Evaluating Himalayan tectonic models using the Almora-Dadeldhura klippe

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dc.contributor Cemen, Ibrahim
dc.contributor Genareau, Kimberly D.
dc.contributor Davis, Lisa
dc.contributor.advisor Robinson, D. M.
dc.contributor.author Bosu, Somiddho
dc.contributor.other University of Alabama Tuscaloosa
dc.date.accessioned 2019-08-01T14:24:19Z
dc.date.available 2019-08-01T14:24:19Z
dc.date.issued 2019
dc.identifier.other u0015_0000001_0003341
dc.identifier.other Bosu_alatus_0004M_13769
dc.identifier.uri http://ir.ua.edu/handle/123456789/6154
dc.description Electronic Thesis or Dissertation en_US
dc.description.abstract The Greater Himalayan klippen are erosionally isolated, thrust bounded rocks, overlying Lesser Himalayan rocks in the Himalayan thrust belt. Structural and thermochronological data gathered in the klippen illuminate how Greater Himalayan rocks were emplaced and deformed between ~30-10 Ma. The Almora-Dadeldhura klippe in northwest India and far western Nepal is composed of rocks with Greater and Tethyan Himalayan affinities. Researchers use interpretations of rock affinity, number of shear zones, metamorphic gradient, thermochronology and microstructural data to support the critical taper, channel flow, or wedge insertion models for the development of the Himalayan thrust belt. Channel flow is not supported if the timing of the Main Central Thrust (MCT) and South Tibet Detachment System (STDS) are interpreted to be different. Wedge insertion is not supported if the STDS in the hinterland and klippe are the same fault but do not slip at the same time. The critical taper model is the most difficult to refute because the model can accommodate slip in almost any part of a thrust belt as the thrust belt responds to maintain critical taper. The already published and original data, that support or refute each of the models are presented. A kinematic model is developed combining the existing thermochronology and structural data. In this model, the Almora-Dadeldhura klippe was emplaced over Lesser Himalayan rocks between 28-18 Ma if the klippe was formed by an intra-Greater Himalayan thrust or between 18-13 Ma if the fault that forms the klippe is the Main Central thrust. The building of the Lesser Himalayan duplex folded the overlying klippe rock to dip southward between at ~10-4 Ma. The northern part of the klippe was folded to dip south, beginning between 7-5 Ma due to the emplacement of the Main Boundary thrust and the Subhimalayan thrust system. This fits a model of forward propagating thrust system and conforms with the predictions of the critical taper model. en_US
dc.format.extent 52 p.
dc.format.medium electronic
dc.format.mimetype application/pdf
dc.language English
dc.language.iso en_US
dc.publisher University of Alabama Libraries
dc.relation.ispartof The University of Alabama Electronic Theses and Dissertations
dc.relation.ispartof The University of Alabama Libraries Digital Collections
dc.relation.hasversion born digital
dc.rights All rights reserved by the author unless otherwise indicated. en_US
dc.subject Geology
dc.title Evaluating Himalayan tectonic models using the Almora-Dadeldhura klippe en_US
dc.type thesis
dc.type text
etdms.degree.department University of Alabama. Department of Geological Sciences
etdms.degree.discipline Geology
etdms.degree.grantor The University of Alabama
etdms.degree.level master's
etdms.degree.name M.S.

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