Definition of a Meso-Cenozoic tectonic uplift event and its geological significance in the Hoxtolgay Basin,northern Xinjiang:Evidence from low-temperature thermochronology
The structural attributes of the West Junggar Orogenic Belt in northern Xinjiang have been a subject of long-standing controversy.Determining the tectonic events and uplift processes in the Mesozoic-Cenozoic in this region is crucial for studying the intracontinental deformation.This article presents a systematic analysis of the tectonic uplift events in the intermontane basins within the orogenic belt,particularly focusing on the Hoxtolgay Basin.Based on field geological surveys and fault analysis,five regional unconformities(C/J,J/AnJ,J/E,K/E and E/N)have been identified as direct evidence of tectonic activity.In the Mesozoic-Cenozoic,the basin was subjected to N-S compression stress due to two controlling faults to the north and south.The apatite fission track ages of sandstone samples indicate three distinct cooling and uplift events in the Late Jurassic to Early Cretaceous(149～125 Ma),Mid-Cretaceous(121～109 Ma),and early Late Cretaceous(80.0～77.7 Ma),reflecting a strong geological response to these three periods of cooling uplift events.Thermal history simulations suggest rapid uplift events during the Late Jurassic to Early Cretaceous(160～110 Ma),Late Cretaceous(85～65 Ma),and Oligocene to Miocene(30～5 Ma).The main stress causing the basin's tectonic uplift is the uplift of peripheral mountain ranges and the compression from fault activity.The comprehensive study indicates that the Mesozoic-Cenozoic period experienced three distinct tectonic uplift events,which are well-coupled with the far-field effects of the Indosinian,Yanshan and Xishan movements during the Mesozoic-Cenozoic.
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