福建顺昌三连甫地区早泥盆世花岗岩的发现及形成构造环境  

Formation of the Structural Environment and Discovery of the Early Devonian Granite in the Sanlianfu Area of Shunchang Country,Fujian Province

作　　者：陈强 Chen Qiang(Northern Fujian Geologic Party of Fujian Province, Shaowu, 354000)

机构地区：[1]福建省闽北地质大队

出　　处：《福建地质》2019年第3期155-168,共14页Geology of Fujian

基　　金：中国地质调查项目“武夷山成矿带龙泉—上杭地区地质矿产调查”(编码:HYZB-004-2016)

摘　　要：通过1∶5万大历口等3幅区域地质调查,利用LA-ICP-MS锆石U-Pb测年法,在研究区内获得三连甫岩体年龄为(401.3±4.7)Ma、吴坍岩体年龄为(395±2.5)Ma,将原划分为志留纪的吴坍花岗岩体、晚侏罗世的三连甫花岗岩体的时代重新厘定为早泥盆世。通过对花岗岩岩石地球化学特征的研究认为,其形成于加里东造山期后,为张性环境的产物反映了区域构造在早泥盆世时发生转折,加里东运动由持续的碰撞挤压向伸展拉张转变。Through 3 regional geological surveys, such as 1∶50 000 Dalikou, etc., using LA-ICP-MS zircon U-Pb dating, the age of Sanlianfu rock mass was (401.3 ± 4.7) Ma and Wutan rock mass (395±2.5) Ma in the research area. The WuTan granite body which was originally divided into Silurian period, and the Sanlianfu granite body which was originally divided into late Jurassic epoch, was redefined as the early Devonian. Based on the study of the lithogeochemical characteristics of the granites, it is concluded that it was formed after the period of Caledonian orogenic period and was the product of the tension environment. The discovery of granite reflects that the regional structure turned in the early Devonian with Gary's movement shifting from a constant collision squeeze to a stretch.

关 键 词：早泥盆世 S型花岗岩 锆石U-PB测年 构造环境 顺昌三连甫 

分 类 号：P534.44[天文地球—古生物学与地层学] P588.121[天文地球—地质学] P597.3