太行山北段赤瓦屋岩体锆石SHRIMP U-Pb年龄及其意义  

Zircon SHRIMP U-Pb Age of Chiwawu Granite Complex and Its Implication in the Northern Taihang Mountain

作　　者：刘阳[1,2] 李程明[1] 穆一青 孙赫[2] 黄费新[2] 郑杰[2] 

机构地区：[1]中国地质大学(北京)地球科学与资源学院,北京100083 [2]中国冶金地质总局矿产资源研究院,北京100025 [3]青海省第四地质矿产勘查院,西宁810029

出　　处：《地质与勘探》2010年第3期442-447,共6页Geology and Exploration

基　　金：国家自然科学基金项目(40672150)资助

摘　　要：太行山北段阜平南部赤瓦屋岩体中心相-过渡相-边缘相岩性分别为斑状花岗闪长岩-花岗闪长岩-石英闪长岩。本文选取赤瓦屋岩体边缘相中的两个样品进行了SHRIMP U-Pb年代学数据测试,所得两组年龄值约为134.0Ma、139.8Ma,与同方法所测得的麻棚岩体年龄125.0±3.4Ma相比略早。结合前人资料,赤瓦屋岩体年龄值的测试结果进一步证实了中国东部及东亚地区中生代岩浆活动存在从南东-北西方向的年轻化趋势,并为太行山中生代岩浆活动与古太平洋板块的俯冲有关提供了证据。Chiwawu complex granite in southern Fuping of northern Taihang Mountain can be divided into 3 rock units from central to the edge zone,from porphyritic,granodiorite,granodiorite to quartz diorite. This paper reported SHRIMP U-Pb data of boundary zone of Chiwawu granite complex is determined at 134.0Ma and 139.8Ma,and they are older than the age of boundary zone of Mapeng granite complex of 125.0 Ma. These results further indicate that Mesozoic magmatic events in Eastern China and Eastern Asia become yonger from SW to NE. And also,the study can provide evidence for the hypothesis that northern Taihang mesozoic magma activity is related to paleopacific ocean plate subduction.

关 键 词：赤瓦屋 太行山 SHRIMP U-PB年龄 

分 类 号：P548[天文地球—构造地质学] P597.1[天文地球—地质学]