摘要
福建省紫金山铜金矿是世界上罕见的浅成低温热液-斑岩型以铜金为主的矿床,具有上金下铜的空间分带特征,紫金山复式花岗岩是上部金矿最重要的容矿岩系之一,然而目前对紫金山复式花岗岩的时代研究较为薄弱。为了准确厘定紫金山复式花岗岩不同岩体的侵位时代,笔者对紫金山复式花岗岩3个不同岩体进行了系统的锆石LA-ICP-MSU-Pb测年,获得早期迳美岩体的206Pb/238U加权平均年龄为(157.9±1.2)Ma(n=13,MSWD=0.92)、中期五龙寺岩体的206Pb/238U加权平均年龄为(149.3±1.6)Ma(n=13,MSWD=1.2)、晚期金龙桥岩体的206Pb/238U加权平均年龄为(146.3±1.6)Ma(n=8,MSWD=0.39),表明紫金山复式花岗岩侵位于晚侏罗世,为紫金山铜金矿田容矿岩系的时代研究提供了重要的新资料。
Zijinshan copper-gold deposit is rare epithermal hydrothermal-porphyry copper-gold deposit in the world. The upper of deposit is gold and the lower copper in spatial zonation. Zijinshan Complex massif is one of the most important host rocks of the upper gold deposit. However, the report about the era of Zijinshan Complex massif is poor at present. In order to determine their ages of Zijinshan Complex massif accurately, the three groups of LA-ICP-MS U-Pb dating of situ zircon from Zijinshan Complex massif are tested. Results show that 226Pb/238U weighted average ages of the first Jingmei pluton is （ 157.9± 1.2） Ma （ n = 13, MSWD = 0.92）, the second Wu- longzi pluton is （ 149.3±1.6） Ma （ n = 13, MSWD = 1.2 ）, and the latest Jinlongqiao pluton is （ 146.3±1.6 ） Ma（ n = 8, MSWD = 0.39 ）. Zijinshan Complex massif intrusived in late Jurassic, and provide an important new material for epoch of host rock.
出处
《东华理工大学学报（自然科学版）》
CAS
2012年第4期343-351,共9页
Journal of East China University of Technology(Natural Science)
基金
福建省自然科学基金"福建省不同构造单元的剥露幅度及其成因机制研究"(2010J01256)
福州大学人才基金"上杭县紫金山金铜矿区构造隆升与岩石剥蚀历史研究"(XRC-0846)
