地球与行星物理论评（中英文）2024，Vol.55Issue(4)：381-398,18.DOI:10.19975/j.dqyxx.2023-034
天山造山带壳幔速度结构及深部构造过程综述
Seismic velocity structures and deep dynamic processes in the crust and mantle beneath the Tianshan Orogenic Belt
摘要
Abstract
As a typical region of intracontinental orogeny,the Tianshan Orogenic Belt has consistently attracted significant scientific interest from geologists,both in China and internationally.The distribution of velocity anomalies beneath the Tianshan Orogenic Belt is of profound importance as it sheds light on the response of orogenic areas to activation mechanisms.In this study,crust-mantle velocity anomalies were investigated in different sections of the Tianshan Orogenic Belt,as well as the formation mechanisms of these anomalies and the dynamic evolution pro-cess of uplift and deformation.Different seismic methodologies were applied,including tomographic imaging,re-ceiver function analysis,and GPS observations.The results of this systematic analysis indicate that regional velo-city anomalous structures are closely correlated with the geological tectonic features and dynamic evolutionary pro-cesses in the Tianshan Orogenic Belt and its surrounding areas.Specifically,the characteristics of the high-velocity anomalous structures beneath the Tianshan Orogenic Belt,including the tilt direction,morphology,and location of these structures,are evidence of a unique intracontinental subduction mechanism.Furthermore,the presence of low-velocity anomalous structures in different regions of the belt indicates the existence of small mantle plumes or small-scale mantle convection caused by upwelling thermal material from the asthenosphere as well as partial melting within the crust due to magma underplating.These findings have significant implications for further understanding of the dynamic processes in the Tianshan region,including intracontinental subduction,crustal shortening deforma-tion,lithospheric delamination,and the upwelling of asthenospheric materials.The results also serve as valuable reference data for further study of the seismic activity distribution in the Tianshan area.关键词
天山/壳幔速度异常/陆内俯冲/部分熔融/深部构造过程Key words
Tianshan/velocity anomalies in crust and mantle/intracontinental subduction/partial melt/deep tectonic processes分类
天文与地球科学引用本文复制引用
崔冉,崔清辉,周元泽..天山造山带壳幔速度结构及深部构造过程综述[J].地球与行星物理论评（中英文）,2024,55(4):381-398,18.基金项目
国家自然科学基金面上资助项目(42074103) （42074103）
中央级公益性科研院所基本科研业务费专项(CEAIEF20220201,CEAIEF20230204)Supported by the National Natural Science Foundation of China(Grant No.42074103),and the Central Research Institutes of Basic Research and Public Service Special Operations(Grant Nos.CEAIEF20220201,CEAIEF20230204) （CEAIEF20220201,CEAIEF20230204）
