南京大学学报(自然科学版) ›› 2018, Vol. 54 ›› Issue (2): 386.
李 利1,倪 培1*,王国光1,朱安冬1,范明森1,黄卫平2
Li Li1,Ni Pei1*,Wang Guoguang1,Zhu Andong1,Fan Mingsen1,Huang Weiping2
摘要: 德兴矿集区是我国重要的Cu-Au-Mo-Pb-Zn-Ag矿产资源产地,张家畈金矿远景区位于德兴斑岩铜矿田的北西部. 选取张家畈成矿远景区深部的矿化花岗闪长斑岩作为研究对象,对其进行了系统的LA-ICP-MS锆石U-Pb年代学和锆石Lu-Hf同位素分析. 张家畈花岗闪长斑岩两件样品中锆石14个分析点206Pb/238U的加权平均年龄为171±1 Ma(MSWD=0.54). 张家畈花岗闪长斑岩锆石Lu-Hf同位素结果为:εHf(t)为+5.2~+6.3,两阶段模式年龄为813 Ma~883 Ma. 该岩体的原始岩浆来源于新元古代下地壳物质的部分熔融,并在形成过程中可能加入了地幔组分. 中侏罗世,伊泽纳崎板块向华南板块北西向俯冲,在华南内陆产生了一系列伸展型岩浆作用,指示了局部拉伸的环境,因此,张家畈花岗闪长斑岩形成于陆内拉伸的构造背景. 张家畈矿化花岗闪长斑岩的成岩时代及Hf同位素特征均与德兴斑岩铜矿田的成矿花岗闪长斑岩相似,且张家畈成矿远景区内自然金与黄铜矿伴生,因此,其深部可能具有斑岩型矿化.
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