Evidence for a massive phreatomagmatic eruption in the initial stages of formation of the Mangala Valles outflow channel, Mars.

Wilson, Lionel and Head, James W. (2004) Evidence for a massive phreatomagmatic eruption in the initial stages of formation of the Mangala Valles outflow channel, Mars. Geophysical Research Letters, 31. L15701. ISSN 0094-8276

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Abstract

New data reveal the presence of a system of parallel dune-like ridges extending in a band for up to 25–30 km around the eastern margin of the source trough for the Mangala Valles outflow channel system. We interpret these ridges to be formed during initial phreatomagmatic activity caused by dike emplacement, cryospheric cracking, magma-groundwater mixing, and explosive eruption to the surface. The erupted material consisted of fragmented magma, steam, and country rock which expanded from a choked state at the surface vent to form a near-ballistic, Io-like eruption plume. Outward flow of the plume at velocities of ∼430 m/s from a ∼30–60 km-long section of the graben is interpreted to have formed the system of dune-like ridges. Subsequent outpouring of groundwater formed the Mangala Valles outflow channel system.

Item Type: Journal Article
Journal or Publication Title: Geophysical Research Letters
Uncontrolled Keywords: /dk/atira/pure/researchoutput/libraryofcongress/ge
Subjects:
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21362
Deposited By: ep_ss_importer
Deposited On: 12 Jan 2009 11:21
Refereed?: Yes
Published?: Published
Last Modified: 06 Aug 2019 00:42
URI: https://eprints.lancs.ac.uk/id/eprint/21362

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