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dc.contributor.authorChapman, James B.
dc.contributor.authorRobinson, Alexander C.
dc.contributor.authorCarrapa, Barbara
dc.contributor.authorVillarreal, Dustin
dc.contributor.authorWorthington, James
dc.contributor.authorDeCelles, Peter G.
dc.contributor.authorKapp, Paul
dc.contributor.authorGadoev, Mustafo
dc.contributor.authorOimahmadov, Ilhomjon
dc.contributor.authorGehrels, George
dc.date.accessioned2018-09-10T23:58:12Z
dc.date.available2018-09-10T23:58:12Z
dc.date.issued2018-08
dc.identifier.citationJames B. Chapman, Alexander C. Robinson, Barbara Carrapa, Dustin Villarreal, James Worthington, Peter G. DeCelles, Paul Kapp, Mustafo Gadoev, Ilhomjon Oimahmadov, George Gehrels; Cretaceous shortening and exhumation history of the South Pamir terrane. Lithosphere ; 10 (4): 494–511. doi: https://doi.org/10.1130/L691.1en_US
dc.identifier.issn1941-8264
dc.identifier.doi10.1130/L691.1
dc.identifier.urihttp://hdl.handle.net/10150/628675
dc.description.abstractDespite Miocene extension and exhumation of middle to lower crust in a series of gneiss domes and interpreted Cenozoic delamination of the lower crust, the crust in the modern Pamir Mountains is among the thickest in the world. Cenozoic shortening, crustal thickening, and prograde metamorphism in the Pamir have been associated with India-Asia collision. However, new mapping in the South Pamir terrane indicates relatively minor, distributed shortening since the Jurassic, which occurs in a thrust belt overprinted by late Cenozoic transpression. The thrust belt connects with the Rushan-Pshart suture zone, a Mesozoic terrane boundary. New detrital zircon U-Pb and detrital zircon fission track ages of synorogemc clastic rocks exposed in the footwall of thrust faults in the South Pamir thrust belt provide maximum deposition ages (76-112 Ma), which are interpreted to document Cretaceous shortening prior to India-Asia collision. Furthermore, zircon (U-Th)/He and apatite (U-Th)/He data from the South Pamir terrane generally record cooling ages of ca. 102-44 Ma, suggesting limited Cenozoic exhumation. These results (1) are consistent with widespread Cretaceous deformation throughout the Pamir-Tibet orogen with limited Cenozoic upper crustal shortening in the South Pamir terrane, (2) together with previous studies, allow for the possibility that the upper crust of the Pamir orogen was characterized by net extension during the Cenozoic rather than net shortening, and (3) are consistent with models that relate Cenozoic crustal thickening to the insertion of Indian lower crust beneath the Pamir. Lower crustal thickening of the South Pamir terrane is difficult to reconcile with the prograde metamorphic history of gneiss domes in the South Pamir terrane and may require a relatively shallow (<15-20 km) shear zone separating lower crustal contraction from upper crustal extension.en_US
dc.description.sponsorshipNational Science Foundation (NSF) [EAR-1450899]; NSF [EAR-1419748, EAR-0929777, 1338583]; American Philosophical Society; American Association of Petroleum Geologists; Geological Society of America; Exxon Mobil Corporationen_US
dc.language.isoenen_US
dc.publisherGEOLOGICAL SOC AMER, INCen_US
dc.relation.urlhttps://pubs.geoscienceworld.org/gsa/lithosphere/article/10/4/494/530504/Cretaceous-shortening-and-exhumation-history-ofen_US
dc.rights© The Authors. Gold Open Access: This paper is published under the terms of the CC-BY-NC license.en_US
dc.rights.urihttps://creativecommons.org/licenses/by-nc/4.0/
dc.titleCretaceous shortening and exhumation history of the South Pamir terraneen_US
dc.typeArticleen_US
dc.contributor.departmentUniv Arizona, Dept Geoscien_US
dc.identifier.journalLITHOSPHEREen_US
dc.description.note12 month embargo; published online: 18 April 2018en_US
dc.description.collectioninformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at repository@u.library.arizona.edu.en_US
dc.eprint.versionFinal accepted manuscripten_US
dc.source.journaltitleLithosphere
dc.source.volume10
dc.source.issue4
dc.source.beginpage494
dc.source.endpage511


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© The Authors. Gold Open Access: This paper is published under the terms of the CC-BY-NC license.
Except where otherwise noted, this item's license is described as © The Authors. Gold Open Access: This paper is published under the terms of the CC-BY-NC license.