The Semarkona meteorite - First recorded occurrence of smectite in an ordinary chondrite, and its implications

Details The Semarkona meteorite - First recorded occurrence of smectite in an ordinary chondrite, and its implications The Semarkona meteorite - First recorded occurrence of smectite in an ordinary chondrite, and its implications

Jul 1987

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987gecoa..51.1875h&link_type=abstract

Geochimica et Cosmochimica Acta (ISSN 0016-7037), vol. 51, July 1987, p. 1875-1882.

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45

Chondrites, Meteoritic Composition, Petrology, Calcium, Iron, Metamorphic Rocks, Meteorites, Semarkona, Smectite, Ordinary Chondrites, Stony Meteorites, Ll3 Chondrites, Description, Alteration, Samples, Meteorite, Matrix, Calcium, Iron, Petrology, Classification, Metamorphism, Texture, Photomicrographs, Laboratory Studies, Chondrules, Clasts, Composition, Mineralogy, Chemistry, Origin, Formation, Hydrothermal Processes

Scientific paper

Semarkona is an unshocked unequilibrated ordinary chondrite. Much of the interchondrule matrix and the mesostases of some chondrules and clasts have been hydrothermally altered. Analyses of altered materials and opaque matrix are presented. Ca and Fe have been redistributed from primary, anhydrous phases into calcite and Na, Fe smectite, respectively. In Semarkona the process possibly requires open system behavior inconsistent with the conventional view of 'metamorphism' of the ordinary chondrites. The low petrologic type previously assigned to Semarkona is the result of retrograde metamorphism, under aqueous conditions, of a higher temperature mineral assemblage. Semarkona, and possibly Bishunpur, should be assigned to petrologic type 2.

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