Ghoshal, Suryodoy
(2021)
Assessing the kinematics and subsurface geometry of the central Nepal Himalayas: Insights from thermokinematic modeling.
Doctoral Dissertation, University of Pittsburgh.
(Unpublished)
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
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| Status: |
Unpublished |
| Creators/Authors: |
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| ETD Committee: |
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| 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: |
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| Date Deposited: |
12 Oct 2021 12:55 |
| Last Modified: |
12 Oct 2022 05:15 |
| URI: |
http://d-scholarship.pitt.edu/id/eprint/41512 |
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