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• W2051245358 endingPage "1935" @default.
• W2051245358 startingPage "1913" @default.
• W2051245358 abstract "Calcium aluminium-rich inclusions (CAIs) from the carbonaceous chondrite Cold Bokkeveld (CM2) have been located and characterised in situ; the textural environment of CM2 CAIs has been studied for the first time. Based on their primary mineralogy, 345 CAIs have been classified into four groups: (1) spinel inclusions, (2) a hibonite inclusion, (3) spinel-pyroxene (sp-py) inclusions, (4) spinel-pyroxene-olivine (sp-py-ol) inclusions. CAIs in Cold Bokkeveld experienced two stages of deformation. An earlier nebula stage predated the formation of the dust mantles that surround most CAIs, and a later stage occurred in an asteroidal regolith. The CAIs in CM2s are smaller than those in CV3 chondrites because of the greater intensity of the earlier fragmentation episode that they experienced. Aqueous alteration of CAIs and regolith deformation appear to have been simultaneous. Phase relations and pyroxene compositional trends in sp-py and sp-py-ol inclusions indicate that they crystallised from liquids. Most spinel-bearing inclusions in Cold Bokkeveld have a normal Mg isotopic composition, so they could not have formed by the simultaneous melting and evaporation of primitive dust. One inclusion is enriched in the heavy isotopes of Mg and may have formed in this way. Two (or more) events are required to form most of the inclusions. The first produced the refractory compositions, either by vapour/solid condensation or slow evaporation of primitive dust. The second event melted the refractory precursors which later crystallised to form the observed textures and mineral assemblages. It has been suggested that refractory spherules with inwardly radiating hibonites formed from molten droplets at temperatures as high as 2135°C. However, the crystallisation sequences of these inclusions inferred from textural evidence are incompatible with those derived from phase relations and estimates of bulk composition. It is concluded that CM2 refractory spherules did not form by crystallisation of molten droplets, but were derived by fragmentation of larger inclusions in which they formed by partial melting." @default.
• W2051245358 created "2016-06-24" @default.
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• W2051245358 date "1994-04-01" @default.
• W2051245358 modified "2023-10-18" @default.
• W2051245358 title "Formation and alteration of CAIs in Cold Bokkeveld (CM2)" @default.
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• W2051245358 doi "https://doi.org/10.1016/0016-7037(94)90424-3" @default.
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