黄金科学技术 ›› 2024, Vol. 32 ›› Issue (2): 191-206.doi: 10.11872/j.issn.1005-2518.2024.02.140
苏力1(),朱海军1,谷守江1(),杨兴科2(),赵翌辰2,孙雪平1,何虎军2,韩珂2,张玉瑜1,谭江1,谢愿龙1,张龙1,高立博1
Li SU1(),Haijun ZHU1,Shoujiang GU1(),Xingke YANG2(),Yichen ZHAO2,Xueping SUN1,Hujun HE2,Ke HAN2,Yuyu ZHANG1,Jiang TAN1,Yuanlong XIE1,Long ZHANG1,Libo GAO1
摘要:
宁夏海原西华山金矿区位于秦岭—祁连—昆仑造山带之祁连构造成矿带,在该矿区已发现马场和柳沟2个金矿床。区内含矿地层为长城系海原群变质地层,矿脉受断裂带控制,矿石类型主要为蚀变煌斑岩型、石英脉型和蚀变岩型。为了查明西华山金矿区矿床成因类型和成矿过程,对马场和柳沟2个金矿床开展了野外地质调查、流体包裹体显微测温和H-O-S同位素地球化学研究工作。研究表明:马场和柳沟金矿床石英流体包裹体均一温度范围分别为140.1~382.6 ℃和203.2~353.9 ℃,集中在250~260 ℃和270~280 ℃;盐度[w(NaCleq)]分别为2.57%~10.72%和5.28%~12.08%,集中在6%~7%和7%~8%;成矿期成矿流体δD值分别为-86.5‰~-87.2‰和-90.2‰~-91.6‰,δ18O值分别为7.4‰~8.7‰和8.7‰~10.0‰;2个矿区矿石黄铁矿中δ34S分布范围为-1.00‰~0.27‰。综合研究认为,区内金矿成矿流体属于中低温、中低盐度的流体,主要来源于岩浆水;硫也主要源于岩浆,有少量可能源于围岩地层;区内金矿床属于与晚古生代中酸性岩浆活动有关的中低温低盐度岩浆热液型金矿。
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