{"id":{"repo_id":"ku","oai_identifier":"oai:kuscholarworks.ku.edu:1808/35374"},"canonical_url":"https://search.dev.ndltd.org/etd/ku/oai:kuscholarworks.ku.edu:1808/35374","repository":{"repo_id":"ku","name":"University of Kansas","base_url":"https://kuscholarworks.ku.edu/server/oai/request"},"display":{"title":"Carbonate Carbon Isotope Chemostratigraphy from the Ruby Ranch Member of the Cedar Mountain Formation in the Western San Rafael Swell","abstract":"The Ruby Ranch Member of the Cedar Mountain Formation in East-Central Utah represents terrestrial deposits in the early Cretaceous Period. This member has been studied at multiple field locations and has been determined to span the Aptian-Albian Boundary based on chemostratigraphic and detrital zircon studies. The study location presented here, Moore CutoffRoad, is further west than previous studies, and thought to be a more expanded section that may contribute more detail to the chemostratigraphic and paleoclimatic record. The Ruby Ranch Member in this area consists mainly of reddish grey and greenish gray silty-sandy mudstones with abundant carbonate nodules suggestive of paleosol development. For this study samples were collected approximately every 25 cm and were used to construct a C-isotope curve using carbonate carbon. These were used to compare to existing bulk sedimentary organic carbon isotope curves. A total of 48 samples were analyzed and values from -7.45 ‰ vs. VPDB to -3.52 ‰ vs. VPDB were observed. The C-isotope data follows the trend of existing organic carbon isotope curves which exhibits the C10 positive isotope excursion near the Aptian-Albian boundary. A set of samples have been analyzed for pCO2 values. These values were calculated using both a high and low value for both S(z) and temperature. pCO2 values range from 795 ppmV to 2850 ppmV over the 4 scenarios presented. A subset of samples have been analyzed for clumped isotope paleothermometry to test a hypothesis that this positive isotope excursion corresponds with a late Aptian “cold snap” in an otherwise greenhouse climate. This data produced values that were not reliable estimates of temperature. Additional studies are needed to confirm a temperature change over the C10 positive isotope excursion and refine the paleoclimate record at this location.","abstract_html":"The Ruby Ranch Member of the Cedar Mountain Formation in East-Central Utah represents terrestrial deposits in the early Cretaceous Period. This member has been studied at multiple field locations and has been determined to span the Aptian-Albian Boundary based on chemostratigraphic and detrital zircon studies. The study location presented here, Moore CutoffRoad, is further west than previous studies, and thought to be a more expanded section that may contribute more detail to the chemostratigraphic and paleoclimatic record. The Ruby Ranch Member in this area consists mainly of reddish grey and greenish gray silty-sandy mudstones with abundant carbonate nodules suggestive of paleosol development. For this study samples were collected approximately every 25 cm and were used to construct a C-isotope curve using carbonate carbon. These were used to compare to existing bulk sedimentary organic carbon isotope curves. A total of 48 samples were analyzed and values from -7.45 ‰ vs. VPDB to -3.52 ‰ vs. VPDB were observed. The C-isotope data follows the trend of existing organic carbon isotope curves which exhibits the C10 positive isotope excursion near the Aptian-Albian boundary. A set of samples have been analyzed for pCO2 values. These values were calculated using both a high and low value for both S(z) and temperature. pCO2 values range from 795 ppmV to 2850 ppmV over the 4 scenarios presented. A subset of samples have been analyzed for clumped isotope paleothermometry to test a hypothesis that this positive isotope excursion corresponds with a late Aptian “cold snap” in an otherwise greenhouse climate. This data produced values that were not reliable estimates of temperature. Additional studies are needed to confirm a temperature change over the C10 positive isotope excursion and refine the paleoclimate record at this location.","abstract_has_math":false,"creators":["Gottberg, Amy"],"institution":"University of Kansas","degree_name":null,"degree_level":null,"degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Suarez, Marina"],"committee_chairs":[],"committee_members":[],"year":2022,"date_issued":"2022-05-31","date_published":"2022-05-31","updated_at":"2026-07-24T02:44:56Z","subjects":["Geochemistry","Paleoclimate"],"languages":["en"],"rights":["Copyright held by the author."],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["http://dissertations.umi.com/ku:18153"],"render_values":[{"text":"http://dissertations.umi.com/ku:18153","href":"http://dissertations.umi.com/ku:18153","code":true}]}]},"links":{"outbound_url":"https://hdl.handle.net/1808/35374","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Suarez, Marina"]},{"key":"dc:creator","label":"Author","values":["Gottberg, Amy"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2024-07-06T15:08:21Z"]},{"key":"dc:date.available","label":"Dc Date Available","values":["2024-07-06T15:08:21Z"]},{"key":"dc:date.issued","label":"Date","values":["2022-05-31"]},{"key":"dc:publisher","label":"Institution","values":["University of Kansas"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Geochemistry","Paleoclimate"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Copyright held by the author."]