摘要
在研究古田地区印支期岩体地质特征和接触关系的基础上，为了进一步确定岩浆侵入时代，采集有代表性的不同岩石类型样品进行LA-ICP-MS锆石U—Pb测年，获得岩浆成岩年龄为232．2～235．3Ma，属中三叠世时期。综合岩体侵入接触关系、岩石学特征、锆石U-Pb年龄等资料，将前人归属华力西期、燕山早期、燕山晚期的岩体厘定为印支期花岗岩，其岩浆侵入时代与印支构造运动相一致。因此，重新客观厘定不同时期的花岗岩，对研究构造运动、晚古生代地层的改造有重要意义，对找矿方向有指示作用。
Based on the geological characteristics of Indosinian rock mass and contact relation in Gutian area, in order to determine the age of magmatic intrusion, collecting representative of different types of rock samples to LA-ICP-MS zircon U-Pb dating, the magmatic rock form- ing age was 232.2 ~ 235.3 Ma and belong to Mid-three Triassic period. Comprehensive the date of the intrusive contact relationship, petrological characteristics and U-Pb zircon age, the former belongs to the for determining rock mass is set toIndosinian granites which be- longed to the rock mass of Variscan, early Yanshan and late Yanshan, its magma intrusion age is consistent with the indosinian tectonic movement. Therefore, objectively determined in different periods of granite, is important for studing tectonic movement and the transfor- mation of thelate Paleozoic strata, and prospecting direction indicator.
出处
《福建地质》
2016年第1期16-25,共10页
Geology of Fujian
