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 Fernando Ornelas Marques on behalf of the Authors (02 Jul 2018)

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)

AR by Fernando Ornelas Marques on behalf of the Authors (08 Aug 2018) Manuscript

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.