利用火山口形态和排列模式反演大同盆地第四纪应力方向OA

The Datong Basin is located at the northernmost part of the Shanxi Rift System and has experienced complex tectonic movements during the Quaternary period,accompanied by magmatic activity.The extent to which the characteristics of the tectonic stress field can elucidate the Quaternary tectonic evolution of the Datong Basin and the Shanxi Rift System remains unclear.This study aims to address this question by inverting the re-gional tectonic stress field based on the morphology and distribution of volcanic craters and exploring its geody-namic significance.Since the morphology and alignment patterns of volcanic craters can reflect the orientation of the regional stress field,this study used remote sensing image interpretation,field geological surveys,and sta-tistical analysis.Using an optimized survey model for crater alignment,it analyzed the Datong Volcanic Group to obtain detailed morphological characteristics and related geological information,which is then used to invert the Quaternary regional tectonic stress field of the Datong Basin.The results indicate that the dominant alignment of the Datong Volcanic Group trends northeastward,and when combined with focal mechanism solutions and other methods,the inverted Quaternary regional tectonic stress field confirms that the maximum horizontal principal compressive stress in the Datong Basin is oriented at 60°.This inversion approach is grounded in the structural control mechanism whereby volcanic dikes tend to align with the direction of maximum horizontal principal com-pressive stress,thus ensuring geological interpretability.By integrating remote sensing interpretation with statis-tical analysis,this technical approach demonstrated strong scientific validity and applicability in geological infer-ence,and provides a reference for studies of tectonic stress fields in other volcanic regions.