首页|Crust and Upper Mantle Density Structures beneath the Eastern Tianshan Region and Its Tectonic Implications
Crust and Upper Mantle Density Structures beneath the Eastern Tianshan Region and Its Tectonic Implications
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The deformation mechanisms of the Tianshan orogenic belt (TOB) are one of the most important unresolved issues in the collision of the Indian and Eurasian plates. To better understand the lithospheric deformation of the eastern Tianshan orogenic belt, we combined the S-wave tomography and gravity data to develop a three-dimensional (3D) density model of the crust and upper mantle be-neath the eastern Tianshan area. Results show that the crust of the eastern Tianshan is mainly charac-terized by positive density anomalies, revealing widespread subduction-related magmatism during the Paleozoic. We however have also observed extensive low-density anomalies beneath the eastern Tian-shan at depths deeper than ～100 km, which is likely linked to a relatively hot mantle. The most funda-mental differences of the lithosphere within the eastern Tianshan occur in the uppermost mantle. The uppermost mantle layers in the Bogda Shan and Harlik Shan are relatively dense. This is likely associ-ated with an eclogite body in the uppermost mantle. The most significant negative anomaly of the up-permost mantle is however found in the Jueluotage tectonic belt and the central Tianshan Block and is possibly associated with depleted mantle material. We suggest that these differences related to composi-tional changes may control the strength of the lithospheric mantle and have affected the uplift of the northern and southern segments of the eastern Tianshan after the Permian.
constrained inversiongravity anomalythree-dimensional lithospheric density structureeastern Tianshangeodynamicsgeophysics
Yiming Liu、Chao Chen、Qing Liang、Zhengwang Hu
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Hubei Subsurface Multi-Scale Imaging Key Laboratory, School of Geophysics and Geomatics, China University of Geosciences, Wuhan 430074, China
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