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  • Lunar and Planetary Science and Exploration  (3)
  • Geosciences (General)  (1)
  • Lunar and Planetary Science and Exploration; Space Sciences (General)  (1)
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  • 1
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    Petrology of Two Itokawa Particles: Comparison with Equilibrated LL Chondrites (2015)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: A strong link between Itokawa particles and LL chondrites was confirmed by preliminary examinations of Hayabusa particles [e.g., 1, 2]. Both poorly equilibrated and highly equilibrated particles have been found among the grains returned from Itokawa [1], and it is suggested that they correspond to LL4 and LL5-6, respectively. Here we report the petrography of two Itokawa particles and TEM study of one, and compare them to Antarctic LL chondrites with variable petrologic types (LL4-LL7) in order to understand the metamorphic history of asteroid Itokawa.
    Keywords: Lunar and Planetary Science and Exploration
    Type: JSC-CN-32757 , Lunar and Planetary Science Conference; Mar 16, 2015 - Mar 20, 2015; The Woodlands, TX; United States
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  • 2
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    Trace-Element Concentrations in Northwest Africa 032 (2001)
    In:  Other Sources
    Details
    Publication Date: 2019-07-17
    Description: Trace-element concentrations (INAA) are presented for four samples of the NWA 032 lunar meteorite. The mare basalt has a moderately high Th concentration (1.9 ppm) and a higher Th/REE ratio than any other known mare basalt. Additional information is contained in the original extended abstract.
    Keywords: Lunar and Planetary Science and Exploration
    Type: Lunar and Planetary Science XXXII; LPI-Contrib-1080
    Format: text
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  • 3
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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
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  • 4
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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
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  • 5
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    Ultra-Refractory Calcium-Aluminum-Rich Inclusion in an AOA in CR Chondrite Yamato-793261 (2017)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: CR chondrites are a group of primitive carbonaceous chondrites that preserve nebular records of the formation conditions of their components. We have been investigating a set of Antarctic CR chondrites from the Japanese-NIPR collection in order to study variations within this group. During our study, we have found an AOA that encloses an ultrarefractory (UR) CAI in Yamato-793261 (Y-793261). UR CAIs are rare in carbonaceous chondrites, and only three UR CAIs in AOAs have been identified so far. UR CAIs can provide information on crystallization processes at very high temperatures in the solar nebula. Here we describe the petrology of Y-793261, and preliminary results on this newly discovered AOA enclosing a UR CAI.
    Keywords: Lunar and Planetary Science and Exploration
    Type: JSC-CN-38554 , Lunar and Planetary Science Conference; Mar 20, 2017 - Mar 24, 2017; The Woodlands, TX; United States
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