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dc.contributor.authorReiners, Peter W.
dc.contributor.authorZhang, Huiping
dc.contributor.authorOskin, Michael E.
dc.contributor.authorLiu-Zeng, Jing
dc.contributor.authorZhang, Peizhen
dc.contributor.authorXiao, Ping
dc.date.accessioned2016-11-08T23:23:41Z
dc.date.available2016-11-08T23:23:41Z
dc.date.issued2016-09-01
dc.identifier.issn0012-821X
dc.identifier.doi10.1016/j.epsl.2016.05.048
dc.identifier.urihttp://hdl.handle.net/10150/621300
dc.description.abstractRiver incision into a widespread, upland low-relief landscape, and related patterns of exhumation recorded by low-temperature thermochronology, together underpin geodynamic interpretations for crustal thickening and uplift of the eastern Tibetan Plateau. We report results from a suite of 11 (U-Th-Sm)/He cooling-age samples. Eight samples comprise a 1.2 km relief section collected from elevations up to 4800 m in the Jiulong Shan, an elevated, rugged region located in the hinterland of the Yalong-Longmen Shan Thrust Belt, and surrounded on three sides by upland low-relief landscape surfaces. Zircon and apatite cooling ages record two episodes of rapid exhumation in the early Oligocene and late Miocene, that were separated by a period of stability from similar to 30 to 15 Ma. The first episode is consistent with a similar pulse evident from the Longmen Shan. The second episode is ongoing, and when integrated with adjacent cooling-age data sets, shows that doming of the Jiulong Shan has resulted in 2 to 4 km of differential exhumation of the plateau interior. We show from a compilation of glacial landform-mapping that the elevation of the plateau surface closely tracks global last glacial maximum equilibrium line altitude. We hypothesize that smoothing of highlands by efficient glacial and periglacial erosion, coupled with potential river captures and conveyance of sediments via external drainage, can yield an apparently continuous low-relief plateau landscape formed diachronously at high elevation. (C) 2016 Elsevier B.V. All rights reserved.
dc.description.sponsorshipNational Science Foundation of China [41172179, 41225010, 41272196]; Strategic Priority Research Program of the CAS [XDB03020201]; NSF [EAR-1050060]en
dc.language.isoenen
dc.publisherELSEVIER SCIENCE BVen
dc.rights© 2016 Elsevier B.V. All rights reserved.en
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/
dc.subjectlow-temperature thermochronologyen
dc.subjectpulsed exhumationen
dc.subjecteastern Tibeten
dc.subjectlow-relief surfacesen
dc.subjectlandscape evolutionen
dc.titlePulsed exhumation of interior eastern Tibet: Implications for relief generation mechanisms and the origin of high-elevation planation surfacesen
dc.typeArticleen
dc.contributor.departmentUniv Arizona, Dept Geoscien
dc.identifier.journalEARTH AND PLANETARY SCIENCE LETTERSen
dc.description.note24 Month Embargo.en
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
dc.eprint.versionFinal accepted manuscripten
html.description.abstractRiver incision into a widespread, upland low-relief landscape, and related patterns of exhumation recorded by low-temperature thermochronology, together underpin geodynamic interpretations for crustal thickening and uplift of the eastern Tibetan Plateau. We report results from a suite of 11 (U-Th-Sm)/He cooling-age samples. Eight samples comprise a 1.2 km relief section collected from elevations up to 4800 m in the Jiulong Shan, an elevated, rugged region located in the hinterland of the Yalong-Longmen Shan Thrust Belt, and surrounded on three sides by upland low-relief landscape surfaces. Zircon and apatite cooling ages record two episodes of rapid exhumation in the early Oligocene and late Miocene, that were separated by a period of stability from similar to 30 to 15 Ma. The first episode is consistent with a similar pulse evident from the Longmen Shan. The second episode is ongoing, and when integrated with adjacent cooling-age data sets, shows that doming of the Jiulong Shan has resulted in 2 to 4 km of differential exhumation of the plateau interior. We show from a compilation of glacial landform-mapping that the elevation of the plateau surface closely tracks global last glacial maximum equilibrium line altitude. We hypothesize that smoothing of highlands by efficient glacial and periglacial erosion, coupled with potential river captures and conveyance of sediments via external drainage, can yield an apparently continuous low-relief plateau landscape formed diachronously at high elevation. (C) 2016 Elsevier B.V. All rights reserved.


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