Precursors of Type C inclusions - Evidences from the new kind of anorthite-spinel-rich inclusions in the Ningqiang carbonaceous chondrite

Details Precursors of Type C inclusions - Evidences from the new kind of anorthite-spinel-rich inclusions in the Ningqiang carbonaceous chondrite Precursors of Type C inclusions - Evidences from the new kind of anorthite-spinel-rich inclusions in the Ningqiang carbonaceous chondrite

Mar 1997

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1997lpi....28..815l&link_type=abstract

Conference Paper, 28th Annual Lunar and Planetary Science Conference, p. 815.

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2

Inclusions, Anorthosite, Spinel, Carbonaceous Chondrites, Pyroxenes, Chemical Composition

Scientific paper

Type C (plagioclase-Ca-pyroxene-rich) is one of common Ca-Al-rich inclusions in CV3 chondrites, and likely crystallized from melts. In the Ningqiang meteorite, an anomalous carbonaceous chondrite, we reported a new kind of anorthite-spinel inclusions (ASIs), and a Type C inclusion. One of the ASIs is a fluffy assemblage of numerous small concentric grains consisting of spinel, anorthite and Ca-pyroxene. It also contains many large spinel-nodules rimmed by melilite and/or anorthite and Ca-pyroxene in the center, and is covered by a melilite-spinel-crust. The other ASIs are the same as the fluffy one, except for a compact texture with well defined spinel-nodule core. Petrography and mineralogy suggest that the ASIs were not molten. The Type C inclusion consists mainly of anorthite, fassaite and spinel with minor feldspathoids, hedenbergite and melilite, and shows subophitic texture. We show close genetic relationships between Type A, ASI and Type C inclusions.

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