A planetary, H-group pebble in the Barwell, L6, unshocked chondritic meteorite

A planetary, H-group pebble in the Barwell, L6, unshocked chondritic meteorite

One stone of the Barwell (L6) shower contains an igneous inclusion with the oxygen isotopic signature of H-group chondrites. The inclusion is composed dominantly of olivine with a composition, Fo 75.5, identical with that of its host; other phases are only partially equilibrated with the host. The i...

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Veröffentlicht in:Earth and planetary science letters 1988-10, Vol.90 (2), p.105-118
Hauptverfasser: Hutchison, R., Williams, C.T., Din, V.K., Clayton, R.N., Kirschbaum, C., Paul, R.L., Lipschutz, M.E.
Format: Artikel
Sprache:eng
Schlagworte:
Cosmochemistry. Extraterrestrial geology
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochronology
Isotope geochemistry. Geochronology
Meteorites. Tectites. Impactites
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container_end_page 118
container_issue 2
container_start_page 105
container_title Earth and planetary science letters
container_volume 90
creator Hutchison, R.
Williams, C.T.
Din, V.K.
Clayton, R.N.
Kirschbaum, C.
Paul, R.L.
Lipschutz, M.E.
description One stone of the Barwell (L6) shower contains an igneous inclusion with the oxygen isotopic signature of H-group chondrites. The inclusion is composed dominantly of olivine with a composition, Fo 75.5, identical with that of its host; other phases are only partially equilibrated with the host. The inclusion has a fractionated rare earth element pattern showing depletion in the heavy rare earth elements and a positive Eu anomaly; it is depleted in siderophile elements. Inclusion and host have Ar Ar ages (4.44 and 4.51 Ga, respectively) and 129Xe r/I ratios identical within experimental error. We conclude that melting occurred very early on an H-group chondritic body. Two objects from a single meteorite have different oxygen isotopic ratios but identical 129Xe r/ 127I ratios, which may indicate that the I Xe systematics reflect chronological differences in closure to Xe rather than isotopically heterogeneous iodine. The inclusion and its host cooled to Xe closure temperature contemporaneously with chondrules from unequilibrated ordinary chondrites.
doi_str_mv 10.1016/0012-821X(88)90094-5
format Article
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source Elsevier ScienceDirect Journals
subjects Cosmochemistry. Extraterrestrial geology
Earth sciences
Earth, ocean, space
Exact sciences and technology
Geochronology
Isotope geochemistry. Geochronology
Meteorites. Tectites. Impactites
title A planetary, H-group pebble in the Barwell, L6, unshocked chondritic meteorite
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