^204Pb比值为18．097-249．50，^207Pb／^204Pb比值为15．578-44．230，^208Pb／^204Pb比值为35．379-51．480，硫化物的δ^34S值为3．49‰-23．29‰，δ^18OH2O值为＋7．5‰-＋12．59‰，δD值为-36．3‰～-72．2‰。

Lead, sulfur, carbon, hydrogen and oxygen isotope determination was carried out for copper deposits in the Zhongtiao Mountain, which yielded various kinds of data. In the Henglinguan type ore d eposits, ^206Pb/^204Pb ratios are 17. 746- 19. 270, ^207Pb/^204Pb ratios are 15. 500- 15. 684,^208Pb/^204Pb ratios are 37. 236 - 39. 931, δ^34S values of sulfides are - 8.1‰ - ＋ 36.9‰, δ^13C values of carbonate rock are - 7.1‰- ＋ 2.6‰, δ^18O values of water are ＋ 1.7‰ - ＋ 5.7‰, and δD values are - 58.4‰ - -111.3‰. In the Tongkuangyu type ore deposits, ^206Pb/^204Pb ratios are 18. 040- 46. 243,^207Pb/^204Pb ratios are 15. 565- 18. 765,^208Pb/^24Pb ratios are 37. 682-69. 623, δ^34S values of sulfides are -7.2‰- ＋ 10.2‰, δ^13C values of carbonate rock are -6.7‰- ＋ 0.6‰,δ^18O values of water are ＋6.3‰- ＋ 10.5‰,and 3D values are -52.8‰- - 123.3‰. In the Luojiahe type ore deposits, ^206Pb/^204Pb ratios are 17. 591 - 19. 270,^207Pb/^204Pb ratios are 15. 494 - 15. 684,^208Pb/^204Pb ratios are 37. 263 - 39.931, δ^34S Values of sulfides are - 1‰- ＋ 21.9‰, δ^13C values of graphite are -35‰- -25‰, δ^18O values of water are ＋ 3.6‰- ＋ 6.4‰ ,and δD values are - 35.8‰- - 70‰. In the Hubi type ore deposits, ^206Pb/^204Pb ratios are 18. 097-249.50, ^207Pb/^204Pb ratios are 15. 578-44. 230,^208Pb/^204Pb ratios are 35. 379-51. 480, δ^34S values of sulfides are 3.4‰-23.2‰, δ^18O values of water are ＋ 7.5‰ - ＋ 12.5‰, and δD values are - 36.3‰ - - 72.2‰. All these data indicate that the Tongkuangyu type ore deposits were formed by magmatism, whereas the Henlinguan type, Luojiahe type and Hubi type ore deposits were formed by metamorphism.