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  • Geophysics  (2)
  • Geosciences (General)  (1)
  • Lunar and Planetary Science and Exploration; Space Sciences (General)  (1)
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  • 1
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    Petrology of Amoeboid Olivine Aggregates in Antarctic CR Chondrites: Comparison With Other Carbonaceous Chondrites (2016)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Amoeboid olivine aggregates (AOAs) are important refractory components of carbonaceous chondrites and have been interpreted to represent solar nebular condensates that experienced high-temperature annealing, but largely escaped melting. In addition, because AOAs in primitive chondrites are composed of fine-grained minerals (forsterite, anorthite, spinel) that are easily modified during post crystallization alteration, the mineralogy of AOAs can be used as a sensitive indicator of metamorphic or alteration processes. AOAs in CR chondrites are particularly important because they show little evidence for secondary alteration. In addition, some CR AOAs contain Mn-enriched forsterite (aka low-iron, Mn-enriched or LIME olivine), which is an indicator of nebular formation conditions. Here we report preliminary results of the mineralogy and petrology of AOAs in Antarctic CR chondrites, and compare them to those in other carbonaceous chondrites.
    Keywords: Geophysics
    Type: JSC-CN-35134 , Lunar and Planetary Science Conference; Mar 21, 2016 - Mar 25, 2016; The Woodlands, TX; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Petrology of Amoeboid Olivine Aggregates in Antarctic CR Chondrites: Evidence for Aqueous Alteration and Shock Metamorphism (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: CR chondrites are the group of carbonaceous chondrites that preserve records of formation of their components in the solar nebula. Although they are affected by aqueous alteration, many chondrules and CAIs are well-preserved, suggesting they have experienced little thermal metamorphism. We have been investigating the petrologic variations among the CR chondrites in Japanese-NIPR Antarctic meteorite collection. Especially we focused on the petrology of amoeboid olivine aggregates (AOAs) in order to understand secondary alteration on CR chondrite parent body. AOAs are composed of fine-grained forsteritic olivine and refractory minerals formed by condensation from solar nebula, and can be used as sensitive indicators of secondary alteration processes.
    Keywords: Geosciences (General)
    Type: JSC-CN-40532 , Symposium on Antarctic Meteorites; Dec 05, 2017 - Dec 08, 2017; Tokyo; Japan
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Aqueous Alteration and Shock Metamorphism of Antarctic CR Chondrites (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: CR chondrites are the group of carbonaceous chondrites that best preserve records of formation of their components in the solar nebula. Although they are affected by aqueous alteration, many chondrules and CAIs are well-preserved, suggesting they have experienced little thermal metamorphism. We have been investigating the petrologic variations among the CR chondrites in the NIPR Antarctic meteorite collection. We focused particular attention on the petrology of amoeboid olivine aggregates (AOAs) in order to understand secondary alteration on the CR chondrite parent body. AOAs are composed of fine-grained forsteritic olivine and refractory minerals formed by condensation in the solar nebula, and can be used as sensitive indicators of secondary alteration processes.
    Keywords: Lunar and Planetary Science and Exploration; Space Sciences (General)
    Type: JSC-E-DAA-TN52322 , PERC International Symposium on Dust & Parent Bodies (IDP2018); Feb 26, 2018 - Feb 28, 2018; Chiba; Japan
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 4
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    Amoeboid Olivine Aggregates in Antarctic CR Chondrites: Petrologic Variations Among CR Chondrites (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Amoeboid olivine aggregates (AOAs) are important components of carbonaceous chondrites that are interpreted as solar nebula condensates, and can be used as sensitive indicators of metamorphic or alteration processes. We have been investigating a set of Antarctic CR chondrites from the Japanese-NIPR collection in order to study variations within the CRs in general and their AOAs in particular. Main goals are to identify variations in conditions of nebular condensation, parent body effects and terrestrial weathering.
    Keywords: Geophysics
    Type: JSC-CN-39694 , Annual Meeting of the Meteoritical Society; Jul 23, 2017 - Jul 28, 2017; Santa Fe, NM; United States
    Format: application/pdf
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    NASA TECHNICAL REPORTS
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