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  • Other Sources  (4)
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  • 1
    facet.materialart.
    Unknown
    Brazilian stone meteorites (1980)
    In:  Other Sources
    Details
    Publication Date: 2019-06-28
    Description: A survey of Brazilian meteorites is presented, along with basic premises of meteoritics, including classification, naming, and analytic procedures. Meteorites are noted to be of interest as representative samples of ancient rocks, perhaps half as old as the universe, as sometimes originating from outside the solar system, containing early solar material, and containing evidence of cosmic ray interactions or collisions. The characteristics which make up the achondrite and chondrite group are reviewed, and a listing of the primary characteristics of known Brazilian meteorites is provided.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Unknown
    Studies of Brazilian meteorites. III - Origin and history of the Angra dos Reis achondrite (1977)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The mineral composition of the Angra dos Reis meteorite, which fell in 1869, is described. This achondrite contains phases reported in a meteorite for the first time. Petrofabric analysis shows that fassaite has a preferred orientation and lineation, which is interpreted as being due to cumulus processes, possibly the effect of post-depositional magmatic current flow or laminar flow of a crystalline mush. The mineral chemistry indicates crystallization from a highly silica-undersaturated melt at low pressure. Several aspects of the mineral composition are discussed with reference to the implications of crystallization conditions.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Earth and Planetary Science Letters; 35; 2, Ju; June 197
    Format: text
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    NASA TECHNICAL REPORTS
  • 3
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    Unknown
    Studies of Brazilian meteorites. XIV - Mineralogy, petrology, and chemistry of the Conquista, Minas Gerais, chondrite (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Conquista chondrite is described and classified as an H4. The mineral composition is reported. H-group classification is based on described microscopic, electron microprobe, and bulk chemical studies. The evidence for petrologic type 4 classification includes the pronounced well-developed chondritic texture; the slight compositional variations in constituent phases; the high Ca contents of pyroxene and the presence of pigeonite; glassy to microcrystalline interstitial material rich in alkalis and SiO2; and twinned low-Ca clinopyroxene.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics; 13; June 30
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    Unknown
    Studies of Brazilian meteorites. XIII - Mineralogy, petrology, and chemistry of the Putinga, Rio Grande do Sul, chondrite (1978)
    In:  Other Sources
    Details
    Publication Date: 2019-06-27
    Description: The Putinga, Rio Grande do Sul chondrite is described and classified as an L6. The mineral composition and some significant ratios of elements are reported, and the reasons for assignment to the L group and to petrologic type 6 are explained. The analysis suggests that maskelynite of oligoclase composition was formed by solid-state shock transformation of previously existing well-crystallized plagioclase at estimated shock pressures of about 250-350 kbar. This finding indicates that recrystallization (formation of well-crystallized oligoclase) preceded shock transformation formation of the maskelynite.
    Keywords: LUNAR AND PLANETARY EXPLORATION
    Type: Meteoritics; 13; June 30
    Format: text
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    NASA TECHNICAL REPORTS
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