Inherited strike-slip faults as an origin for basement-cored uplifts: example of the Kungey and Zailiskey Ranges, northern Tian Shan Public Deposited

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  • March 20, 2019
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  • Selander, Jacob
    • Affiliation: College of Arts and Sciences, Department of Geological Sciences
Abstract
  • Reactivation of strike-slip faults and formation of new faults in the surrounding crust may be a common origin for high-angle reverse faults characteristic of basement-cored uplifts. This relationship is explored here by examining the growth of the Kungey and Zailiskey Ranges, the northernmost of the Kyrgyz and Kazakh Tian Shan. These ranges are cored by the inherited, ENE-striking Kemin-Chilik fault. Range growth in response to the northward propagation of the Tian Shan has taken place along a network of steeply-dipping faults surrounding the Kemin-Chilik fault. Structual relief is recorded by the deformation of a previously planar unconformity separating Paleozoic basement from Neogene strata. Late Quaternary deformation inferred from deformed river terraces is consistent with the long-term pattern of range growth. Interpretations of cross-sectional fault geometries are consistent with predictions from a mechanical model of slip partitioning developed by an obliquely-slipping, steeply-dipping, reactivated fault at depth.
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  • Oskin, Michael
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