Citation: | WANG Guoqiang, LI Xiangmin, YU Jiyuan, TANG Zhuo, ZHU Tao, PAN Feng, ZHANG Yue, BU Tao. LA-ICP-MS zircon U-Pb dating of syenite from Yushigou in Northern Qilian Mountain[J]. Geological Bulletin of China, 2018, 37(4): 532-537. |
The Yushigou ophiolite in Northern Qilian Mountain, which has developed relatively complete and typical ophiolite rock association, has received widespread attention. The authors conducted the chronological study of zircons from the syenite by means of LA-ICP-MS U-Pb. The weighted mean age of the zircons is 522.7±5.3Ma, which belongs to the Early Cambrian and confirms the earliest record of alkaline intrusive magmatic activity in Northern Qilian Mountain. At the same time, this age gives a constraint that the upper limit of the age of Yushigou ophiolite should be no later than 522.7Ma.
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Geological map of the North Qilian orogen with localities of major ophiolite suites and their ages
Section of the Yushigou ophiolite in Qilian County, Qinghai Province
Microphotograph of syenite inYushigou
Cathodoluminescence images of analyzed zircons from the syenite of the Yushigou ophiolite
U-Pb concordia diagrams for zircons from syenite in Yushigou ophiolite