吉林大学学报(地球科学版) ›› 2020, Vol. 50 ›› Issue (5): 1404-1417.doi: 10.13278/j.cnki.jjuese.20200026
• 整装勘查区矿床成因与成矿作用研究专辑 • 上一篇 下一篇
范媛媛1, 刘云华1, 于晓飞2, 赵强3, 李小严1, 邓楠1, 马塬皓1
Fan Yuanyuan1, Liu Yunhua1, Yu Xiaofei2, Zhao Qiang3, Li Xiaoyan1, Deng Nan1, Ma Yuanhao1
摘要: 甘肃武都金坑子金矿床位于碧口地块北缘西秦岭南成矿亚带。本文为探讨金坑子金矿床成因,对矿床野外地质特征,H、O、S同位素组成及流体包裹体特征进行了系统的研究。研究结果表明:矿体产于千枚岩与灰岩岩性不整合面及其附近的断裂破碎带中,主要受断裂构造控制;不同成矿阶段石英的δDH2O-VSMOW值范围为-81.4‰~-67.5‰,δ18OH2O-VSMOW值范围为7.51‰~10.55‰,显示成矿流体早期主要来源于深源岩浆水,晚期有大气降水的加入;黄铁矿δ34S值变化范围为-0.7‰~0.6‰,显示成矿物质主要来源于深部岩浆,并有地层物质加入;流体包裹体的均一温度为155.6~304.0℃,盐度(w(NaCl))为0.53%~13.29%,显示成矿流体具中温、中低盐度和富含CO2的特点。结合区域研究资料,认为金坑子金矿床成因类型为印支晚期的中温热液脉型金矿床。
中图分类号:
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