南岭贵东岩体北部英安斑岩锆石LA-ICPMS U-Pb年龄及其地质意义  

LA-ICPMS U-Pb Dating of Zircons in Dacite Porphyry at North Guidong Pluton in Nanling Mountain and Its Geological Significance

作　　者：吴继光 

机构地区：[1]广东省核工业地质局293大队,广东广州510800

出　　处：《铀矿地质》2013年第5期268-273,262,共7页Uranium Geology

基　　金：中央地勘基金资助(项目编号:2009441002)

摘　　要：贵东岩体位于南岭大东山-贵东花岗岩带的东部地区,在岩体北部外围的上洞、河口及全南等地有英安斑岩出露,本文利用LA-ICPMS锆石U-Pb原位测年方法对采自上洞、河口等地的英安斑岩进行了年代测定,结果表明:英安斑岩的年龄为450.8 Ma,属加里东期岩浆作用产物。这与前人认为该岩体的形成时代为晚侏罗世(约145Ma)有显著不同。Guidong pluton is located in the east of Dadongshan Guidong granite belt in Nanling mountain range, the dacite porphyry of sub-volcanic rock occurred in the north part of Guidong pluton at Shang- dong, Hekou and Quannan. LA-ICPMS was used to determine U-Pb ages of samples from Shangdong, Hekou region and found that the age of dacite porphyry is 450.8 Ma which indicate the rocks was formed in Caledonian, not the commonly believed Late Jurrasic （about 145 Ma）.

关 键 词：贵东岩体 英安斑岩 锆石U—Pb定年 加里东期 

分 类 号：P597[天文地球—地球化学]