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The Ningqiang Meteorite: Classification and Petrology of an Anomalous CV Chondrite
Author(s) -
Rubin Alan E.,
Wang Daode,
Kallemeyn Gregory W.,
Wasson John T.
Publication year - 1988
Publication title -
meteoritics
Language(s) - English
Resource type - Journals
eISSN - 1945-5100
pISSN - 0026-1114
DOI - 10.1111/j.1945-5100.1988.tb00891.x
Subject(s) - chondrule , chondrite , porphyritic , carbonaceous chondrite , meteorite , geology , formation and evolution of the solar system , refractory (planetary science) , geochemistry , olivine , asteroid , mineralogy , astrobiology , physics , paleontology , quartz
— Ningqiang is an anomalous CV chondrite (oxidized subgroup) containing a high abundance of aggregational inclusions (13.7 vol.%) and low abundances of refractory inclusions (1.0 +1.0 –0.5 vol.%) and bulk refractory lithophiles (∼0.82 × CV). Ningqiang may have agglomerated after most refractory inclusions at the nebular midplane had already been incorporated into other objects. Coarse‐grained rims surround only ∼5% of Ningqiang chondrules, compared to ∼50% in normal CV chondrites. Aggregational inclusions appear to have formed by incipient melting of fine‐grained aggregates at relatively low temperatures in the solar nebula, possibly by the mechanism responsible for chondrule formation. Granoblastic porphyritic chondrules, which contain olivines forming 120° triple junctures and no mesostasis, probably formed in the solar nebula by incomplete melting of precursor materials that were olivine normative and had relatively low concentrations of Si, Ca, Al, Fe and Na.