The Classificational Wanderings of the Ningqiang Chondrite

Details The Classificational Wanderings of the Ningqiang Chondrite The Classificational Wanderings of the Ningqiang Chondrite

Mar 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996lpi....27..635k&link_type=abstract

Lunar and Planetary Science, volume 27, page 635

Computer Science

8

Chondrites, Classifications, Composition

Scientific paper

The Ningqiang chondrite, which fell in China in 1983, was initially classified as a CV3 chondrite. Citing important petrographic and compositional differences between Ningqiang and typical CV chondrites, Rubin et al reclassified Ningqiang as an anomalous member of the CV group (CV3-an). Among the differences were a lower refractory inclusion abundance and lower refractory lithophile abundances in Ningqiang. Clayton and Mayeda implied a possible Ningqiang relationship with CO3 chondrites based on their O-isotope analyses. Kallemeyn et al included Ningqiang with the new CK group because its petrographic properties appeared to be closer to those of the CK group than to the CV group. But they listed it as CK3-an due to distinct compositional differences between Ningqiang and typical CK chondrites. More recently, Guimon et al suggested that Ningqiang is better classified as a member of the CV group because its induced TL falls in a range similar to the CV group and unlike normal CK chondrites which have no detectable induced TL. In an attempt to better understand its compositional classification a complete 'classical' bulk analysis of Ningqiang, was performed to complement previous INAA analyses and are discussed here. Analyses were also performed on Allende (CV3) and the only CK fall, Karoonda (CK4) for comparison. The new Ningqiang data only add to the confusion and support the conclusion that it does not fit well into any of the established chondrite groups.

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