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Lunar Gruithuisen and Mairan domes: rheology and mode of emplacement.

Wilson, Lionel and Head, James W. (2003) Lunar Gruithuisen and Mairan domes: rheology and mode of emplacement. Journal of Geophysical Research: Planets, 108 (E2). p. 5012. ISSN 2169-9100

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Abstract

The lunar steep-sided Gruithuisen and Mairan domes are morphologically and spectrally distinctive structures and appear similar to terrestrial extrusive volcanic features characterized by viscous magma. We use the basic morphologic and morphometric characteristics of the domes to estimate the yield strengths (∼105 Pa), plastic viscosities (∼109 Pa s), and effusion rates (∼50 m3/s) of the magmas which formed them. These values are similar to those of terrestrial rhyolites, dacites, and basaltic andesites and support the hypothesis that these domes are an unusual variation of typical highlands and mare compositions. The dikes which formed them are predicted to have had widths of ∼50 m and lengths of about 15 km. The magma rise speed implied by this geometry is very low, ∼7 × 10−5 m/s, and the Reynolds number of the motion is ∼2 × 10−8, implying a completely laminar flow regime. Estimates of emplacement duration range from one to several decades. These new calculations confirm the unusual nature of these features and support previous qualitative suggestions that they were formed from magmas with significantly higher viscosity than those typical of mare basalts.

Item Type: Article
Journal or Publication Title: Journal of Geophysical Research: Planets
Subjects: G Geography. Anthropology. Recreation > GE Environmental Sciences
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 21435
Deposited By: ep_ss_importer
Deposited On: 14 Jan 2009 13:09
Refereed?: Yes
Published?: Published
Last Modified: 17 Sep 2013 18:00
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/21435

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