The P-T-t-D evolution of the Mahabharat, east-central Nepal: The out-of-sequence development of the Himalaya
A garnet-bearing schist from the southernmost such exposure along the Himalaya in east central Nepal records prograde metamorphism at 32.4 ± 0.3 Ma. Phase equilibria modelling, combined with Ti-in-biotite and quartz c-axis thermometry, outline a tight-to-hairpin pressure-temperature (P-T) path ex...
| Main Authors: | , , , |
|---|---|
| Format: | Article |
| Language: | English |
| Published: |
Elsevier
2022-03-01
|
| Series: | Geoscience Frontiers |
| Subjects: | |
| Online Access: | http://www.sciencedirect.com/science/article/pii/S167498712030181X |
| _version_ | 1797722030891597824 |
|---|---|
| author | Kyle P. Larson Sudip Shrestha Mathieu Soret Matthijs Smit |
| author_facet | Kyle P. Larson Sudip Shrestha Mathieu Soret Matthijs Smit |
| author_sort | Kyle P. Larson |
| collection | DOAJ |
| description | A garnet-bearing schist from the southernmost such exposure along the Himalaya in east central Nepal records prograde metamorphism at 32.4 ± 0.3 Ma. Phase equilibria modelling, combined with Ti-in-biotite and quartz c-axis thermometry, outline a tight-to-hairpin pressure-temperature (P-T) path extending from ~515 °C and 5.5 kbar to peak conditions at ~575 °C and 7 kbar followed by deformation during the retrograde phase at 480–515 °C and 6–7 kbar. The new geochronology data place an upper bound on the evolution of metamorphism and deformation in the frontal-most part of the Himalaya, which lasted until 17.5 Ma, as indicated by previously published 40Ar/39Ar data. The P-T-time data from this part of the Himalaya, as well as that from more hinterland-ward portions of the orogen, outline a progressive, stepwise, commonly out-of-sequence evolution. Further data from along the orogen indicates that this evolution is not a local phenomenon, but instead characterizes the tectonics of this system as a whole. |
| first_indexed | 2024-03-12T09:41:40Z |
| format | Article |
| id | doaj.art-05d78d94456b4f76867d3c1e217f8de7 |
| institution | Directory Open Access Journal |
| issn | 1674-9871 |
| language | English |
| last_indexed | 2024-03-12T09:41:40Z |
| publishDate | 2022-03-01 |
| publisher | Elsevier |
| record_format | Article |
| series | Geoscience Frontiers |
| spelling | doaj.art-05d78d94456b4f76867d3c1e217f8de72023-09-02T13:09:05ZengElsevierGeoscience Frontiers1674-98712022-03-01132101057The P-T-t-D evolution of the Mahabharat, east-central Nepal: The out-of-sequence development of the HimalayaKyle P. Larson0Sudip Shrestha1Mathieu Soret2Matthijs Smit3Department of Earth, Environmental and Geographic Sciences, University of British Columbia Okanagan, 3247 University Way, Kelowna, BC V1V 1V7, Canada; Corresponding author.Department of Earth, Environmental and Geographic Sciences, University of British Columbia Okanagan, 3247 University Way, Kelowna, BC V1V 1V7, CanadaDepartment of Earth, Environmental and Geographic Sciences, University of British Columbia Okanagan, 3247 University Way, Kelowna, BC V1V 1V7, CanadaDepartment of Earth, Ocean and Atmospheric Sciences, University of British Columbia Vancouver, 2020-2207 Main Mall, Vancouver, BC V6T 1Z4, CanadaA garnet-bearing schist from the southernmost such exposure along the Himalaya in east central Nepal records prograde metamorphism at 32.4 ± 0.3 Ma. Phase equilibria modelling, combined with Ti-in-biotite and quartz c-axis thermometry, outline a tight-to-hairpin pressure-temperature (P-T) path extending from ~515 °C and 5.5 kbar to peak conditions at ~575 °C and 7 kbar followed by deformation during the retrograde phase at 480–515 °C and 6–7 kbar. The new geochronology data place an upper bound on the evolution of metamorphism and deformation in the frontal-most part of the Himalaya, which lasted until 17.5 Ma, as indicated by previously published 40Ar/39Ar data. The P-T-time data from this part of the Himalaya, as well as that from more hinterland-ward portions of the orogen, outline a progressive, stepwise, commonly out-of-sequence evolution. Further data from along the orogen indicates that this evolution is not a local phenomenon, but instead characterizes the tectonics of this system as a whole.http://www.sciencedirect.com/science/article/pii/S167498712030181XHimalayaMetamorphismKinematicsLu–Hf GeochronologyNepal |
| spellingShingle | Kyle P. Larson Sudip Shrestha Mathieu Soret Matthijs Smit The P-T-t-D evolution of the Mahabharat, east-central Nepal: The out-of-sequence development of the Himalaya Geoscience Frontiers Himalaya Metamorphism Kinematics Lu–Hf Geochronology Nepal |
| title | The P-T-t-D evolution of the Mahabharat, east-central Nepal: The out-of-sequence development of the Himalaya |
| title_full | The P-T-t-D evolution of the Mahabharat, east-central Nepal: The out-of-sequence development of the Himalaya |
| title_fullStr | The P-T-t-D evolution of the Mahabharat, east-central Nepal: The out-of-sequence development of the Himalaya |
| title_full_unstemmed | The P-T-t-D evolution of the Mahabharat, east-central Nepal: The out-of-sequence development of the Himalaya |
| title_short | The P-T-t-D evolution of the Mahabharat, east-central Nepal: The out-of-sequence development of the Himalaya |
| title_sort | p t t d evolution of the mahabharat east central nepal the out of sequence development of the himalaya |
| topic | Himalaya Metamorphism Kinematics Lu–Hf Geochronology Nepal |
| url | http://www.sciencedirect.com/science/article/pii/S167498712030181X |
| work_keys_str_mv | AT kyleplarson thepttdevolutionofthemahabharateastcentralnepaltheoutofsequencedevelopmentofthehimalaya AT sudipshrestha thepttdevolutionofthemahabharateastcentralnepaltheoutofsequencedevelopmentofthehimalaya AT mathieusoret thepttdevolutionofthemahabharateastcentralnepaltheoutofsequencedevelopmentofthehimalaya AT matthijssmit thepttdevolutionofthemahabharateastcentralnepaltheoutofsequencedevelopmentofthehimalaya AT kyleplarson pttdevolutionofthemahabharateastcentralnepaltheoutofsequencedevelopmentofthehimalaya AT sudipshrestha pttdevolutionofthemahabharateastcentralnepaltheoutofsequencedevelopmentofthehimalaya AT mathieusoret pttdevolutionofthemahabharateastcentralnepaltheoutofsequencedevelopmentofthehimalaya AT matthijssmit pttdevolutionofthemahabharateastcentralnepaltheoutofsequencedevelopmentofthehimalaya |