《Table 1 Sample information for low temperature thermochronology in 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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In general，the timing of tectonic contraction and associated hanging-wall exhumation is synchronous with the onset of rapid cooling.Therefore，reasonable sampling for low-temperature thermochronology study could provide the tightest constraint on timing of tectonic contraction and thrust fault activity.In this study，9sandstone samples（Table 1；Fig.3），3 kg each，were collected from both hanging-wall and foot-wall of the LSF in the southern Ordos Basin.Enough apatite grains for AFT analysis were successfully separated from 4 of 9samples，using standard heavy liquid and magnetic separation techniques.Three of them were collected at the Kouzhen section，including two hanging-wall samples and one foot-wall sample；while another foot-wall sample is located 100 km apart from Kouzhen section，albeit seemed slightly distant，deformation structure between them can be ruled out due to the lack of transverse structure in the southern Ordos Basin（Zhou Dingwu et al.，2002；Qi Kai et al.，2017）.According to apatite yields and quality，apatite fission track analysis was conducted on four samples by LA-ICP-MS method at University of Melbourne，following analytical details based on Gleadow et al.（2015）.Experimental procedures for this method are described briefly below.