骑田岭芙蓉锡矿的成岩和成矿物质来源：锆石Lu-Hf 同位素和矿物包裹体He-Ar同位素证据  

Diagenetic and Metallogenic Sources of Furong Tin Deposit,Qitianling:Constraints from Lu-Hf for Zircon and He-Ar Isotope for Fluid Inclusions

作　　者：单强[1] 曾乔松[1] 李建康[2] 卢焕章[3] 侯茂洲 于学元[1] 吴传军[1,4] 

机构地区：[1]中国科学院广州地球化学研究所,中国科学院矿物学与成矿学重点实验室,广州510640 [2]中国地质科学院矿产资源研究所,北京100037 [3]加拿大魁北克大学,Chicoutimi,P.Q.G7H7B1,Canada [4]中国科学院大学,北京100049

出　　处：《地质学报》2014年第4期704-715,共12页Acta Geologica Sinica

基　　金：国家“深部探测技术与实验研究专项(SinoProbe)”第三项目“深部矿产资源立体探测技术及实验研究”第一课题(编号SinoProbe-03-01)资助的成果

摘　　要：本文分析测试了骑田岭花岗岩芙蓉锡矿的各类花岗岩的锆石 U-Pb 同位素年龄和Lu-Hf同位素组成。本区有两期花岗岩，早期角闪石黑云母花岗岩锆石U-Pb谐和年龄为160．0±2．7 Ma，晚期黑云母花岗岩的锆石U-Pb谐和年龄为156．5±1．8 Ma。在晚期矿化的黑云母花岗岩中出现了蜕晶化锆石，蜕晶化锆石强烈富集LREE和U、Th，是典型热液锆石的特征。四个花岗岩锆石的Lu-Hf同位素组成说明骑田岭花岗岩的成岩物质主要来源于下地壳，它们的原始岩浆源于中元古代（1．3～1．5 Ga）下地壳物质的部分熔融，并有部分地幔物质的参与。还分析测定了骑田岭芙蓉锡矿黄铁矿、石榴子石流体包裹体的 He-Ar 同位素组成，其3 He/4 He 比值较低（0．059～0．432），介于地壳和地幔流体3 He/4 He 比值之间，表明芙蓉锡矿的成矿流体主要来源于地壳，同时有部分地幔流体的参与成矿。Determination of zircon U-Pb isotopic date and Lu-Hf isotopic composition of various granitoids in the Qitianling plutons,south China show,there are two-staged granites：the earlier hornblende granitite with 160.0 ±2.7 Ma of zircon U-Pb concordant age and the later granitite with 156.5±1.8 Ma of zircon U-Pb concordant age.Metamietimation of zircons appear in the later mineralizing granitite,those zircon is intensively riched in LREE,U and Th,and characteristics of hydrothermal zircon.Lu-Hf isotopic compositions of zircons from four granites show that diagenetic substance are derived from the lower crust, which original magmas were resulted from partial melting of the lower crust in the palaeo-Proterzoic（1 .3～1 .5 Ga）,with some mantle substance adding.He-Ar isotopic compositions for fluid inclusions of pyrite and garnet from the Qitianling Furong tin deposit also show a lower ratio of 3 He/4 He（0.059～0.432）, which ranges from those between the crust and mantle, suggests mantle fluids are involved in mineralization for the deposit （less than 10% for the amount）.

关 键 词：骑田岭花岗岩 锆石Lu-Hf同位素 包裹体He-Ar同位素 地幔流体 

分 类 号：P618.44[天文地球—矿床学] P597[天文地球—地质学]