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Item Information   Holdings     Discover more across the Smithsonian     Mason, Brian     Allende meteorite     Taylor, Stuart Ross,     Smithsonian Institution       MARC Display

Inclusions in the Allende Meteorite / / Brian Mason and S.R. Taylor.   Author:  Mason, Brian (Brian Harold), 1917-2009 Title:  Inclusions in the Allende Meteorite / / Brian Mason and S.R. Taylor. Publisher:  Washington : Smithsonian Institution, 1982. Description:  iii, 30 p. : ill. ; 26 cm. Electronic Version:  Online Publication  http://dx.doi.org/10.5479/si.00810274.25.1 Series:  Smithsonian contributions to the earth sciences ; -- no. 25 Abstract:  Six discrete groups of inclusions have been distinguished in the Allende meteorite. Groups I, V, and VI are mostly melilite-rich chondrules, although some have been extensively altered to fine-grained aggregates; Groups II and III are mostly fine-grained aggregates made up largely of spinel and fassaite; Group IV are olivine-rich aggregates and chondrules. Each group has a distinctive trace-element pattern, most clearly shown by the rare-earth (RE) distribution pattern. Group I has an unfractionated pattern (except for a small positive Eu anomaly) at about 10-15 times chondrites; Group II has a highly fractionated pattern with depletion of the heavier lanthanides (Gd-Er) and negative Eu and positive Tm and Yb anomalies; Group III has an unfractionated pattern at about 20 times chondrites, except for negative Eu and Yb anomalies; Group IV has a relatively unfractionated pattern at 2-4 times chondrites; Group V has an unfractionated pattern at 10-20 times chondrites; Group VI has an unfractionated pattern at 10-20 times chondrites, except for positive Eu and Yb anomalies (i.e., complementary to Group III). The complex patterns of trace element distribution in these Allende inclusions indicate a complex history of formation of this meteorite from the solar nebula. Notes:  Also available electronically as a PDF file or files (requires Adobe Acrobat Reader). Bibliography Note:  Bibliography: p. 28-30. Local Note:  Elecresource Subject:  Allende meteorite Added Author:  Taylor, Stuart Ross, 1925- Smithsonian Institution Added Series:  Smithsonian contributions to the earth sciences. no. 25. Catalog Source No.:  (OCoLC)ocm08347641 SuDoc number:  SI 1.26:25 Copy/Holding information Call No. Collection Barcode Status     Electronic Resources elec358006 Checked In Request Copy Add Copy to MyList QB756 .A43 1982 Minerals 39088011559093 Checked In Request Copy Add Copy to MyList QE1 .S66 no.25 Museum Studies Research Library Smithsoniana (non-circulating) mq545113 Checked In Request Copy Add Copy to MyList Format: HTMLPlain textDelimited Subject:   Email to:

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