福建沿海中-基性岩墙群锆石SHRIMP U-Pb定年  

SHRIMP U-Pb Zircon Dating of the Basic-Intermediate Dikes from the Coastland of Fujian Province

作　　者：杨永峰[1,2] 杨俊杰[3] 李南美[1,2] 闫强[4] 占玄 董传万[2] 

机构地区：[1]中化地质矿山总局浙江地质勘查院,杭州310002 [2]浙江大学地球科学系,杭州310027 [3]浙江省长兴县国土资源局,浙江长兴313100 [4]中国地质科学院矿产资源研究所,北京100037

出　　处：《地质科技情报》2010年第5期23-29,共7页Geological Science and Technology Information

基　　金：国家自然科学基金项目(40372035)

摘　　要：福建沿海地区晚中生代的花岗岩及火山岩中广泛发育基性、中基性的岩墙群,岩墙群岩性为辉绿岩、角闪辉绿岩和石英闪长岩等,并以角闪辉绿岩为主。采集晋江、同安、湄洲岛等地具有代表性的岩墙样品,选择锆石进行SHRIMPU-Pb定年,测试分析结果表明,它们的同位素年龄都比较接近,都形成于96～87Ma之间,是晚白垩世岩浆活动的产物,它们的形成是中国东南沿海晚中生代活动大陆边缘构造—岩浆活动的最后一幕。Basic-intermediate dikes are universally found in the Late Mesozoic granite and volcanic rocks of the coastland in Fujian Province.Their lithology is composed of diabase,hornblende diabase and quartz-diorite etc,predominated by diabase.The representative dike samples were collected from Jinjiang,Tong＇an and Meizhoudao for SHRIMP U-Pb zircon dating.The zircon SHRIMP U-Pb isotopic analytical results indicate that with comparatively adjacent forming ages,ranging from 96Ma to 87Ma,they should have em-placed approximately at the same time and should be the products of the magmatic activities in the Late Cretaceous,Late Mesozoic Era.This illustrates that their formation was the last stage of the Late Mesozo-ic tectonic-magmatic events of the active continental margin of the coastland in SE China.

关 键 词：福建沿海 晋江 同安 湄洲岛 岩墙群 锆石SHRIMP U-PB定年 

分 类 号：P597.3[天文地球—地球化学]