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Assessing the kinematics and subsurface geometry of the central Nepal Himalayas: Insights from thermokinematic modeling

Ghoshal, Suryodoy (2021) Assessing the kinematics and subsurface geometry of the central Nepal Himalayas: Insights from thermokinematic modeling. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

We couple detailed, sequentially forward modeled balanced cross-sections through the central Nepal Himalaya, including flexural isostasy and erosion with a thermokinematic model (PECUBE) to provide insight into the geometry of the Main Himalayan thrust (MHT), and its structural and thermal evolution. These models are constrained by new and existing geologic mapping at the surface and a large, high-resolution dataset of thermochronological ages. Our modeling shows that the location and temporal evolution of ramps exert a first-order control on the distribution of cooling ages, and that this can be used to invalidate proposed models for the subsurface in the Himalaya. We also show how the location, geometry and rates of uplift and exhumation in the Himalaya has responded to increases in the strength of the south Asian monsoon over time. We highlight the importance of out-of-sequence faulting on the distribution of cooling ages at the surface, and its effect on topography. Finally, combining the individual 2D kinematic models allows us to create a 3D kinematic model of central Nepal, and assess whether mapped changes in geology, and cooling ages are the result of along-strike changes in the geometry of the modern MHT ramp, or due to critical changes in the geometry of the MHT in the past.


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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Ghoshal, Suryodoysug32@pitt.edusug320000-0002-3218-5260
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairMcQuarrie, Nadinenmcq@pitt.edunmcq0000-0001-6529-778X
Committee MemberShelef, Eitanshelef@pitt.edu0000-0003-0672-5144
Committee MemberStewart, Brianbstewart@pitt.edu
Committee MemberJones, Charlescejones@pitt.edu
Committee MemberEhlers, Toddtodd.ehlers@uni-tuebingen.de0000-0001-9436-0303
Date: 12 October 2021
Date Type: Publication
Defense Date: 3 May 2021
Approval Date: 12 October 2021
Submission Date: 28 July 2021
Access Restriction: 1 year -- Restrict access to University of Pittsburgh for a period of 1 year.
Number of Pages: 281
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Geology and Planetary Science
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Himalaya; Nepal; thermokinematic modeling; thermochronology; balanced cross-sections;
Related URLs:
Date Deposited: 12 Oct 2021 12:55
Last Modified: 12 Oct 2021 12:55
URI: http://d-scholarship.pitt.edu/id/eprint/41512

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