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Carbon Isotopic Heterogeneity of Graphite in the San Juan Mass of the Campo Del Cielo IAB Iron MeteoriteThe origin of IAB iron meteorites is still a matter of debate. It is generally believed that iron meteorites originated from molten cores in small planetesimals because the fractionation trend of trace elements (e.g., Ir, Ge, Ga, etc. vs. Ni) for most iron meteorites can be more or less explained by fractional crystallization from metal melts. However, this process cannot produce trace element characteristics of the IAB (and other) iron meteorites. To explain these trace element abundance patterns, several models have been proposed. Although most of these models require a high temperature, clear evidence has recently been obtained for a sub-solidus formation of IAB iron meteorites from noble gas analyses. Moreover, heterogeneous distributions of some trace elements in metal and other phases also suggest a low temperature origin of at least some IAB iron meteorites. Here we use the carbon isotopic compositions of graphite to constrain the origin of IAB iron meteorites. Our data confirm a possible low temperature origin of IAB iron meteorites.
Document ID
Acquisition Source
Document Type
Conference Paper
Maruoka, T.
(Washington Univ. Saint Louis, MO, United States)
Kurat, G.
(Naturhistorisches Museum Vienna, Austria)
Zinner, E.
(Washington Univ. Saint Louis, MO, United States)
Varela, M. E.
(Consejo Nacional de Investigaciones Cientificas y Tecnicas Argentina)
Ametrano, S. J.
(Museo de La Plata La Plata, Argentina)
Date Acquired
August 21, 2013
Publication Date
January 1, 2003
Publication Information
Publication: Lunar and Planetary Science XXXIV
Subject Category
Lunar And Planetary Science And Exploration
Funding Number(s)
Distribution Limits
Public Use Permitted.
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