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  • LUNAR AND PLANETARY EXPLORATION  (6)
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  • 1
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    Experimental study of chemical, phase and textural equilibrium of high TiO2 mare basalts and peridotite (1994)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The topics covered include the following: (1) basalt petrogenesis; (2) petrogenesis of highly evolved magmas; and (3) chondrites.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: NASA-CR-196480 , NAS 1.26:196480
    Format: application/pdf
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  • 2
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    Diapirism and the origin of high TiO2 mare glasses (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: High TiO2 mare picritic glasses are derived from cumulate source regions that are only modestly endowed with ilmenite-enriched crystallization products. These sources are mobilized by the heat derived from the primitive interior and evolve into diapirs which rise adiabatically from depths in excess of 700 km. As these diapirs undergo pressure-release melting, they also stir in significant portions of the surrounding mantle.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geophysical Research Letters (ISSN 0094-8276); 18; 2069-207
    Format: text
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  • 3
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    Intensive parameters of enstatite chondrite metamorphism (1989)
    In:  Other Sources
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    Publication Date: 2019-07-12
    Description: A geothermometer based on the assemblage kamacite-quartz-enstatite-oldhamite-troilite found in enstatite chondrites is described. Data obtained with the geothermometer reveal that the EL6 meteorites experienced temperatures exceeding 1000 C. These temperatures imply a metal-sulfide melting event that may have fractionated the melt from the source region.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 53; 2735-274
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  • 4
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    Chassigny petrogenesis - Melt compositions, intensive parameters, and water contents of Martian (?) magmas (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: This paper considers petrogenesis of SNC meteorites by examining partially crystallized melt inclusions in cumulus olivine grains in Chassigny meteorite. First, all phases in the Chassigny inclusions were analyzed by electron microprobe, followed by an experimental investigation of the kaersutite/melt equilibria. Results yield the intensive parameters which stabilize igneous kaersutite and the melt compositions that coexist with kaersutite. The results are used to model Chassigny petrogenesis. It is argued that the existence in the Chassigny of hydrous melts and the conditions appropriate for amphibole crystallization suggest the existence on the Chassigny parent body (Mars) of SiO2-rich lavas.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 55; 349-366
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  • 5
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    Petrogenesis of lunar troctolites (1994)
    In:  Other Sources
    Details
    Publication Date: 2019-08-27
    Description: Models of petrogenesis for lunar troctolites are severely constrained by the high Mg(*) (greater than 88) values of the most primitive members of the Mg-rich suite. Melts derived by partial melting of olivine cumulates to the lunar magma ocean have high Mg(*) but are strongly undersaturated with respect to plagioclase. Assimilation of lunar crust cannot bring these melts to the plagioclase liquious without unduly reducing the Mg(*) values of olivine. Partial melts derived by melting a lherzolite primitive interior have higher normative plagioclase contents but require sources with Mg(*) greater than 90. More terrestrial-like Mg(*) (approximately 88) values are permitted if rising thermal plumes are capable of entraining the most Mg-rich cumulates of the magma ocean. The Mg(*) values of lunar troctolites may, therfore, reflect a hybrid source composed of primitive mantle and Mr-rich cumulates of the magma ocean. Higher Mg(*) values may also arise from the reducction of small amounts of FeO to Fe. Alternatively, the parent magmas to lunar troctolites may be impact melts of the anorthositic crust and the Mg-rich dunites cumulates of the magma ocean; the latter were brought to the upper mantle during the overturn of the unstable cumulate pile of the magma ocean.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Journal of Geophysical Research (ISSN 0148-0227); 99; E9; p. 19,083-19,093
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  • 6
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    Derivation of primary magmas and melting of crustal materials on Venus - Some preliminary petrogenetic considerations (1990)
    In:  Other Sources
    Details
    Publication Date: 2019-07-12
    Description: As an aid to understanding crustal formation and evolution processes on Venus, a general paradigm is developed for the derivation of primary magmas, and the range of possibilities of conditions for remelting of crustal materials and the evolution of the products of remelting. The present knowledge of the bulk and surface composition is used as a basis. A wide range of magma types is possible for the range of conditions of derivation of primary magmas and crustal remelting and no magma type can be arbitrarily excluded from consideration on Venus. The composition of Venus and the nature of source materials for melting, the melting of mantle material peridotites, and the melting of basalts including tholeiites and modified basalts are discussed. Magmatic differentiation is considered, and a comparison to terrestrial magmatic environments is conducted. It is concluded the magnetic and volcanic activity on Venus could be very similar to that on the earth, although eruption styles are expected to vary due to environmental conditions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth, Moon, and Planets (ISSN 0167-9295); 50-51; 57-80
    Format: text
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