{"id":{"repo_id":"bayreuth","oai_identifier":"oai:epub.uni-bayreuth.de:617"},"canonical_url":"https://search.dev.ndltd.org/etd/bayreuth/oai:epub.uni-bayreuth.de:617","repository":{"repo_id":"bayreuth","name":"Universität Bayreuth","base_url":"https://epub.uni-bayreuth.de/cgi/oai2"},"display":{"title":"Experimental Constraints on Silicate Perovskite Forming Reactions and Elastic Properties: Geophysical Implications for Chemical Heterogeneity in the Deep Mantle","abstract":"Three experimental investigations have been performed in order to understand how the composition of the mantle may influence mineral stability and elastic properties and how these may influence seismic properties of the deep mantle. The phase relations of calcium perovskite have been studied in high pressure and temperature experiments to examine the effect of its formation on seismic discontinuity features at 520 km depth in the mantle. The effect of varying composition on the compressibility of magnesium silicate perovskite has been examined in order to understand the geophysical consequences of chemical heterogeneity in the lower mantle. Calorimetric measurements of the pyrope-majorite garnet solid solution have been made to provide essential thermodynamic data for modeling the formation reactions of both magnesium and calcium silicate perovskite.","abstract_html":"Three experimental investigations have been performed in order to understand how the composition of the mantle may influence mineral stability and elastic properties and how these may influence seismic properties of the deep mantle. The phase relations of calcium perovskite have been studied in high pressure and temperature experiments to examine the effect of its formation on seismic discontinuity features at 520 km depth in the mantle. The effect of varying composition on the compressibility of magnesium silicate perovskite has been examined in order to understand the geophysical consequences of chemical heterogeneity in the lower mantle. Calorimetric measurements of the pyrope-majorite garnet solid solution have been made to provide essential thermodynamic data for modeling the formation reactions of both magnesium and calcium silicate perovskite.","abstract_has_math":false,"creators":["Ashima, Saikia"],"institution":"Universität Bayreuth","degree_name":null,"degree_level":"thesis.doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":["Rubie, David C. Prof"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2008,"date_issued":"2008-02-06","date_published":"2008-02-06","updated_at":"2026-07-27T18:49:19Z","subjects":[],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://epub.uni-bayreuth.de/id/eprint/617/","outbound_label":"Repository record","outbound_source":"source_url"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Rubie, David C. Prof"]},{"key":"dc:creator","label":"Author","values":["Ashima, Saikia"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:publisher","label":"Institution","values":["Universität Bayreuth"]},{"key":"dc:type","label":"Dc Type","values":["doctoralThesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["thesis.doctoral"]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Universität Bayreuth"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["Three experimental investigations have been performed in order to understand how the composition of the mantle may influence mineral stability and elastic properties and how these may influence seismic properties of the deep mantle. The phase relations of calcium perovskite have been studied in high pressure and temperature experiments to examine the effect of its formation on seismic discontinuity features at 520 km depth in the mantle. The effect of varying composition on the compressibility of magnesium silicate perovskite has been examined in order to understand the geophysical consequences of chemical heterogeneity in the lower mantle. Calorimetric measurements of the pyrope-majorite garnet solid solution have been made to provide essential thermodynamic data for modeling the formation reactions of both magnesium and calcium silicate perovskite.","Im Rahmen der vorliegenden Doktorarbeit wurden drei experimentelle Untersuchungen durchgeführt, um zu verstehen, wie die Zusammensetzung des Erdmantels die Stabilität von Mineralen und ihre elastische Eigenschaften bestimmt, und wie diese wiederum die seismischen Eigenschaften des tiefen Erdmantels beeinflussen. Die Phasenbeziehungen von Calciumsilikat-Perowskit wurden in Hochdruck-Hochtemperaturexperimenten untersucht, um den Effekt seiner Bildung auf die Charakteristika der seismischen Diskontinuität bei 520 km Tiefe im Erdmantel zu bestimmen. Der Effekt von variabler Zuammensetzung auf die Kompressibilität von Magnesiumsilikat-Perowskit wurde untersucht, um die geophysikalischen Konsequenzen chemischer Heterogenität im Erdmantel zu verstehen. Kalorimetrische Messungen der Granatmischreihe Pyrop-Majorit wurden durchgeführt, um grundsätzliche thermodynamische Daten für die Modellierung der Bildungsreaktionen von Magnesium- und Calciumsilikat-Perowskit bereitzustellen."]},{"key":"dc:format.medium","label":"Dc Format Medium","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Experimental Constraints on Silicate Perovskite Forming Reactions and Elastic Properties: Geophysical Implications for Chemical Heterogeneity in the Deep Mantle"]}]}],"canonical_facts":{"dc:contributor":["Rubie, David C. Prof"],"dc:creator":["Ashima, Saikia"],"dc:description.abstract":["Three experimental investigations have been performed in order to understand how the composition of the mantle may influence mineral stability and elastic properties and how these may influence seismic properties of the deep mantle. The phase relations of calcium perovskite have been studied in high pressure and temperature experiments to examine the effect of its formation on seismic discontinuity features at 520 km depth in the mantle. The effect of varying composition on the compressibility of magnesium silicate perovskite has been examined in order to understand the geophysical consequences of chemical heterogeneity in the lower mantle. Calorimetric measurements of the pyrope-majorite garnet solid solution have been made to provide essential thermodynamic data for modeling the formation reactions of both magnesium and calcium silicate perovskite.","Im Rahmen der vorliegenden Doktorarbeit wurden drei experimentelle Untersuchungen durchgeführt, um zu verstehen, wie die Zusammensetzung des Erdmantels die Stabilität von Mineralen und ihre elastische Eigenschaften bestimmt, und wie diese wiederum die seismischen Eigenschaften des tiefen Erdmantels beeinflussen. Die Phasenbeziehungen von Calciumsilikat-Perowskit wurden in Hochdruck-Hochtemperaturexperimenten untersucht, um den Effekt seiner Bildung auf die Charakteristika der seismischen Diskontinuität bei 520 km Tiefe im Erdmantel zu bestimmen. Der Effekt von variabler Zuammensetzung auf die Kompressibilität von Magnesiumsilikat-Perowskit wurde untersucht, um die geophysikalischen Konsequenzen chemischer Heterogenität im Erdmantel zu verstehen. Kalorimetrische Messungen der Granatmischreihe Pyrop-Majorit wurden durchgeführt, um grundsätzliche thermodynamische Daten für die Modellierung der Bildungsreaktionen von Magnesium- und Calciumsilikat-Perowskit bereitzustellen."],"dc:format.medium":["application/pdf"],"dc:publisher":["Universität Bayreuth"],"dc:title":["Experimental Constraints on Silicate Perovskite Forming Reactions and Elastic Properties: Geophysical Implications for Chemical Heterogeneity in the Deep Mantle"],"dc:type":["doctoralThesis"],"thesis:degree_level":["thesis.doctoral"],"thesis:institution_name":["Universität Bayreuth"]},"updated_at":"2026-07-27T18:49:19Z"}