Evolution and classification of acapulcoites and lodranites from a chemical point of view

Andrea Patzer, Dolores H. Hill, William V. Boynton

Research output: Contribution to journalArticle

40 Citations (Scopus)

Abstract

We examined 15 bulk samples of the acapulcoite-lodranite clan for their major, minor, and trace element concentrations using INAA techniques. Among the analyzed meteorites are 2 new acapulcoites (Dhofar [Dho] 290, Thiel Mountains [TIL] 99002) as well as an additional acapulcoite that has been described previously only in very brief form (Graves Nunataks [GRA] 98028). The petrographic attributes of these 3 samples are addressed thoroughly. We also include petrographic information on 2 acapulcoites from Africa: Northwest Africa (NWA) 725 and NWA 1058. In general, our study strongly supports the widely accepted idea that acapulcoites and lodranites evolved through partial melting and melt migration of metal/sulfide phases and plagioclase. Furthermore, we concur with previous researchers that the original bimodal classification scheme for acapulcoites and lodranites proves to be too simple. Based on our data set, we introduce an alternative, extended scheme. With respect to their elemental distribution patterns, we distinguish 5 subtypes comprising primitive, typical, transitional, and enriched acapulcoites on one hand and lodranites on the other. The chemical distinction between the primitive, typical, and transitional acapulcoites is rather subtle and gradual. It stands in contrast to the clear modifications observed for the signatures of the enriched acapulcoites and the lodranites. The definition of subcategories basically reflects the concentrations of 2 key elements: K and Se. We note, however, that the assignment of subgroups may not be exclusively inferred from elemental abundances but should also consider additional petrographic information.

Original languageEnglish (US)
Pages (from-to)61-85
Number of pages25
JournalMeteoritics and Planetary Science
Volume39
Issue number1
StatePublished - Jan 2004

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acapulcoite
nunataks
distribution (property)
meteorites
plagioclase
subgroups
trace elements
mountains
meteorite
partial melting
sulfides
sulfide
signatures
melting
trace element
melt
mountain
metal
metals
chemical

ASJC Scopus subject areas

  • Geophysics

Cite this

Evolution and classification of acapulcoites and lodranites from a chemical point of view. / Patzer, Andrea; Hill, Dolores H.; Boynton, William V.

In: Meteoritics and Planetary Science, Vol. 39, No. 1, 01.2004, p. 61-85.

Research output: Contribution to journalArticle

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