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dc.contributor.authorFarsang, Stefan
dc.contributor.authorFranchi, Ian A.
dc.contributor.authorZhao, Xuchao
dc.contributor.authorRaub, Timothy D.
dc.contributor.authorRedfern, Simon A.T.
dc.contributor.authorGrady, Monica M.
dc.contributor.authorZolensky, Michael
dc.identifier.citationFarsang , S , Franchi , I A , Zhao , X , Raub , T D , Redfern , S A T , Grady , M M & Zolensky , M 2021 , ' Carbonate assemblages in Cold Bokkeveld CM chondrite reveal complex parent body evolution ' , Meteoritics & Planetary Science , vol. Early View .
dc.identifier.otherPURE: 274064322
dc.identifier.otherPURE UUID: d9e690b0-5125-403c-9480-8bc8c148f5f0
dc.identifier.otherJisc: 1b4ae6bc73bf400ebccec1e04c9b5b54
dc.identifier.otherpublisher-id: maps13647
dc.identifier.otherORCID: /0000-0003-4513-2245/work/93514689
dc.identifier.otherWOS: 000645925500001
dc.identifier.otherScopus: 85105135503
dc.descriptionThis work was supported by the Royal Astronomical Society (Paneth Meteorite Trust Award to MMG), the Natural Environment Research Council (grant number NE/L002507/1), and the Science and Technology Facilities Council (grant number ST/P000657/1 for IAF at the Open University).en
dc.description.abstractThe paragenesis of carbonates in the Cold Bokkeveld CM chondrite is determined from a detailed petrographic, chemical, spectroscopic, and isotopic study of nine associations of carbonates (aragonite, calcite, and dolomite) with other secondary minerals that occur within the meteorite. Our study reveals the existence of carbonates displaying petrographic features that are distinct from those of type 1 and type 2 carbonates commonly observed in CM2 meteorites. These include carbonates interstitial to octahedral magnetite crystals, for which a new designation of “type 1c” is suggested. The O isotopic values of dolomite (δ18O ranging from +21.1 to +25.8‰ and Δ17O from −4.9 to −4.0‰) are similar to those measured in dolomites from other CM chondrites. The presence of complex carbonates with a CaCO3 core and Mg‐enriched rim implies several generations of fluids and/or their evolving composition on the CM parent body(ies). Petrographic characteristics indicate at least six stages of potentially overlapping carbonate and phyllosilicate formation events. We show that type 1 and type 2 calcite have distinct Raman spectral characteristics. Type 1 calcite is characterized by very broad peaks, whereas type 2 calcite displays narrow peaks similar to those of typical abiotic terrestrial calcite, suggesting high crystallinity. A carbonate Raman spectrum showing features characteristic of both aragonite and calcite likely documents an aragonite‐calcite phase transition. Raman spectroscopy also reveals the presence of organic matter in the majority of carbonates. This indicates that organic carbon was mobilized by aqueous fluids for extended periods.
dc.relation.ispartofMeteoritics & Planetary Scienceen
dc.rightsCopyright © 2021 The Authors. Meteoritics & Planetary Science published by Wiley Periodicals LLC on behalf of The Meteoritical Society (MET). This is an open access article under the terms of the Creative Commons Attribution License, which permits use, distribution and reproduction in any medium, provided the original work is properly cited.en
dc.subjectGE Environmental Sciencesen
dc.titleCarbonate assemblages in Cold Bokkeveld CM chondrite reveal complex parent body evolutionen
dc.typeJournal articleen
dc.description.versionPublisher PDFen
dc.contributor.institutionUniversity of St Andrews.International Education Instituteen
dc.contributor.institutionUniversity of St Andrews.School of Earth & Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews.St Andrews Centre for Exoplanet Scienceen
dc.description.statusPeer revieweden

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