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Discussion papers
https://doi.org/10.5194/se-2018-92
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.
https://doi.org/10.5194/se-2018-92
© Author(s) 2018. This work is distributed under
the Creative Commons Attribution 4.0 License.

Peer-reviewed comment 26 Sep 2018

Peer-reviewed comment | 26 Sep 2018

Review status
This discussion paper is a preprint. It is a manuscript under review for the journal Solid Earth (SE).

Comment on Marques et al. (2018), Channel flow, tectonic overpressure, and exhumation of high-pressure rocks in the Greater Himalayas

John P. Platt John P. Platt
  • Department of Earth Sciences, University of Southern California, Los Angeles, CA 90089-0740, USA

Abstract. The upward-tapering channel model proposed by Marques et al (2018) has a “base” that forms part of the subducting footwall, and will therefore not close the channel. As a result there will be no return flow, and excess pressure will not develop in the channel. The excess (dynamic) pressures calculated from their model, which exceed lithostatic pressure by as much as 1.5GPa, will cause elastic flexure of the upper plate, which will relieve the excess pressure. If the excess pressure is maintained by continued corner flow, flexure of the upper plate will lead to geologically unrealistic topographic and gravity anomalies.

John P. Platt
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Status: final response (author comments only)
AC: Author comment | RC: Referee comment | SC: Short comment | EC: Editor comment
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John P. Platt
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Short summary
The channel flow model proposed by Marques et al (2018) has a geometry that would allow any excess pressure to leak out downwards. The calculated values of excess pressure are so high that they would inflate the overlying rock layer like a balloon, largely relieving the pressure. If the excess pressure were maintained by continuing channel flow, the resulting topography would be several times higher than the present-day Himalayas.
The channel flow model proposed by Marques et al (2018) has a geometry that would allow any...
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