马超营断裂带金矿包体及氢氧同位素研究

RESEARCH ON INCLUSION AND HYDROGEN OXYGEN ISOTOPES OF GOLD DEPOSIT IN THE MACHAOYING FAULTED ZONE

据含矿流体包体及氢氧同位素研究结果表明，与马超营断裂带有关的金矿成矿流体，为低盐度（＜１０％ｗｔ，ＮａＣｌ）的ＣＯ２—Ｈ２Ｏ—ＮａＣｌ流体，ＣＯ２含量较低（＜１０ｍｏｌ％）。主矿化温度为１５０～２６０℃，成矿压力为７００×１０５～１０００×１０５Ｐａ。成矿流体具有多源性，既有变质水，又有岩浆水，而且主矿化阶段还有大气降水参与。

According to the researching results for the inclusion of ore forming fluid and hydrogen oxygen isotopes,the mineralizing fluid of gold related to the Machaoying faulted zone is CO 2—H 2O—NaCl fluid which has the hyposaline(<10% wt,NaCl)and lower CO 2 content(<10 mol.%) The main temperature of mineralization is 150～260℃,the ore forming pressure is 700×10 5～1000×10 5Pa The mineralizing fluid has the polygenic property having both metamorphic water and magmatic water,and the atmospheric water has also participated in the mineralization of main stage of mineralization.