安徽庐枞矿集区花山岩体成岩时代及其地质意义  

Geochronology of the Huashan pluton in the Lu-Zong ore district,Anhui Province and its geological implications

作　　者：张舒[1] 张赞赞[1] 吕博[1] ZHANG Shu;ZHANG Zanzan;LYU Bo(Geological Survey of Anhui Province(Institute of Geological Sciences of Anhui Province),Hefei,Anhui 230001,China)

机构地区：[1]安徽省地质调查院(安徽省地质科学研究所),安徽合肥230001

出　　处：《安徽地质》2023年第2期97-100,123,共5页Geology of Anhui

基　　金：安徽省自然科学基金项目“A1型花岗岩中铀的活化迁移机制:来自锆石微区结构及成分的约束”(编号:2208085MD94);国家重点研发计划专题“庐枞和宁芜地区火山岩型富铁矿找矿模式和增储示范工程”(编号:2022YFC2903703-4)联合资助。

摘　　要：花山岩体位于长江中下游成矿带庐枞矿集区东南部的A型花岗岩带内。详细的岩相学工作显示,花山岩体岩性为正长花岗岩。锆石U-Pb激光定年结果显示,花山正长花岗岩的侵位年龄为(125.2±0.8)Ma,其形成于长江中下游地区早白垩世伸展的构造背景之下。综合分析前人的年代学研究成果,庐枞矿集区早白垩世岩浆活动可以划分为134~128 Ma、131~124 Ma、99~96 Ma 3个阶段,包括花山岩体在内的A型花岗岩是第二阶段岩浆活动的产物,其形成受控于早白垩世中国东部统一的伸展构造事件。The Huashan pluton is situated in the A-type granite belt on the southeastern margin of the Lu-Zong ore district and has been confirmed as syenogranite by detailed petrographic study.LA-ICP MS zircon U-Pb dating indicates that the pluton was formed at 125.2±0.8 Ma in extensional tectonic setting along the middle-lower Yangtze River metallogenic belt.Based on previous geochronological data,early Cretaceous magmatic activities in the Lu-Zong ore district can be divided into three periods,i.e.,134~128 Ma,131~124 Ma,and 99~96 Ma.The Huashan pluton-included regional A-type granites of 131~124 Ma were genetically controlled by extensional tectonic event in eastern China.

关 键 词：花山岩体 庐枞矿集区 A型花岗岩 锆石U-PB测年 伸展构造 

分 类 号：P597[天文地球—地球化学]