Segmentation of the Tashkurgan normal fault in the eastern Pamir: Insights from geomorphology and thermochronology and implications for fault-slip transfer
dc.contributor.author
Chen, Shenqiang
dc.contributor.author
Fellin, Maria Giuditta
dc.contributor.author
Willett, Sean D.
dc.contributor.author
Maden, Colin
dc.contributor.author
Guillong, Marcel
dc.contributor.author
Chen, Hanlin
dc.contributor.author
Chen, Yaguang
dc.contributor.author
Yang, Rong
dc.date.accessioned
2024-04-30T08:16:59Z
dc.date.available
2024-04-13T06:13:42Z
dc.date.available
2024-04-30T08:16:59Z
dc.date.issued
2024-05-10
dc.identifier.issn
0040-1951
dc.identifier.issn
1879-3266
dc.identifier.other
10.1016/j.tecto.2024.230305
en_US
dc.identifier.uri
http://hdl.handle.net/20.500.11850/668671
dc.identifier.doi
10.3929/ethz-b-000668671
dc.description.abstract
At the northwestern end of the India–Asia collision zone, in the eastern Pamir interior, the Kongur Shan extensional system extends for ∼250 km as a composite system of normal faults. As the southernmost segment of the extensional system, the Tashkurgan fault can be divided into a northern and southern segment by the intersection of the Tahman and Tashkurgan faults. To evaluate the tectonic activity along the Tashkurgan fault and explore the extensional characteristics of the southern Kongur Shan extensional system, we integrate geomorphologic analysis with thermochronologic data and modeling. Geomorphic indices, including local relief, normalized channel steepness index (kₛₙ), and river χ-plots, show that the southern Tashkurgan fault is more active than the northern Tashkurgan fault. On the footwall of the northern Tashkurgan fault, most thermochronologic data, which include biotite ⁴⁰Ar/³⁹Ar (Arbt), zircon (U-Th)/He (ZHe), apatite fission track (AFT), and apatite (U-Th-Sm)/He (AHe) dates, record emplacement-related cooling, and only a few AHe dates possibly record exhumation of <2 km since ∼7 Ma ago. On the footwall of the southern Tashkurgan fault, almost all of the ZHe, AFT, and AHe dates record significant late Miocene to present exhumation; thus, we perform three-dimensional thermokinematic modeling for the normal slip along this fault segment. Modeling results indicate a probably constant slip rate on the southern Tashkurgan fault at a value of 1.4–1.5 mm/a, which corresponds to 6–7 km of both horizontal extension and footwall uplift since 6.5 Ma ago. All together, the geomorphic and thermochronologic evidences imply that the southern Tashkurgan fault is responsible for the ∼E–W extension along the southernmost portion of the Kongur Shan extensional system, while the northern fault segment plays a minor role in the extension. This result, combined with the previously published magnitude of extension along the southern Kongur Shan fault, indicates that the extension at any site along the southern Kongur Shan extensional system can be primarily attributed to normal faulting along a single border fault, which is a typical characteristic of an interbasin transfer zone with a transfer fault.
en_US
dc.format
application/pdf
en_US
dc.language.iso
en
en_US
dc.publisher
Elsevier
en_US
dc.rights.uri
http://creativecommons.org/licenses/by/4.0/
dc.subject
Pamir
en_US
dc.subject
Normal faulting
en_US
dc.subject
Geomorphology
en_US
dc.subject
Thermochronology
en_US
dc.subject
Thermokinematic modeling
en_US
dc.title
Segmentation of the Tashkurgan normal fault in the eastern Pamir: Insights from geomorphology and thermochronology and implications for fault-slip transfer
en_US
dc.type
Journal Article
dc.rights.license
Creative Commons Attribution 4.0 International
dc.date.published
2024-04-02
ethz.journal.title
Tectonophysics
ethz.journal.volume
878
en_US
ethz.journal.abbreviated
Tectonophysics
ethz.pages.start
230305
en_US
ethz.size
15 p.
en_US
ethz.version.deposit
publishedVersion
en_US
ethz.identifier.wos
ethz.identifier.scopus
ethz.publication.status
published
en_US
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erd- und Planetenwissenschaften / Dep. of Earth and Planetary Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03956 - Vance, Derek / Vance, Derek
ethz.leitzahl
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erd- und Planetenwissenschaften / Dep. of Earth and Planetary Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03946 - Schönbächler, Maria / Schönbächler, Maria
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erd- und Planetenwissenschaften / Dep. of Earth and Planetary Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03956 - Vance, Derek / Vance, Derek
ethz.leitzahl.certified
ETH Zürich::00002 - ETH Zürich::00012 - Lehre und Forschung::00007 - Departemente::02330 - Dep. Erd- und Planetenwissenschaften / Dep. of Earth and Planetary Sciences::02725 - Institut für Geochemie und Petrologie / Institute of Geochemistry and Petrology::03946 - Schönbächler, Maria / Schönbächler, Maria
ethz.date.deposited
2024-04-13T06:13:44Z
ethz.source
SCOPUS
ethz.eth
yes
en_US
ethz.availability
Open access
en_US
ethz.rosetta.installDate
2024-04-30T08:17:01Z
ethz.rosetta.lastUpdated
2024-04-30T08:17:01Z
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true
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true
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