马超营断裂带金矿床δ^(34)S特征及有关问题讨论

THE δ34SPROPERTIES OF GOLD DEPOSITS IN THE MACHAOYING FAULTED ZONE AND SOME RELATED PROBLEMS

沿马超营断裂带分布有石英脉型和构造蚀变岩型金矿床。据硫同位素研究表明：石英脉型δ３４Ｓ为小正值，成矿深度大，温度高（２００～２５０℃）；构造蚀变岩型δ３４Ｓ多为负值，成矿温度低（１５０℃左右），且大气降水的参与对成矿起重要作用。本区金在热液中主要以氢硫络合物的形式存在。

he quartz vein typeand tectonoaltered rock type gold deposits are distributed along the Machaoying faulted zone. The researching results for sulfur isotope are as follows:the δ34S in the quartz vein type gold deposit has the smallnormal value, very deep in formational depth and higher formational temperature(200～250℃);the δ34S in the tectonoaltered rock type gold deposit has mostly the negative value, low formational temperature(about 150℃),and the participation of atmospheric water has the important action for the mineralization. The gold in the hydrothermal solution in this region existed mainly as the mode of hydrogensulfur complex.