Volcanic rifting at Martian grabens

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dc.contributor.author Garel, E.
dc.contributor.author Mege, D.
dc.contributor.author Lagabrielle, Y.
dc.contributor.author Cook, Anthony
dc.date.accessioned 2008-12-09T16:30:05Z
dc.date.available 2008-12-09T16:30:05Z
dc.date.issued 2003-05
dc.identifier.citation Garel , E , Mege , D , Lagabrielle , Y & Cook , A 2003 , ' Volcanic rifting at Martian grabens ' Journal of Geophysical Research: Planets , vol 108 , no. E5 , pp. 1-33 . , 10.1029/2002JE001852 en
dc.identifier.issn 2169-9100
dc.identifier.other PURE: 89578
dc.identifier.other dspace: 2160/1491
dc.identifier.uri http://hdl.handle.net/2160/1491
dc.description Cook, Anthony; Mege, D.; Garel, E.; Lagabrielle, Y., (2003) 'Volcanic rifting at Martian grabens', Journal of Geophysical Research 108(E5) pp. 1-33 RAE2008 en
dc.description.abstract A large fraction of surface extension on Mars occurred at segmented grabens having width/length ratios akin to oceanic rifts on Earth. Association with volcanic landforms such as pit craters clearly suggests interconnection between tectonic and magmatic processes. A Martian rift evolution model is proposed on the basis of new geomorphological and structural interpretations of imagery, high-resolution digital elevation models (DEMs), scaled experimental modeling and three-dimensional boundary element modeling of magmatic and tectonic processes, and a comparison with terrestrial rifts. The DEMs were obtained from Mars Observer Laser Altimeter, Viking Orbiter stereo images, or a combination of both. Comparison of terrestrial rifts included Afar, Iceland, and the East Pacific Rise. The ambient extensional stress field induced by regional body forces is combined at depth with decompression melting and mantle plume thermal anomaly, resulting in emplacement of elongated magma reservoirs along the grabens. Injection of dikes above the reservoirs and flood basalt eruption result in a reservoir underpressurization of up to hundreds of MPa and induces surface collapse. Each collapse event is associated with an eruption of volcanic volumes akin to those of individual flow eruptions in large terrestrial igneous provinces. The geometry and mechanisms of graben formation and surface collapse are described and used to infer reservoir depth and width. We conclude from this study that giant dike swarms akin to typical giant terrestrial dike swarms are unlikely to underlie the volcanic Martian grabens on the basis one graben-one dike. Rather, every volcanic graben segment appears to own a local dike swarm perhaps analogous to the dike swarms in the Icelandic fissure zones. en
dc.format.extent 33 en
dc.language.iso eng
dc.relation.ispartof Journal of Geophysical Research: Planets en
dc.subject rifting en
dc.subject graben en
dc.subject pit crater en
dc.subject magma chamber en
dc.subject dyke en
dc.title Volcanic rifting at Martian grabens en
dc.type Text en
dc.type.publicationtype Article (Journal) en
dc.identifier.doi http://dx.doi.org/10.1029/2002JE001852
dc.contributor.institution Institute of Mathematics & Physics (ADT) en
dc.contributor.institution Mathematics and Physics en
dc.description.status Peer reviewed en


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