Channel flow, tectonic overpressure, and exhumation of high-pressure rocks in the Greater Himalayas

Marques, Fernando O.; Mandal, Nibir; Ghosh, Subhajit; Ranalli, Giorgio; Bose, Santanu

doi:https://doi.org/10.5194/se-9-1061-2018

Articles | Volume 9, issue 5

https://doi.org/10.5194/se-9-1061-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

https://doi.org/10.5194/se-9-1061-2018

© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Articles | Volume 9, issue 5

Research article

|

10 Sep 2018

Research article |

| 10 Sep 2018

Channel flow, tectonic overpressure, and exhumation of high-pressure rocks in the Greater Himalayas

Fernando O. Marques, Nibir Mandal, Subhajit Ghosh, Giorgio Ranalli, and Santanu Bose

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Final revised paper (published on 10 Sep 2018)
Preprint (discussion started on 04 May 2018)

Interactive discussion

Status: closed

AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment

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- Supplement

RC1: 'Comments', Anonymous Referee #1, 31 May 2018
- AC1: 'Response to Reviewer#1's comments', Fernando Ornelas Marques, 16 Jun 2018
RC2: 'Review: Channel Flow, tectonic overpressure, and exhumation of high-pressure rocks in the Greater Himalayas', Anonymous Referee #2, 21 Jun 2018
- AC2: 'Response to Reviewer#2's comments', Fernando Ornelas Marques, 29 Jun 2018
- AC3: 'Response to Reviewer#2's comments', Fernando Ornelas Marques, 01 Jul 2018

Peer-review completion

AR: Author's response | RR: Referee report | ED: Editor decision

AR by Anna Wenzel on behalf of the Authors (05 Jul 2018) Author's response Manuscript

ED: Publish subject to technical corrections (09 Jul 2018) by Taras Gerya

ED: Publish subject to technical corrections (09 Jul 2018) by Federico Rossetti(Executive Editor)

Short summary

We couple Himalayan tectonics to numerical simulations to show how upward-tapering channel (UTC) flow can be used to explain the evidence. The simulations predict high tectonic overpressure (TOP > 2), which increases exponentially with a decrease in UTC mouth width, and with increase in velocity and channel viscosity. The highest TOP occurs at depths < −60 km, which, combined with the flow in the UTC, forces high-pressure rocks to exhume along the channel’s hanging wall, as in the Himalayas.