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dc.creatorDalton, Heather Anne
dc.date.accessioned 2011-07-25T02:07:30Z
dc.date.available 2011-07-25T02:07:30Z
dc.date.issued 2010
dc.identifier.urihttps://hdl.handle.net/1911/62206
dc.description.abstract Meteorite RBT04262 is one of only two Martian meteorites made of composite lithologies. Lithology 1 is composed of coarse-grained olivines enclosed in poikilitic pigeonites, resembling lherzolitic shergottites. Lithology 2 is finer-grained and composed of olivine phenocrysts set within a groundmass of augite, olivine, plagioclase (shocked to maskelynite) and accessory phases such as Ca-phosphates, representing an olivine-phyric shergottite. Lithology 1 may be an early-formed cumulate while Lithology 2 may represent a cooled liquid laden with accumulated olivine crystals. Geochemical and textural observations suggest that all components of RBT04262 formed as intrusions. As the majority of Martian meteorites also have a cumulate origin, it is speculated here that crust formation on Mars may be dominated by magmatic underplating or intrusion rather than by subaerial flows. An intrusive-origin for Martian crust has important implications as intrusions can reset the radiometric ages or magnetic signatures of the Martian crust without erasing the cratering history.
dc.format.mimetype application/pdf
dc.language.iso eng
dc.subjectGeology
Planetology
dc.title Meteorite evidence for deep crustal magma chambers on Mars suggests crustal growth driven by underplating and intrusion
dc.type.genre Thesis
dc.type.material Text
thesis.degree.department Earth Science
thesis.degree.discipline Natural Sciences
thesis.degree.grantor Rice University
thesis.degree.level Masters
thesis.degree.name Master of Science
dc.identifier.citation Dalton, Heather Anne. "Meteorite evidence for deep crustal magma chambers on Mars suggests crustal growth driven by underplating and intrusion." (2010) Master’s Thesis, Rice University. https://hdl.handle.net/1911/62206.


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