{"id":{"repo_id":"uiuc","oai_identifier":"oai:www.ideals.illinois.edu:2142/86547"},"canonical_url":"https://search.dev.ndltd.org/etd/uiuc/oai:www.ideals.illinois.edu:2142/86547","repository":{"repo_id":"uiuc","name":"University of Illinois - Urbana-Champaign","base_url":"https://www.ideals.illinois.edu/oai-pmh"},"display":{"title":"Origin and Diagenesis of Lacustrine Sediments of the Late Oligocene Creede Formation, Southwestern Colorado","abstract":"Vertically-zoned sequences of authigenic silicates in tuffs reflect alteration of silicic-intermediate vitric tuff within an elevated geothermal gradient (90$\\sp\\circ$-150$\\sp\\circ$C/km). The abundance of clinoptilolite - Al-smectite in drillcore CCM-2 is consistent with diagenetic waters having low to moderate salinity and a pH of 7-9. The higher-grade mineral assemblage (analcime, K-feldspar, quartz, interstratified illite/smectite and chlorite/smectite in CCM-1) is due to hotter fluids migrating through the more permeable strata. Alteration occurred in a relatively closed system. On the basis of studies of zeolite formation in other burial diagenetic systems, the observed authigenic silicate assemblage in tuffs of the Creede Formation must have formed within $\\sim$3-4 m.y. of deposition.","abstract_html":"Vertically-zoned sequences of authigenic silicates in tuffs reflect alteration of silicic-intermediate vitric tuff within an elevated geothermal gradient (90$\\sp\\circ$-150$\\sp\\circ$C/km). The abundance of clinoptilolite - Al-smectite in drillcore CCM-2 is consistent with diagenetic waters having low to moderate salinity and a pH of 7-9. The higher-grade mineral assemblage (analcime, K-feldspar, quartz, interstratified illite/smectite and chlorite/smectite in CCM-1) is due to hotter fluids migrating through the more permeable strata. Alteration occurred in a relatively closed system. On the basis of studies of zeolite formation in other burial diagenetic systems, the observed authigenic silicate assemblage in tuffs of the Creede Formation must have formed within $\\sim$3-4 m.y. of deposition.","abstract_has_math":true,"creators":["Finkelstein, David Barry"],"institution":"University of Illinois at Urbana-Champaign","degree_name":"Ph.D.","degree_level":"Dissertation","degree_discipline":"Geology","degree_department":null,"school":null,"contributors":["Altaner, Stephen P."],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2015,"date_issued":"2015-09-28T15:12:35Z","date_published":"2015-09-28T15:12:35Z","updated_at":"2026-07-22T22:26:27Z","subjects":["Geology"],"languages":["eng"],"rights":[],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["(MiAaPQ)AAI9812586"],"render_values":[{"text":"(MiAaPQ)AAI9812586","href":null,"code":true}]}]},"links":{"outbound_url":"http://hdl.handle.net/2142/86547","outbound_label":"Handle","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Altaner, Stephen P."]},{"key":"dc:creator","label":"Author","values":["Finkelstein, David Barry"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date","label":"Dc Date","values":["2015-09-28T15:12:35Z","10000-01-01","1997"]},{"key":"dc:type","label":"Dc Type","values":["text"]},{"key":"thesis:degree_discipline","label":"Discipline","values":["Geology"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Dissertation"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["University of Illinois at Urbana-Champaign"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Geology"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language","label":"Dc Language","values":["eng"]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier","label":"Identifier","values":["http://hdl.handle.net/2142/86547","(MiAaPQ)AAI9812586"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description","label":"Description","values":["Vertically-zoned sequences of authigenic silicates in tuffs reflect alteration of silicic-intermediate vitric tuff within an elevated geothermal gradient (90$\\sp\\circ$-150$\\sp\\circ$C/km). The abundance of clinoptilolite - Al-smectite in drillcore CCM-2 is consistent with diagenetic waters having low to moderate salinity and a pH of 7-9. The higher-grade mineral assemblage (analcime, K-feldspar, quartz, interstratified illite/smectite and chlorite/smectite in CCM-1) is due to hotter fluids migrating through the more permeable strata. Alteration occurred in a relatively closed system. On the basis of studies of zeolite formation in other burial diagenetic systems, the observed authigenic silicate assemblage in tuffs of the Creede Formation must have formed within $\\sim$3-4 m.y. of deposition.","Made available in DSpace on 2015-09-28T15:12:35Z (GMT). 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The abundance of clinoptilolite - Al-smectite in drillcore CCM-2 is consistent with diagenetic waters having low to moderate salinity and a pH of 7-9. The higher-grade mineral assemblage (analcime, K-feldspar, quartz, interstratified illite/smectite and chlorite/smectite in CCM-1) is due to hotter fluids migrating through the more permeable strata. Alteration occurred in a relatively closed system. On the basis of studies of zeolite formation in other burial diagenetic systems, the observed authigenic silicate assemblage in tuffs of the Creede Formation must have formed within $\\sim$3-4 m.y. of deposition.","Made available in DSpace on 2015-09-28T15:12:35Z (GMT). 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