Kinematic variability of late Cenozoic fault systems and contrasting mountain building processes in the Alxa block, western China

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چکیده

Abstract In this study, new structural field data and geological observations are coupled with remote sensing analysis compilation of previous published work to establish a kinematic framework for the neotectonic reactivation Alxa block, China. The block occupies key position in Central Asia north east contractional sinistrally transpressive deforming zones Qilianshan-Hexi Corridor-easternmost Altyn Tagh Fault Beishan belts, south southernmost Gobi Altai, west – or overlapping - Ordos extensional transtensional graben systems. addition, is internally transected by important fault systems (Bayan Nuru, Bayanwula, Chahanbulage) that record previously unrecognized Late Cenozoic activity. Active mountain building processes show remarkable variation from large horst blocks (Helanshan, SW Langshan, Yabrai) localized uplifts along sinistral wrench-belts (Bigesitai) dominantly (Longshoushan) transpressional ranges (Helishan). triangular wedge-shape likely pre-disposed it eastward extrusion response NE-directed India-Eurasia collision-derived compressional stresses south, E-W tensional forces driven Pacific margin rollback east. A combination inherited regional lithospheric structure modern east-directed geodetically derived crustal velocity led to: 1) thinning subsidence Ejina basin wake extruding 2) distributed transtension extension within interior, Hetao Yinchuan grabens

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ژورنال

عنوان ژورنال: Journal of Asian Earth Sciences

سال: 2021

ISSN: ['1878-5786', '1367-9120']

DOI: https://doi.org/10.1016/j.jseaes.2020.104597