{"id":{"repo_id":"uno","oai_identifier":"oai:scholarworks.uno.edu:td-1946"},"canonical_url":"https://search.dev.ndltd.org/etd/uno/oai:scholarworks.uno.edu:td-1946","repository":{"repo_id":"uno","name":"University of New Orleans","base_url":"https://scholarworks.uno.edu/do/oai/"},"display":{"title":"Mineralogy of Eudialyte Group Minerals From the East Hill Suite Of the Mont Saint-Hilaire Alkaline Plutonic Complex, Including an Alternative Site-Assignment Algorithm & A Proposed Classification System","abstract":"The twenty approved members of the eudialyte group are complex zirconosilicates, primarily with general formula N15M(1)6M(2)3M(3)M(4)Z3[Si24O72]O4X2. An algorithm was created to address the inherent recalculation difficulties in the absence of single-crystal X-ray data and was an overall improvement over previous schemes. Eudialyte group minerals were analyzed from the East Hill Suite of the Mont Saint-Hilaire alkaline complex. Recalculations revealed previously undocumented eudialyte-group compositions and degrees of chemical zonation. These data suggest that late-stage melt heterogeneity in alkaline systems is far more pronounced than previously thought. All analyses exhibited a negative neodymium anomaly in chondrite-normalized data. This supports data from other investigators that point to a preintrusion fractionation event in the underlying mantle. Potassium content of the eudialyte group minerals from the East Hill Suite was restricted to a narrow range, as was that of analyses from numerous other localities, suggesting some internal control on potassium content in eudialyte group minerals.","abstract_html":"The twenty approved members of the eudialyte group are complex zirconosilicates, primarily with general formula N15M(1)6M(2)3M(3)M(4)Z3[Si24O72]O4X2. An algorithm was created to address the inherent recalculation difficulties in the absence of single-crystal X-ray data and was an overall improvement over previous schemes. Eudialyte group minerals were analyzed from the East Hill Suite of the Mont Saint-Hilaire alkaline complex. Recalculations revealed previously undocumented eudialyte-group compositions and degrees of chemical zonation. These data suggest that late-stage melt heterogeneity in alkaline systems is far more pronounced than previously thought. All analyses exhibited a negative neodymium anomaly in chondrite-normalized data. This supports data from other investigators that point to a preintrusion fractionation event in the underlying mantle. Potassium content of the eudialyte group minerals from the East Hill Suite was restricted to a narrow range, as was that of analyses from numerous other localities, suggesting some internal control on potassium content in eudialyte group minerals.","abstract_has_math":false,"creators":["Tice, Peter"],"institution":null,"degree_name":"M.S.","degree_level":"Thesis","degree_discipline":"Earth and Environmental Sciences","degree_department":null,"school":null,"contributors":["Simmons, William B.","Webber, Karen","Falster, Alexander U."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2009,"date_issued":"2009-05-15T07:00:00Z","date_published":"2009-05-15T07:00:00Z","updated_at":"2026-07-24T05:28:56Z","subjects":["eudialyte","Mont Saint-Hilaire","recalculation","melt heterogeneity","neodymium anomaly"],"languages":[],"rights":[],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://scholarworks.uno.edu/td/965","outbound_label":"Repository record","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Simmons, William B.","Webber, Karen","Falster, Alexander U."]},{"key":"dc:creator","label":"Author","values":["Tice, Peter"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"thesis:degree_discipline","label":"Discipline","values":["Earth and Environmental Sciences"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Thesis"]},{"key":"thesis:degree_name","label":"Degree Name","values":["M.S."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["eudialyte","Mont Saint-Hilaire","recalculation","melt heterogeneity","neodymium anomaly"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["https://scholarworks.uno.edu/td/965"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The twenty approved members of the eudialyte group are complex zirconosilicates, primarily with general formula N15M(1)6M(2)3M(3)M(4)Z3[Si24O72]O4X2. An algorithm was created to address the inherent recalculation difficulties in the absence of single-crystal X-ray data and was an overall improvement over previous schemes. Eudialyte group minerals were analyzed from the East Hill Suite of the Mont Saint-Hilaire alkaline complex. Recalculations revealed previously undocumented eudialyte-group compositions and degrees of chemical zonation. These data suggest that late-stage melt heterogeneity in alkaline systems is far more pronounced than previously thought. All analyses exhibited a negative neodymium anomaly in chondrite-normalized data. This supports data from other investigators that point to a preintrusion fractionation event in the underlying mantle. Potassium content of the eudialyte group minerals from the East Hill Suite was restricted to a narrow range, as was that of analyses from numerous other localities, suggesting some internal control on potassium content in eudialyte group minerals."]},{"key":"dc:title","label":"Title","values":["Mineralogy of Eudialyte Group Minerals From the East Hill Suite Of the Mont Saint-Hilaire Alkaline Plutonic Complex, Including an Alternative Site-Assignment Algorithm & A Proposed Classification System"]}]}],"canonical_facts":{"dc:contributor":["Simmons, William B.","Webber, Karen","Falster, Alexander U."],"dc:creator":["Tice, Peter"],"dc:description.abstract":["The twenty approved members of the eudialyte group are complex zirconosilicates, primarily with general formula N15M(1)6M(2)3M(3)M(4)Z3[Si24O72]O4X2. An algorithm was created to address the inherent recalculation difficulties in the absence of single-crystal X-ray data and was an overall improvement over previous schemes. Eudialyte group minerals were analyzed from the East Hill Suite of the Mont Saint-Hilaire alkaline complex. Recalculations revealed previously undocumented eudialyte-group compositions and degrees of chemical zonation. These data suggest that late-stage melt heterogeneity in alkaline systems is far more pronounced than previously thought. All analyses exhibited a negative neodymium anomaly in chondrite-normalized data. This supports data from other investigators that point to a preintrusion fractionation event in the underlying mantle. Potassium content of the eudialyte group minerals from the East Hill Suite was restricted to a narrow range, as was that of analyses from numerous other localities, suggesting some internal control on potassium content in eudialyte group minerals."],"dc:identifier":["https://scholarworks.uno.edu/td/965"],"dc:subject":["eudialyte","Mont Saint-Hilaire","recalculation","melt heterogeneity","neodymium anomaly"],"dc:title":["Mineralogy of Eudialyte Group Minerals From the East Hill Suite Of the Mont Saint-Hilaire Alkaline Plutonic Complex, Including an Alternative Site-Assignment Algorithm & A Proposed Classification System"],"thesis:degree_discipline":["Earth and Environmental Sciences"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["M.S."]},"updated_at":"2026-07-24T05:28:56Z"}