Discovery, Mineral Paragenesis and Origin of Wadalite in Meteorites

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The mineral wadalite (ideal and simplified formula: Ca{sub 6}Al{sub 5}Si{sub 2}O{sub 16}Cl{sub 3}) has been discovered for the first time in a meteorite, specifically in the coarse-grained, igneous Type B calcium-aluminum-rich inclusions (CAIs) from the CV carbonaceous chondrite Allende. We report the results of electron microprobe, scanning electron microscopy and transmission electron microscopy analyses of wadalite-bearing assemblages in the Allende CAIs and propose that wadalite formed by metamorphic reaction between akermanitic melilite and anorthite, likely mediated by chlorine-bearing fluids. Petrographic relationships support the likelihood of multistage alterations by fluids of different chemistries interspersed or coinciding with thermal metamorphic episodes on ... continued below

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Ishii, H A; Krot, A N; Bradley, J P; Keil, K; Nagashima, K; Teslich, N et al. July 9, 2009.

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The mineral wadalite (ideal and simplified formula: Ca{sub 6}Al{sub 5}Si{sub 2}O{sub 16}Cl{sub 3}) has been discovered for the first time in a meteorite, specifically in the coarse-grained, igneous Type B calcium-aluminum-rich inclusions (CAIs) from the CV carbonaceous chondrite Allende. We report the results of electron microprobe, scanning electron microscopy and transmission electron microscopy analyses of wadalite-bearing assemblages in the Allende CAIs and propose that wadalite formed by metamorphic reaction between akermanitic melilite and anorthite, likely mediated by chlorine-bearing fluids. Petrographic relationships support the likelihood of multistage alterations by fluids of different chemistries interspersed or coinciding with thermal metamorphic episodes on the Allende parent asteroid. Fluid involvement in metamorphism of Allende CAIs implies that these objects experienced open-system alteration after accretion into the CV chondrite parent asteroid which may have resulted in disturbances of their oxygen- and magnesium-isotope systematics.

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PDF-file: 39 pages; size: 1.3 Mbytes

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  • Journal Name: American Mineralogist, vol. 95, N/A, April 1, 2010, pp. 440-448; Journal Volume: 95

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  • Report No.: LLNL-JRNL-414649
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 974863
  • Archival Resource Key: ark:/67531/metadc932905

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  • July 9, 2009

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  • Nov. 13, 2016, 7:26 p.m.

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  • Nov. 23, 2016, 4:01 p.m.

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Ishii, H A; Krot, A N; Bradley, J P; Keil, K; Nagashima, K; Teslich, N et al. Discovery, Mineral Paragenesis and Origin of Wadalite in Meteorites, article, July 9, 2009; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc932905/: accessed October 19, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.