《Table 1 Zircon LA-ICPMS U–Pb data of Kashikashi and Kayedi plutons, and the gabbro dikes in the wes

《Table 1 Zircon LA-ICPMS U–Pb data of Kashikashi and Kayedi plutons, and the gabbro dikes in the wes   提示：宽带有限、当前游客访问压缩模式
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《"Ordovician Granitoids and Silurian Mafic Dikes in the Western Kunlun Orogen, Northwest China:Implications for Evolution of the Proto-Tethys"》


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LA-ICPMS zircon U-Pb ages have been determined for the studied granitic plutons and their gabbro dikes.The results are summarized in Table1 and illustrated in Fig.5The length of the zircons is mostly between 100 and 200μm.All zircons show regular oscillatory magmatic zoning and have variable U，Th and Th/U ratios（0.18–1.07）（Table 1） .The Th/U ratios are higher than those of metamorphic zircon，which generally show lower Th/U ratios（<0.1），and are consistent with those of magmatic zircon（Williams et al.，1996）.Most U-Pb analyses of each sample plot in a group on the Concordia curve and yield a weighted mean 206Pb/238U age of 466±2 to 436±2 Ma（Fig5）.These ages are the best estimation of magma crystallization.

图表编号XD0030679500    严禁用于非法目的
绘制时间2019.02.01
作者ZHANG Qichao、WU Zhenhan、LI Shan、LI Kan、LIU Zhiwei、ZHOU Qing
绘制单位Chinese Academy of Geological Sciences、Chinese Academy of Geological Sciences、Key Laboratory of Deep-Earth Dynamics, Ministry of Natural Resources, Institute of Geology, Chinese Academy of Geological Sciences、Xi'an Institute of Geology and Mineral Resour
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