【摘要】 福建政和地区铜盆庵花岗岩位于政和-大埔断裂带内,与夏山矽卡岩型铅锌矿的形成关系密切,研究程度不高。本文报导了铜盆庵岩体的锆石LA-ICP-MS U-Pb年代学研究结果及其稀土元素组成,岩体中间相锆石的206Pb/238 U加权平均年龄为153.54 Ma±1.8Ma(MSDW=1.8),岩体边缘相锆石的206Pb/238 U加权平均年龄为152.97Ma±0.79Ma(MSDW=3.4),两个样品的锆石的稀土元素配分图均表现为亏损轻稀土、富集重稀土,明显的正Ce异常及负Eu异常,说明其壳源锆石特征。综合区域地质背景认为其形成于古太平洋俯冲下的活动大陆边缘环境,为挤压到伸展过渡构造背景下的产物,并提出夏山铅锌矿的成矿年代与铜盆庵岩体成岩年代相近,成岩成矿关系密切。更多还原

【Abstract】 The Tongpenan pluton in the Zhenghe area of Fujian Province is located in the Zhenghe-Dapu fault zone and closely related with Xiashan Skarn type Pb-Zn Deposit.In this paper,the zircon LA-ICP-MS U-Pb age and the rare earth element compositions of the Tongpenan pluton are presented.It shows that the weighted average 206Pb/238 U ages for zircons in the central zone of pluton are 153.54 Ma±1.8 Ma(MSDW=1.8),and the weighted average 206Pb/238 U ages for zircons in the edge zone of pluton are 152.97 Ma±0.79 Ma(MSDW=3.4).The distribution model of REE for the zircons from the two samples show relatively LREE-depleted,HREE-enriched,significant Ce positive anomalies and Eu negative anomalies.Also,These are magmatic zircon of crust origin.Based on the regional geological background,it was formed by the ancient Pacific subduction,but belongs to the stage of transformation from convergent to divergent pattern.Furthermore,it is considered that the metallogenic age of Xiashan Pb-Zn deposit is similar to the diagenetic age of Tongpenan pluton,and the Xiashan Pb-Zn deposit is closely related to the Tongpenan pluton.更多还原