}]},{"id":"identifiers","label":"Identifiers","entries":[{"key":"dc:identifier.other","label":"Dc Identifier Other","values":["http://dissertations.umi.com/ku:18153"]},{"key":"dc:identifier.uri","label":"Identifier URI","values":["https://hdl.handle.net/1808/35374"]}]},{"id":"additional","label":"Additional Metadata","entries":[{"key":"dc:description.abstract","label":"Abstract","values":["The Ruby Ranch Member of the Cedar Mountain Formation in East-Central Utah represents terrestrial deposits in the early Cretaceous Period. This member has been studied at multiple field locations and has been determined to span the Aptian-Albian Boundary based on chemostratigraphic and detrital zircon studies. The study location presented here, Moore CutoffRoad, is further west than previous studies, and thought to be a more expanded section that may contribute more detail to the chemostratigraphic and paleoclimatic record. The Ruby Ranch Member in this area consists mainly of reddish grey and greenish gray silty-sandy mudstones with abundant carbonate nodules suggestive of paleosol development. For this study samples were collected approximately every 25 cm and were used to construct a C-isotope curve using carbonate carbon. These were used to compare to existing bulk sedimentary organic carbon isotope curves. A total of 48 samples were analyzed and values from -7.45 ‰ vs. VPDB to -3.52 ‰ vs. VPDB were observed. The C-isotope data follows the trend of existing organic carbon isotope curves which exhibits the C10 positive isotope excursion near the Aptian-Albian boundary. A set of samples have been analyzed for pCO2 values. These values were calculated using both a high and low value for both S(z) and temperature. pCO2 values range from 795 ppmV to 2850 ppmV over the 4 scenarios presented. A subset of samples have been analyzed for clumped isotope paleothermometry to test a hypothesis that this positive isotope excursion corresponds with a late Aptian “cold snap” in an otherwise greenhouse climate. This data produced values that were not reliable estimates of temperature. Additional studies are needed to confirm a temperature change over the C10 positive isotope excursion and refine the paleoclimate record at this location."]},{"key":"dc:title","label":"Title","values":["Carbonate Carbon Isotope Chemostratigraphy from the Ruby Ranch Member of the Cedar Mountain Formation in the Western San Rafael Swell"]}]}],"canonical_facts":{"dc:contributor.advisor":["Suarez, Marina"],"dc:creator":["Gottberg, Amy"],"dc:date.accessioned":["2024-07-06T15:08:21Z"],"dc:date.available":["2024-07-06T15:08:21Z"],"dc:date.issued":["2022-05-31"],"dc:description.abstract":["The Ruby Ranch Member of the Cedar Mountain Formation in East-Central Utah represents terrestrial deposits in the early Cretaceous Period. This member has been studied at multiple field locations and has been determined to span the Aptian-Albian Boundary based on chemostratigraphic and detrital zircon studies. The study location presented here, Moore CutoffRoad, is further west than previous studies, and thought to be a more expanded section that may contribute more detail to the chemostratigraphic and paleoclimatic record. The Ruby Ranch Member in this area consists mainly of reddish grey and greenish gray silty-sandy mudstones with abundant carbonate nodules suggestive of paleosol development. For this study samples were collected approximately every 25 cm and were used to construct a C-isotope curve using carbonate carbon. These were used to compare to existing bulk sedimentary organic carbon isotope curves. A total of 48 samples were analyzed and values from -7.45 ‰ vs. VPDB to -3.52 ‰ vs. VPDB were observed. The C-isotope data follows the trend of existing organic carbon isotope curves which exhibits the C10 positive isotope excursion near the Aptian-Albian boundary. A set of samples have been analyzed for pCO2 values. These values were calculated using both a high and low value for both S(z) and temperature. pCO2 values range from 795 ppmV to 2850 ppmV over the 4 scenarios presented. A subset of samples have been analyzed for clumped isotope paleothermometry to test a hypothesis that this positive isotope excursion corresponds with a late Aptian “cold snap” in an otherwise greenhouse climate. This data produced values that were not reliable estimates of temperature. Additional studies are needed to confirm a temperature change over the C10 positive isotope excursion and refine the paleoclimate record at this location."],"dc:identifier.other":["http://dissertations.umi.com/ku:18153"],"dc:identifier.uri":["https://hdl.handle.net/1808/35374"],"dc:language.iso":["en"],"dc:publisher":["University of Kansas"],"dc:rights":["Copyright held by the author."],"dc:subject":["Geochemistry","Paleoclimate"],"dc:title":["Carbonate Carbon Isotope Chemostratigraphy from the Ruby Ranch Member of the Cedar Mountain Formation in the Western San Rafael Swell"],"dc:type":["Thesis"]},"updated_at":"2026-07-24T02:44:56Z"}