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Seismotectonic range-front segmentation and mountain-belt growth in the Pamir-Alai region, Kyrgyzstan (India-Eurasia collision zone)

1999; Geological Society of America; Volume: 111; Issue: 11 Linguagem: Inglês

10.1130/0016-7606(1999)111 2.3.co;2

1943-2674

J Ramón Arrowsmith, Manfred R. Strecker,

Geological and Geochemical Analysis

Research Article| November 01, 1999 Seismotectonic range-front segmentation and mountain-belt growth in the Pamir-Alai region, Kyrgyzstan (India-Eurasia collision zone) J R. Arrowsmith; J R. Arrowsmith 1Department of Geology, Arizona State University, Tempe, Arizona 85287 Search for other works by this author on: GSW Google Scholar M. R. Strecker M. R. Strecker 2Institut für Geowissenschaften, Universität Potsdam, Postfach 60 15 53, D-14415 Potsdam, Germany Search for other works by this author on: GSW Google Scholar Author and Article Information J R. Arrowsmith 1Department of Geology, Arizona State University, Tempe, Arizona 85287 M. R. Strecker 2Institut für Geowissenschaften, Universität Potsdam, Postfach 60 15 53, D-14415 Potsdam, Germany Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1999) 111 (11): 1665–1683. https://doi.org/10.1130/0016-7606(1999)111 2.3.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation J R. Arrowsmith, M. R. Strecker; Seismotectonic range-front segmentation and mountain-belt growth in the Pamir-Alai region, Kyrgyzstan (India-Eurasia collision zone). GSA Bulletin 1999;; 111 (11): 1665–1683. doi: https://doi.org/10.1130/0016-7606(1999)111 2.3.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract The Trans Alai Range along the northern perimeter of the Pamir region of Kyrgyzstan is at the northern edge of the India-Eurasia collision zone. The range defines a section of Main Pamir thrust, which is divided into eastern, central, and western segments that record differential absorption of plate convergence. The 50-km-long, east-west–striking, central fault segment of the Main Pamir thrust has dip-slip thrust fault offsets (with a minimum Holocene dip-slip rate of ∼6 mm/yr) and is linked to the other segments via northwest-striking dextral transfer. The western transfer faults are well characterized geomorphically, and the westernmost records the predominant transition to north-vergent thrusting along the western segment via north-vergent, low-angle thrust faults rooted in a steeply south-dipping dextral shear zone. In contrast, the eastern segment deformation is widely distributed and geomorphically less evident, but the transfer also takes place in a structurally complex zone. Asymmetric offset of a regionally correlated terrace, geomorphic zonation, and the distribution of historic earthquakes suggest that the central segment is mechanically linked with the western segment, but not with the eastern segment. The progressive closure of the Alai Valley by the northward advance of thrusting exemplifies the annihilation of an intramontane basin. If the high surface uplift rates implied by these geologic observations have been maintained for the last few million years, they attest to the high level of tectonic activity and the recency of construction of the Trans Alai Range. This content is PDF only. Please click on the PDF icon to access. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.