Abstract The distal effect of continuous collision and subduction of the Indian plate onto the Eurasian continent during the Cenozoic reached the entire Tianshan region, strongly modifying the lithospheric structure of the Tianshan and adjacent blocks. To better understand the lithosphere evolution and deformation process in the Tianshan area, we first use a combined inversion method of gravity and seismic data to obtain the lithospheric density anomalies in the study area, and then calculate the isostatic residual topography considering the lateral variation of effective elastic thickness. The results show that the amplitude of isostatic residual topography ranges from -1.6 to 0.9 km and corresponds well with each tectonic unit. The isostatic residual topography of different parts of the Tianshan is characterized by different features, with higher negative values in the central part, indicating a strongly thickened lower crust, and with lower negative values in the west part, possibly related to asthenosphere upwelling, and with low positive values in the east part, suggesting that lithospheric deformation is dominated by surface uplift.
KONG Fanliang,ZHANG Xingyu,LIANG Qing et al. Characteristics of Isostatic Residual Topography in the Tianshan Area and Their Geological Significance[J]. jgg, 2024, 44(3): 267-271.
KONG Fanliang,ZHANG Xingyu,LIANG Qing et al. Characteristics of Isostatic Residual Topography in the Tianshan Area and Their Geological Significance[J]. jgg, 2024, 44(3): 267-271.