《Table 4 Whole-rock Sr-Nd isotopic data for the syenite and granite in the Tengchong block》
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《"Early-Cretaceous Syenites and Granites in the Northeastern Tengchong Block, SW China: Petrogenesis and Tectonic Implications"》
87Rb/86Sr and 147Sm/144Nd ratios were calculated using Rb,Sr,Sm and Nd contents analyzed by ICP-MS.T2DM represent the two-stage model age and were calculated using present-day(147Sm/144Nd)DM=0.2137,(147Sm/144Nd) DM=0.51315 and(147Sm/144Nd)crust=0.10
The zircons from dated samples were also analyzed for Lu-Hf isotopes on the same domains,and the results are listed in Table 5.Initial 176Hf/177Hf ratios andεHf(t)values of the zircons were calculated according to their LA-ICP-MS zircon U-Pb dates for the syenite.We selected 12zircon grains from the syenite(DMJ13)for Lu-Hf isotopic analysis.All of these spots display concordant zircon U-Pb dating,which have various and relative enriched Hf isotopic compositions withεHf(t)values ranging from-9.11 to-0.27(but one is+5.30),with corresponding twostage Hf model ages of 1.18 to 1.75Ga(but one is 0.83Ga).Above these various Hf compositions possibly indicate the more ancient continental crust(Yang et al.,2007;Zheng et al.,2007).
图表编号 | XD0017174900 严禁用于非法目的 |
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绘制时间 | 2018.08.01 |
作者 | ZHU Renzhi、LAI Shaocong、QIN Jiangfeng、ZHAO Shaowei |
绘制单位 | State Key Laboratory of Continental Dynamics, Department of Geology,Northwest University、State Key Laboratory of Continental Dynamics, Department of Geology,Northwest University、State Key Laboratory of Continental Dynamics, Department of Geology,Northwest |
更多格式 | 高清、无水印(增值服务) |
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