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Article: Neogene Kinematic Evolution and Exhumation of the NW India Himalaya: Zircon Geo‐and Thermochronometric Insights From the Fold‐Thrust Belt and Foreland Basin

TitleNeogene Kinematic Evolution and Exhumation of the NW India Himalaya: Zircon Geo‐and Thermochronometric Insights From the Fold‐Thrust Belt and Foreland Basin
Authors
Keywordsfold-thrust belt
geochronology
Himalaya
India
thermochronology
Issue Date2019
PublisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1944-9194/
Citation
Tectonics, 2019, v. 38 n. 6, p. 2059-2086 How to Cite?
AbstractThe kinematic and exhumational evolution of the Lesser Himalaya (LH) remains a topic of debate. In NW India, the stratigraphically diverse LH is separated into the inner LH (iLH) of late Paleo‐Mesoproterozoic rocks and the outer LH (oLH) of Cryogenian to Cambrian rocks. Contradictory models regarding the age and structural affinity of the Tons thrust—a prominent structure bounding the oLH and iLH—are grounded in conflicting positions of the oLH prior to Himalayan orogenesis. This study presents new zircon (U‐Th)/He and U‐Pb ages from the thrust belt and foreland basin of NW India that refine the kinematic and exhumational evolution of the LH. Combined cooling ages and foreland provenance data support emplacement and unroofing of the oLH via southward in‐sequence propagation of the Tons thrust by middle Miocene time. This requires that, before India–Asia collision, the oLH was positioned as the southernmost succession of Neoproterozoic–Cambrian strata along the north Indian margin. This is further supported by detrital zircon U‐Pb ages from Cretaceous–Paleogene strata (Singtali Formation) unconformably overlying the oLH, which yield diagnostic Cretaceous detrital zircons correlative with coeval strata in the frontal Himalaya of Nepal. A pulse of rapid exhumation along the Tons thrust front at ~16 Ma was followed by east‐to‐west development of a midcrustal ramp at ~12 Ma which facilitated diachronous iLH duplexing. This duplexing shifted the locus of maximum exhumation northward, eroding away Main Central Thrust hanging wall rocks until the iLH breached the surface at ~9–11 Ma near Nepal and by ~3–7 Ma within the Kullu‐Rampur window.
Persistent Identifierhttp://hdl.handle.net/10722/274981
ISSN
2020 Impact Factor: 4.851
2020 SCImago Journal Rankings: 2.465
ISI Accession Number ID

 

DC FieldValueLanguage
dc.contributor.authorColleps, CC-
dc.contributor.authorStockli, DF-
dc.contributor.authorMcKenzie, NR-
dc.contributor.authorHorton, BK-
dc.contributor.authorWebb, AAG-
dc.date.accessioned2019-09-10T02:32:55Z-
dc.date.available2019-09-10T02:32:55Z-
dc.date.issued2019-
dc.identifier.citationTectonics, 2019, v. 38 n. 6, p. 2059-2086-
dc.identifier.issn0278-7407-
dc.identifier.urihttp://hdl.handle.net/10722/274981-
dc.description.abstractThe kinematic and exhumational evolution of the Lesser Himalaya (LH) remains a topic of debate. In NW India, the stratigraphically diverse LH is separated into the inner LH (iLH) of late Paleo‐Mesoproterozoic rocks and the outer LH (oLH) of Cryogenian to Cambrian rocks. Contradictory models regarding the age and structural affinity of the Tons thrust—a prominent structure bounding the oLH and iLH—are grounded in conflicting positions of the oLH prior to Himalayan orogenesis. This study presents new zircon (U‐Th)/He and U‐Pb ages from the thrust belt and foreland basin of NW India that refine the kinematic and exhumational evolution of the LH. Combined cooling ages and foreland provenance data support emplacement and unroofing of the oLH via southward in‐sequence propagation of the Tons thrust by middle Miocene time. This requires that, before India–Asia collision, the oLH was positioned as the southernmost succession of Neoproterozoic–Cambrian strata along the north Indian margin. This is further supported by detrital zircon U‐Pb ages from Cretaceous–Paleogene strata (Singtali Formation) unconformably overlying the oLH, which yield diagnostic Cretaceous detrital zircons correlative with coeval strata in the frontal Himalaya of Nepal. A pulse of rapid exhumation along the Tons thrust front at ~16 Ma was followed by east‐to‐west development of a midcrustal ramp at ~12 Ma which facilitated diachronous iLH duplexing. This duplexing shifted the locus of maximum exhumation northward, eroding away Main Central Thrust hanging wall rocks until the iLH breached the surface at ~9–11 Ma near Nepal and by ~3–7 Ma within the Kullu‐Rampur window.-
dc.languageeng-
dc.publisherAmerican Geophysical Union. The Journal's web site is located at http://agupubs.onlinelibrary.wiley.com/agu/journal/10.1002/(ISSN)1944-9194/-
dc.relation.ispartofTectonics-
dc.rightsTectonics. Copyright © American Geophysical Union.-
dc.rightsPublished version Copyright [year] American Geophysical Union. To view the published open abstract, go to https://doi.org/[DOI].-
dc.subjectfold-thrust belt-
dc.subjectgeochronology-
dc.subjectHimalaya-
dc.subjectIndia-
dc.subjectthermochronology-
dc.titleNeogene Kinematic Evolution and Exhumation of the NW India Himalaya: Zircon Geo‐and Thermochronometric Insights From the Fold‐Thrust Belt and Foreland Basin-
dc.typeArticle-
dc.identifier.emailMcKenzie, NR: ryan00@hku.hk-
dc.identifier.authorityMcKenzie, NR=rp02198-
dc.identifier.doi10.1029/2018TC005304-
dc.identifier.scopuseid_2-s2.0-85068088237-
dc.identifier.hkuros304942-
dc.identifier.volume38-
dc.identifier.issue6-
dc.identifier.spage2059-
dc.identifier.epage2086-
dc.identifier.isiWOS:000475363100011-
dc.publisher.placeUnited States-
dc.identifier.issnl0278-7407-

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