Density, porosity, and magnetic susceptibility of carbonaceous chondrites

    Authors

    R. J. Macke; G. J. Consolmagno;D. T. Britt

    Comments

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    Abbreviated Journal Title

    Meteorit. Planet. Sci.

    Keywords

    COMPOSITIONAL CLASSIFICATION; CV3 CHONDRITES; METEORITES; ABUNDANCES; PETROLOGY; SOLAR; Geochemistry & Geophysics

    Abstract

    We report physical properties (bulk and grain density, magnetic susceptibility, and porosity) measured using nondestructive and noncontaminating methods for 195 stones from 63 carbonaceous chondrites. Grain densities over the whole population average 3.44 g cm-3, ranging from 2.42 g cm-3 (CI1 Orgueil) to 5.66 g cm-3 (CB Bencubbin). Magnetic susceptibilities (in log units of 10-9 m3 kg-1) averaged log ? = 4.22, ranging from 3.23 (CV3 Axtell) to 5.79 (CB Bencubbin). Porosities averaged 17%, ranging from 0 (for a number of meteorites) to 41% (for one stone of the CO Ornans). Notably, we found significant differences in porosity between the oxidized and reduced CV subgroups, with the porosities of CVo averaging approximately 20% and CVr porosities approximately 4%. Overall, porosities of carbonaceous chondrite falls trend with petrographic type, from type 1 (CI) near 35%, type 2 (CM, CR) averaging 23%, type 3 (CV, CO) 21%, to type 4 (CK and some CO) averaging 15%. There is also a significant decrease in porosity between meteorites of shock stage S1 and those of S2, indicative of shock compression.

    Journal Title

    Meteoritics & Planetary Science

    Volume

    46

    Issue/Number

    12

    Publication Date

    1-1-2011

    Document Type

    Article

    Language

    English

    First Page

    1842

    Last Page

    1862

    WOS Identifier

    WOS:000298094600005

    ISSN

    1086-9379

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