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- W3089343569 abstract "Mesosiderites are rare stony-iron meteorites with enigmatic origins. Their unusual mix of crustal andcore materials have inspired many formation theories over the last century. Some of the outstanding questions haveregarded the origin of the metal, whether it came from another celestial body or from within the parent body, andthe absence of mantle material. The role of impacts has been central to the theories, and yet the mesosiderites showlittle evidence of shock. The mystery of the origin of mesosiderites is further compounded by the lack of study, aswell as scarcity of samples. This thesis was designed to rectify this with the classification of the mesosideritesLamont, Acfer 265, QUE 86900, and MAC 88102, together with petrographic analysis of their textures. The classificationand analyses are performed with the help of polarised microscopy, SEM-EDS, and Raman spectrometry.Lamont is classified as a B4, Acfer 265 and QUE 86900 as A1, and MAC 88102 as an A4 mesosiderite. Observationsof sets of parallel lamellae in cristobalite and anorthite in Lamont, and an immiscible silicate emulsion andpyroxene-troilite melt droplets in QUE 86900 are proposed to be shock-related features. In Lamont, these texturesare interpreted to be subsequent to the initial impact which mixed crustal and core material, and prior to deep burial.The textures in QUE 86900 are interpreted as coeval with the initial impact. Finally, a modified theory of formationfor mesosiderites is presented, where the textural sub-groups formed as a result of variable initial burial depth andsubsequent shock- and thermal metamorphism caused by impact gardening. In this modified theory, continuousaccretion of material forms a thick and thermally insulating regolith, necessary for the slow cooling rates observedin mesosiderites." @default.
- W3089343569 created "2020-10-08" @default.
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- W3089343569 date "2020-01-01" @default.
- W3089343569 modified "2023-09-27" @default.
- W3089343569 title "Classification of four mesosiderites and implications for their formation" @default.
- W3089343569 hasPublicationYear "2020" @default.
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