《Table 2 LA-ICP-MS-based AFT data for sandstone samples from the southern Ordos Basin》

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《"Latest Triassic to Early Jurassic Thrusting and Exhumation in the Southern Ordos Basin, North China: Evidence from LA-ICP-MS-based Apatite Fission Track Thermochronology"》

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Note:Ns=number of spontaneous tracks counted；ρs=spontaneous track density；Dpar=long axis of track etch pit；Nlength=number of lengths measured；se=standard error.

The AFT data set including age，length，and Dpar are presented in Table 2.Radial plots of single grain age data are illustrated in Fig.4.The AFT ages range from72.0±4.8 to 183.8±9.8 Ma，and all are significantly younger than their stratigraphic ages and therefore considered to have been fully thermally reset.All samples passed theχ2 test（Galbraith，1981），showing the homogeneity of the grain age population.Spreading of individual grain ages may result from different chemical compositions of the apatite grains，although there is no clear correlation between Dpar values and AFT ages（Fig.5）.The mean Dpar values vary between 1.45μm and 1.72μm，indicating fairly similar chemical compositions with a low resistance to annealing（Ketcham et al.，1999）.The mean length of confined tracks ranges between 11.9±0.2μm and 12.5±0.4μm，with standard deviations of 0.13 to2.29μm，suggesting a slow exhumation or a prolonged residence in the APAZ.