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地质学报  2008 

延边小西南岔大型富金铜矿床矿区内暗色脉岩的?锆石年代学及其地质意义

, PP. 517-527

Keywords: 暗色脉岩,锆石,CL图像,单颗粒锆石UPb年龄,小西南岔金铜矿床,延边

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Abstract:

本文对小西南岔富金铜矿床矿区内与成矿空间密切的成矿前辉绿辉长岩、成矿期闪长玢岩岩脉进行了单颗粒锆石SHRIMP、LAICPMSUPb年龄的测定。实验数据表明:辉绿辉长岩的16个锆石或单点有387.0±11.8Ma、292.0~251.1Ma(加权平均值270±14Ma,?n?=10)、129.8±2.6Ma、107.0~95.4Ma(加权平均年龄为103±13Ma,?n?=3)和46.8±2.6Ma五组谐和年龄;闪长玢岩的11个锆石、12个单点仅获一组谐和年龄,变化在108~98Ma之间(加权平均值102.1±2.2Ma)。结合CL图像特征,初步厘定成矿前辉绿辉长岩形成于早二叠世晚期(270±14Ma,?n?=10;273±14Ma,?n?=6),岩浆上侵过程中捕获了少量的泥盆世碎屑锆石,在成岩后的早白垩世、新生代始新世中期曾被热液改造;而闪长玢岩则形成于早白垩世晚期。考虑到伴生闪长玢岩的年龄与辉绿辉长岩的107.0~95.4Ma相匹配,且辉绿辉长岩的热液锆石年龄在103~95.4Ma之间,进而限定该富金铜矿床的成矿热事件应发生在108~98Ma,成矿作用发生在晚中生代地壳强烈伸展、减薄作用末期,经晚白垩世―古近世的后期抬升被剥露于现今地表,其成矿滞后于中国东北部晚中生代岩浆热液金矿床大规模成矿峰期(120Ma)约10Ma。

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