Differentiation of a CO2-rich, hydrous alkalic basalt and the genesis of carbonatites

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dc.contributor.committeeMemberDasgupta, Rajdeepen_US
dc.contributor.committeeMemberLee, Cin-Tyen_US
dc.contributor.committeeMemberTorres, Marken_US
dc.creatorRodriguez, Maria Raquelen_US
dc.date.accessioned2024-05-20T20:20:33Zen_US
dc.date.created2024-05en_US
dc.date.issued2024-03-20en_US
dc.date.submittedMay 2024en_US
dc.date.updated2024-05-20T20:20:33Zen_US
dc.descriptionEMBARGO NOTE: This item is embargoed until 2025-05-01en_US
dc.description.abstractIntraplate settings almost uniquely host alkaline magmas and carbonatites. Although these magmas are spatially connected, the petrogenetic link between alkali magmas such as ocean island basalts (OIBs) and carbonatites is not well established. While previous studies have sought to identify the source origin of these magmas, the mechanisms behind their differentiation remain poorly understood. To constrain the evolution of alkalic magmas at mid-lithospheric depths, we performed high pressure-temperature, phase equilibria experiments on a hydrous, CO2 rich mantle-derived partial melt composition. The experiments were conducted at 1.5-2.0 GPa and 1200-1500 °C. The experimentally generated samples were studied using electron probe micro-analysis, where phase assemblage consisted of olivine + clinopyroxene + spinel + carbonated-silicate melt ± calcite ± vapor. As the melt composition undergoes evolution, the initial stages of crystallization generate alkalic OIB-like compositions, which subsequently transition towards natural calcio-magnesio carbonatite compositions. Our findings suggest that a single volatile-rich parental melt composition can give rise to OIBs and carbonatites at varying conditions.en_US
dc.embargo.lift2025-05-01en_US
dc.embargo.terms2025-05-01en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.citationRodriguez, Maria. Differentiation of a CO2-rich, hydrous alkalic basalt and the genesis of carbonatites. (2024). Masters thesis, Rice University. https://hdl.handle.net/1911/115918en_US
dc.identifier.urihttps://hdl.handle.net/1911/115918en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectexperimental petrologyen_US
dc.subjectcarbonatitesen_US
dc.subjectmagma evolutionen_US
dc.subjectalkaline magmasen_US
dc.subjectintraplate settingsen_US
dc.subjecthigh temperatureen_US
dc.titleDifferentiation of a CO2-rich, hydrous alkalic basalt and the genesis of carbonatitesen_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentEarth Scienceen_US
thesis.degree.disciplineNatural Sciencesen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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