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I-129/I-127 variations among enstatite chondrites (1988)

Hohenberg, C. M. ; Hudson, B. ; Podosek, F. A. ; [et al.]

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Publication Date: 2019-07-12

Description: The iodine isotopic compositions and corresponding I-Xe ages were obtained for eight enstatite chondrites, bringing the total number of enstatite chondrites examined by the I-Xe technique to 11. Iodine isotopic compositions of these 11 chondrites indicate a well-defined hiatus correlated with the hiatus in chemical composition defining the two distinct enstatite groups: EH(4,5) and EL(6). Judging by the I-129/I-127 ratios and assuming that both the EH and EL groups originated from a reservoir with a uniform initial iodine isotopic composition, the EH(4,5) chondrites were estimated to be about 4 mln older than the El chondrites.

Keywords: LUNAR AND PLANETARY EXPLORATION

Type: Geochimica et Cosmochimica Acta (ISSN 0016-7037); 52; 101-111

Format: text

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