Magmatic inclusions and felsic clasts in the Dar al Gani 319 polymict ureilite

Abstract— Magmatic inclusions occur in type II ureilite clasts (olivine‐orthopyroxene‐augite assemblages with essentially no carbon) and in a large isolated plagioclase clast in the Dar al Gani (DaG) 319 polymict ureilite. Type I ureilite clasts (olivine‐pigeonite assemblages with carbon), as well as other lithic and mineral clasts in this meteorite, are described in Ikeda et al.(2000). The magmatic inclusions in the type II ureilite clasts consist mainly of magnesian augite and glass. They metastably crystallized euhedral pyroxenes, resulting in feldspar component‐enriched glass. On the other hand, the magmatic inclusions in the large plagioclase clast consist mainly of pyroxene and plagioclase, with a mesostasis. They crystallized with a composition along the cotectic line between the pyroxene and plagioclase liquidus fields.

[1]  C. Goodrich,et al.  Primary trapped melt inclusions in olivine in the olivine-augite-orthopyroxene ureilite Hughes 009 , 2001 .

[2]  M. Prinz,et al.  Lithic and mineral clasts in the Dar Al Gani (DAG) 319 polymict ureilite , 2000 .

[3]  C. Goodrich,et al.  Primary melt inclusions in olivine, augite and orthopyroxene in ureilite FRO 90054 , 2000 .

[4]  C. Goodrich,et al.  The parent magmas of ureilites FRO 90054 and Hughes 009: Inferences from melt inclusions in FRO 90054 , 2000 .

[5]  C. Goodrich,et al.  Primary trapped melt inclusions in olivine in a ureilite - I. Description , 1999 .

[6]  C. Goodrich.  Are ureilites residues from partial melting of chondritic material? The answer from MAGPOX , 1999 .

[7]  J. Zipfel,et al.  Primary trapped melt inclusions in olivine in a ureilite - II. Reconstruction of liquid composition and implications , 1999 .

[8]  C. Goodrich.  A ureilite (Hughes 009) with an unusual shock texture: Implications for the origin of metal in ureilites? , 1998 .

[9]  G. Molin,et al.  Transmission electron microscope texture and crystal chemistry of coexisting ortho‐ and clinopyroxene in the Antarctic ureilite Frontier Mountain 90054: Implications for thermal history , 1997 .

[10]  C. Pillinger,et al.  Euromet Ureilite Consortium: A preliminary report on carbon and nitrogen geochemistry , 1993 .

[11]  C. Goodrich.  Ureilites - A critical review , 1992 .

[12]  J. Longhi,et al.  The parent magmas of the SNC meteorites. , 1989 .

[13]  N. Grevesse,et al.  Abundances of the elements: Meteoritic and solar , 1989 .

[14]  R. Clayton,et al.  Formation of ureilites by nebular processes , 1988 .

[15]  Y. Ikeda.  Petrology of Allan Hills-764 Chondrites (LL3) , 1980 .

[16]  K. Keil,et al.  The nature and origin of ureilites , 1980 .