高校地质学报2025，Vol.31Issue(6)：720-732,13.DOI:10.16108/j.issn1006-7493.2024095
超长距离逆冲推覆体形成机制的物理模拟:以塔西南喀拉喀什河剖面为例
Analogue Modeling of the Formation Mechanism of Ultra-Long Distance Overthrust:A Case Study of the Karakash River Profile in Southwestern Tarim Basin
摘要
Abstract
The maximum length of overthrusts has long remained an unresolved enigma in structural geology.Theoretical calculations typically limit their lengths to approximately 16 kilometers,yet geological observations,particularly in foreland basins,often reveal overthrusts extending far beyond this limit,reaching hundreds of kilometers.For instance,overthrust in the Southwestern Tarim Basin spans 230 kilometers,significantly exceeding theoretical predictions.This study employs analogue modeling based on the geological prototype derived from structural interpretation of the Hetian-Mazhatage seismic reflection profile.Four experimental setups are designed to investigate the formation mechanisms of ultra-long-distance overthrusts by simulating syn-tectonic growth strata(via adjustments to brittle cover thickness)and modulating the shear yield strength of the ductile décollements(through variations in silicone viscosity).Experimental results demonstrate that the low-viscosity décollements significantly enhance the forward propagation of deformation in the foreland direction,increasing both the velocity and distance of strain transfer.Conversely,high-viscosity décollements impede such propagation.Additionally,the inclusion of syn-tectonic growth strata in the models amplifies decoupling effects,accelerating and extending strain transfer toward the foreland,thereby facilitating the development of long-distance overthrusts.The experiments reveal that the synergistic interaction between low-viscosity décollements and syn-tectonic growth strata constitutes a critical precondition for the formation of ultra-long-distance overthrusts in the Southwestern Tarim Basin.These findings provide novel insights into the mechanisms governing the development of ultra-long-distance overthrusts in natural settings.关键词
塔西南前陆盆地/物理模拟/逆冲推覆体/滑脱层/同构造生长地层Key words
Southwest Tarim Foreland Basin/analogue modeling/overthrust/décollements/syn-tectonic growth strata分类
天文与地球科学引用本文复制引用
艾孜买提·米尔亥力木,贾东,钟城,杨双,毛宇琼..超长距离逆冲推覆体形成机制的物理模拟:以塔西南喀拉喀什河剖面为例[J].高校地质学报,2025,31(6):720-732,13.基金项目
国家自然科学基金项目(41927802 （）
U22B6002)联合资助 （）
