地质通报2017，Vol.36Issue(10)：1722-1739,18.
台湾玉里带变质岩LA-ICP-MS锆石U-Pb年龄及其地质意义
U-Pb isotopic ages of zircon from Yuli Belt in Taiwan and its geological significance
摘要
Abstract
Located in the east of Taiwan, the Yuli belt is composed of volcano-sedimentary rocks and metamorphic rocks character-ized by high pressure and low temperature. The volcanic rocks belong to the calc alkaline series, with low Ba, Nb, Sr and high Pb;the total rare earth is generally low, with the patterns of less enrichment of light rare earth Eu and complete preservation of rare earth elements. LA-ICP-MS zircon U-Pb ages indicate that the apparent 206Pb/238U ages have 6 peaks: 23.3Ma (Paleogene), the upper rock age; 96.7Ma (Late Cretaceous), 124.2Ma and 130.5Ma (Early Cretaceous), 214.1~228Ma (Late Triassic), 283.7Ma and 289Ma (Early Permian). Zircons with the sub-angular or sub-rounded shape represent the magmatic zircon and indicate magmatic source rock age. Zircons with apparent 207Pb/206Pb ages of 2 peaks 1769~1852Ma (Paleoproterozoic), 2506Ma and 2530Ma (Neoarchaean) are rounded or clastic metamorphic magmatic zircons, which represent Palaeoproterozoic ages of metamorphic basement. The meta-morphic rocks in the Yuli belt might have been formed after 23.3Ma, with the expansion of the South China Sea, at the same time as the expansion of the South China Sea during the formation of the Eurasian continental block edge rift tectonics.关键词
台湾玉里带/火山-沉积岩/LA-ICP-MS锆石U-Pb定年/古近纪Key words
Yuli belt in Taiwan/volcanic sedimentary rock/LA-ICP-MS zircon U-Pb dating/Paleogene分类
天文与地球科学引用本文复制引用
黄长煌..台湾玉里带变质岩LA-ICP-MS锆石U-Pb年龄及其地质意义[J].地质通报,2017,36(10):1722-1739,18.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）
