{"id":{"repo_id":"rice","oai_identifier":"oai:repository.rice.edu:1911/87794"},"canonical_url":"https://search.dev.ndltd.org/etd/rice/oai:repository.rice.edu:1911/87794","repository":{"repo_id":"rice","name":"Rice University","base_url":"https://repository.rice.edu/server/oai/request"},"display":{"title":"Carbon in Silicate Melt - Experimental Constraints and Applications for the Subduction Zone and Magma Ocean Carbon Cycles","abstract":"We conducted high pressure and temperature experiments to determine the pressure, temperature, H2O content, and oxygen fugacity dependence of CO2 solubility on natural hydrous rhyolitic melts. These studies are applicable to subduction zone settings of the Earth throughout its history. Carbon concentrations and speciation were measured using FTIR, and in the process, we determined absorption coefficients for the CO2 species (CO2mol. and CO32-) for natural rhyolitic glass. We also developed empirical and thermodynamically-based models that describe the CO2 content of our compositions as a function of pressure, temperature, H2O content, and oxygen fugacity. We applied these models to predict the amount of CO2 that could be released via partial melt from subducted slab and carried up to the source region of arc volcanoes. We also conducted experiments to determine the compositional dependence of CO2 solubility on compositions spanning the range from natural basalt toward peridotite. These mafic to ultramafic compositions were used to constrain the carbon content of early Earth’s magma ocean. Combining our experiments with previous work, we developed an empirical model that describes the dissolved CO2 content as a function of pressure, temperature, H2O content, oxygen fugacity, and silicate composition. This model was applied to determine the amount of carbon contained in terrestrial magma oceans, and place constraints on the mantle carbon budget of the Earth.","abstract_html":"We conducted high pressure and temperature experiments to determine the pressure, temperature, H2O content, and oxygen fugacity dependence of CO2 solubility on natural hydrous rhyolitic melts. These studies are applicable to subduction zone settings of the Earth throughout its history. Carbon concentrations and speciation were measured using FTIR, and in the process, we determined absorption coefficients for the CO2 species (CO2mol. and CO32-) for natural rhyolitic glass. We also developed empirical and thermodynamically-based models that describe the CO2 content of our compositions as a function of pressure, temperature, H2O content, and oxygen fugacity. We applied these models to predict the amount of CO2 that could be released via partial melt from subducted slab and carried up to the source region of arc volcanoes. We also conducted experiments to determine the compositional dependence of CO2 solubility on compositions spanning the range from natural basalt toward peridotite. These mafic to ultramafic compositions were used to constrain the carbon content of early Earth’s magma ocean. Combining our experiments with previous work, we developed an empirical model that describes the dissolved CO2 content as a function of pressure, temperature, H2O content, oxygen fugacity, and silicate composition. This model was applied to determine the amount of carbon contained in terrestrial magma oceans, and place constraints on the mantle carbon budget of the Earth.","abstract_has_math":false,"creators":["Duncan, Megan Sallie"],"institution":"Rice University","degree_name":"Doctor of Philosophy","degree_level":"Doctoral","degree_discipline":"Natural Sciences","degree_department":null,"school":null,"contributors":[],"advisors":["Dasgupta, Rajdeep"],"committee_chairs":[],"committee_members":["Lee, Cin-Ty A.","Whitmire, Ken H.","Lenardic, Adrian"],"year":2015,"date_issued":"2015-11-18","date_published":"2015-11-18","updated_at":"2026-07-24T04:10:39Z","subjects":["Carbon","silicate melt","subduction zone","magma ocean"],"languages":["eng"],"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."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/1911/87794","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Dasgupta, Rajdeep"]},{"key":"dc:contributor.committeemember","label":"Committee Member","values":["Lee, Cin-Ty A.","Whitmire, Ken H.","Lenardic, Adrian"]},{"key":"dc:creator","label":"Author","values":["Duncan, Megan Sallie"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2016-01-07T22:27:28Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2016-01-07T22:27:28Z"]},{"key":"dc:date.issued","label":"Date","values":["2015-11-18"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Natural Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Doctoral"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Doctor of Philosophy"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Rice University"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Carbon","silicate melt","subduction zone","magma ocean"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["eng"]},{"key":"dc:rights","label":"Dc Rights","values":["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."