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    Meteorite evidence for deep crustal magma chambers on Mars suggests crustal growth driven by underplating and intrusion

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    Author
    Dalton, Heather Anne
    Date
    2010
    Degree
    Master of Science
    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.
    Keyword
    Geology; Planetology
    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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    • Rice University Electronic Theses and Dissertations [14030]

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    Home | FAQ | Contact Us | Privacy Notice | Accessibility Statement
    Managed by the Digital Scholarship Services at Fondren Library, Rice University
    Physical Address: 6100 Main Street, Houston, Texas 77005
    Mailing Address: MS-44, P.O.BOX 1892, Houston, Texas 77251-1892
    Site Map