吉林大学学报(地球科学版) ›› 2017, Vol. 47 ›› Issue (6): 1717-1731.doi: 10.13278/j.cnki.jjuese.201706111
和成忠1,2, 张德会1, 吴鸣谦1, 夏岩3, 张荣臻1,4, 胡铁军5
He Chengzhong1,2, Zhang Dehui1, Wu Mingqian1, Xia Yan3, Zhang Rongzhen1,4, Hu Tiejun5
摘要: 姚家沟钼矿是辽宁青城子矿田中近年来发现的钼矿床,位于华北克拉通北缘,燕辽钼成矿带内。姚家沟花岗斑岩岩体中发现的脑状石英细脉(UST)和石英眼是岩浆出溶热液的直接证据。该矿床蚀变分带特征明显,辉钼矿化主要发育在钾化带及矽卡岩化带中。对姚家沟岩体和钾化钼矿带的5期流体活动进行流体包裹体显微观测表明,其流体包裹体类型丰富,包括单相水包裹体(PW)、两相水包裹体(W)、三相CO2包裹体(C)、纯CO2包裹体(PC)和含子矿物包裹体(S),S型流体包裹体中子矿物有赤铁矿、黄铜矿和其他未知矿物,但没有石盐子晶。该矿床流体演化为:1)早期石英眼(均一温度为211.4~515.4℃,盐度(w(NaCl))为0.8%~19.2%)的高中温中低盐度富CO2体系;2)成矿期石英脉(均一温度为179.5~424.5℃,盐度为2.4%~21.5%)的高中温中低盐度NaCl-H2O-CO2体系;3)后期石英脉(均一温度为167.8~353.3℃,盐度为3.4%~15.8%)的中低温中低盐度NaCl-H2O-CO2体系;4)晚期方解石脉(均一温度为132.5~234.1℃,盐度为0.9%~11.2%)的中低温中低盐度NaCl-H2O体系;5) UST (均一温度为158.6~381.7℃,盐度为1.6%~21.5%)为中低温中低盐度NaCl-H2O-CO2体系,该期可能与钼矿化关系不大,代表另一期侵位更浅的岩浆出溶热液。流体不混溶、围岩蚀变以及流体混合作用导致流体温度、压力降低,CO2逸失,体系还原性增强,是成矿金属元素沉淀的主要机理。用等容线相交法对成矿期捕获压力进行估算,为124~180 MPa,对应深度为4.6~7.0 km,与同成矿带其他钼矿比较,相对较深。
中图分类号:
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