新疆北部准噶尔-东天山地区金矿床成矿流体主要特征
The characteristics of ore-fluid of gold deposits in Jungger-East Tianshan Mountains area, Xingjiang
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摘要: 产于新疆北部准噶尔-东天山地区的金矿床,主要形成于石炭和二叠纪,与该区的碰撞造山作用发生时间、空间、地球动力学背景完全吻合,代表了新疆北部后碰撞构造-岩浆-成矿活动的产物.该区典型金矿床石英流体包裹体小,以气液包裹体为主,未见含子矿物包裹体,含CO2包裹体相对小、少,流体的盐度低,流体的温度主要是中低温.相同类型金矿床成矿流体水的来源相近,不同类型金矿床水的来源不同.矿物中S、Pb同位素及黄铁矿和矿物包裹体流体中REE主要为深源,佐证了本区成矿物质金是深源,深源的金主要以金硫络和物形式向上迁移.流体中C为地幔与地层的混源,其中直接侵入于含炭碎屑岩建造的构造蚀变脉岩型金矿成矿流体中C主要为有机碳,凸显出本区沉积地层生物成因有机碳对深源的金在浅部的搬运及卸载成矿有重要作用.
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