地质通报2017，Vol.36Issue(10)：1740-1749,10.
台湾东部未变形花岗岩LA-ICP-MS锆石U-Pb定年及其地质意义
LA-ICP-MS zircon U-Pb dating of the undeformed granite in eastern Taiwan and its geological significance
摘要
Abstract
Yuantoushan is located in the north of Tailuko belt, eastern Taiwan. It is mainly composed of strongly deformed and meta-morphosed granodiorite-gabbro"slurry mixed rock"combination. Deformed intrusions are in the center and show typical magmat-ic features, representing magmatic events after deformation and metamorphism. The authors carried out field geological survey and petrologic as well as isotopic geochronologic studies of metamorphic intrusive rocks and intrusive rocks. It is shown that there are sig-nificant differences in rock characteristics and main trace elements between the two kinds of rocks, indicating that the two kinds of rocks are products of different tectonic magmatic events. Undeformed intrusive rock is quartz diorite, with high Pb, Rb, U, Th, Zr, exhibiting mild enrichment characteristics of I type granite, and its LA-ICP-MS zircon U-Pb isotopic age is 82 ± 1Ma, suggesting the Late Cretaceous Campanian period. This indicates that the deformation and metamorphism event in eastern Taiwan were ended, and the evolution then entered a non-squeezing neotectonic stage.关键词
台湾东部/块状石英闪长岩/LA-ICP-MS锆石U-Pb定年/晚白垩世坎潘期Key words
eastern Taiwan/undeformed quartz diorite/LA-ICP-MS zircon U-Pb dating/Late Cretaceous Campanian period分类
天文与地球科学引用本文复制引用
黄长煌..台湾东部未变形花岗岩LA-ICP-MS锆石U-Pb定年及其地质意义[J].地质通报,2017,36(10):1740-1749,10.基金项目
中国地质调查局项目《闽台中生代构造岩浆区区域地质专项调查》(编号:12120114043301) （编号:12120114043301）
