Differentiation of a CO2-rich, hydrous alkalic basalt and the genesis of carbonatites
dc.contributor.committeeMember | Dasgupta, Rajdeep | |
dc.contributor.committeeMember | Lee, Cin-Ty | |
dc.contributor.committeeMember | Torres, Mark | |
dc.creator | Rodriguez, Maria Raquel | |
dc.date.accessioned | 2024-05-20T20:20:33Z | |
dc.date.created | 2024-05 | |
dc.date.issued | 2024-03-20 | |
dc.date.submitted | May 2024 | |
dc.date.updated | 2024-05-20T20:20:33Z | |
dc.description | EMBARGO NOTE: This item is embargoed until 2025-05-01 | |
dc.description.abstract | Intraplate 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. | |
dc.embargo.lift | 2025-05-01 | |
dc.embargo.terms | 2025-05-01 | |
dc.format.mimetype | application/pdf | |
dc.identifier.citation | Rodriguez, Maria. Differentiation of a CO2-rich, hydrous alkalic basalt and the genesis of carbonatites. (2024). Masters thesis, Rice University. https://hdl.handle.net/1911/115918 | |
dc.identifier.uri | https://hdl.handle.net/1911/115918 | |
dc.language.iso | eng | |
dc.rights | Copyright 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. | |
dc.subject | experimental petrology | |
dc.subject | carbonatites | |
dc.subject | magma evolution | |
dc.subject | alkaline magmas | |
dc.subject | intraplate settings | |
dc.subject | high temperature | |
dc.title | Differentiation of a CO2-rich, hydrous alkalic basalt and the genesis of carbonatites | |
dc.type | Thesis | |
dc.type.material | Text | |
thesis.degree.department | Earth Science | |
thesis.degree.discipline | Natural Sciences | |
thesis.degree.grantor | Rice University | |
thesis.degree.level | Masters | |
thesis.degree.name | Master of Science |