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1911/87794"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["We conducted high pressure and temperature experiments to determine the pressure, temperature, H2O content, and oxygen fugacity dependence of CO2 solubility on natural hydrous rhyolitic melts. These studies are applicable to subduction zone settings of the Earth throughout its history. Carbon concentrations and speciation were measured using FTIR, and in the process, we determined absorption coefficients for the CO2 species (CO2mol. and CO32-) for natural rhyolitic glass. We also developed empirical and thermodynamically-based models that describe the CO2 content of our compositions as a function of pressure, temperature, H2O content, and oxygen fugacity. We applied these models to predict the amount of CO2 that could be released via partial melt from subducted slab and carried up to the source region of arc volcanoes. We also conducted experiments to determine the compositional dependence of CO2 solubility on compositions spanning the range from natural basalt toward peridotite. These mafic to ultramafic compositions were used to constrain the carbon content of early Earth’s magma ocean. Combining our experiments with previous work, we developed an empirical model that describes the dissolved CO2 content as a function of pressure, temperature, H2O content, oxygen fugacity, and silicate composition. This model was applied to determine the amount of carbon contained in terrestrial magma oceans, and place constraints on the mantle carbon budget of the Earth."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Carbon in Silicate Melt - Experimental Constraints and Applications for the Subduction Zone and Magma Ocean Carbon Cycles"]}]}],"canonical_facts":{"dc:contributor.advisor":["Dasgupta, Rajdeep"],"dc:contributor.committeemember":["Lee, Cin-Ty A.","Whitmire, Ken H.","Lenardic, Adrian"],"dc:creator":["Duncan, Megan Sallie"],"dc:date.accessioned":["2016-01-07T22:27:28Z"],"dc:date.available":["2016-01-07T22:27:28Z"],"dc:date.issued":["2015-11-18"],"dc:description.abstract":["We conducted high pressure and temperature experiments to determine the pressure, temperature, H2O content, and oxygen fugacity dependence of CO2 solubility on natural hydrous rhyolitic melts. These studies are applicable to subduction zone settings of the Earth throughout its history. Carbon concentrations and speciation were measured using FTIR, and in the process, we determined absorption coefficients for the CO2 species (CO2mol. and CO32-) for natural rhyolitic glass. We also developed empirical and thermodynamically-based models that describe the CO2 content of our compositions as a function of pressure, temperature, H2O content, and oxygen fugacity. We applied these models to predict the amount of CO2 that could be released via partial melt from subducted slab and carried up to the source region of arc volcanoes. We also conducted experiments to determine the compositional dependence of CO2 solubility on compositions spanning the range from natural basalt toward peridotite. These mafic to ultramafic compositions were used to constrain the carbon content of early Earth’s magma ocean. Combining our experiments with previous work, we developed an empirical model that describes the dissolved CO2 content as a function of pressure, temperature, H2O content, oxygen fugacity, and silicate composition. This model was applied to determine the amount of carbon contained in terrestrial magma oceans, and place constraints on the mantle carbon budget of the Earth."],"dc:format.mimetype":["application/pdf"],"dc:identifier.uri":["https://hdl.handle.net/1911/87794"],"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":["Carbon","silicate melt","subduction zone","magma ocean"],"dc:title":["Carbon in Silicate Melt - Experimental Constraints and Applications for the Subduction Zone and Magma Ocean Carbon Cycles"],"dc:type":["Thesis"],"thesis:degree_discipline":["Natural Sciences"],"thesis:degree_level":["Doctoral"],"thesis:degree_name":["Doctor of Philosophy"],"thesis:institution_name":["Rice University"]},"updated_at":"2026-07-24T04:10:39Z"}