{"id":{"repo_id":"baylor","oai_identifier":"oai:baylor-ir.tdl.org:2104/13942"},"canonical_url":"https://search.dev.ndltd.org/etd/baylor/oai:baylor-ir.tdl.org:2104/13942","repository":{"repo_id":"baylor","name":"Baylor University","base_url":"https://baylor-ir.tdl.org/server/oai/request"},"display":{"title":"Spatial heterogeneity in isotope and biomarker distributions : insights from the End-Devonian OAE in Western Canada.","abstract":"The availability of essential nutrients, such as nitrogen, phosphorus, and trace elements, fundamentally influences biological production. This is especially critical in tropical regions where stable thermal stratification in the water column is periodically disrupted by surface ocean current divergence experience upwelling, where deep, nutrient-rich waters rise to the surface, supporting high primary productivity. This comprehensive study of carbon and nitrogen isotopic composition, biomarker distribution, and trace element geochemistry across the Western Canada Sedimentary Basin (WCSB) delves into the complex interactions between nutrient cycling, primary productivity, and organic matter preservation in marine ecosystems, with a particular focus on the Late Devonian period, where similar perturbations of nutrient cycles led to the deposition of organic-rich rock units known as "black shales." Stratigraphic sections of black laminated and burrowed mudrock interspersed with siltstones and carbonaceous shales capture changes in paleoredox conditions, water depth, and tectonism over time. Overall, this research contributes to our current understanding of nutrient dynamics and across an ancient anoxic shallow marine basin and factors influencing preservation of biomarkers in the sediment record.","abstract_html":"The availability of essential nutrients, such as nitrogen, phosphorus, and trace elements, fundamentally influences biological production. This is especially critical in tropical regions where stable thermal stratification in the water column is periodically disrupted by surface ocean current divergence experience upwelling, where deep, nutrient-rich waters rise to the surface, supporting high primary productivity. This comprehensive study of carbon and nitrogen isotopic composition, biomarker distribution, and trace element geochemistry across the Western Canada Sedimentary Basin (WCSB) delves into the complex interactions between nutrient cycling, primary productivity, and organic matter preservation in marine ecosystems, with a particular focus on the Late Devonian period, where similar perturbations of nutrient cycles led to the deposition of organic-rich rock units known as "black shales." Stratigraphic sections of black laminated and burrowed mudrock interspersed with siltstones and carbonaceous shales capture changes in paleoredox conditions, water depth, and tectonism over time. Overall, this research contributes to our current understanding of nutrient dynamics and across an ancient anoxic shallow marine basin and factors influencing preservation of biomarkers in the sediment record.","abstract_has_math":false,"creators":["Dhar, Sanjukta, 1993-"],"institution":"Baylor University.","degree_name":"Ph.D.","degree_level":"Doctoral","degree_discipline":null,"degree_department":null,"school":null,"contributors":[],"advisors":["Fulton, James M."],"committee_chairs":[],"committee_members":[],"year":2025,"date_issued":"2025-08","date_published":"2025-08","updated_at":"2026-07-24T01:08:21Z","subjects":["Devonian.","Ocean anoxia.","Nitrogen cycling.","Trace element.","Thermal maturity.","Spatial variability.","Porphyrins.","Western Canada Sedimentary Basin.","Exshaw formation.","Upwelling.","Paleoenvironment.","Primary productivity.","Compound-specific nitrogen isotope.","Liquid chromatography.","Ocean anoxic events (OAE)"],"languages":["en"],"rights":["Baylor University works are protected by copyright. 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Contact libraryquestions@baylor.edu for inquiries about permission."],"rights_urls":[],"identifier_entries":[]},"links":{"outbound_url":"https://hdl.handle.net/2104/13942","outbound_label":"Handle","outbound_source":"dc:identifier.uri"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor.advisor","label":"Advisor","values":["Fulton, James M."]},{"key":"dc:creator","label":"Author","values":["Dhar, Sanjukta, 1993-"]}]},{"id":"academic_context","label":"Academic Context","entries":[{"key":"dc:date.accessioned","label":"Dc Date Accessioned","values":["2025-09-19T15:41:52Z"]},{"key":"dc:date.issued","label":"Date","values":["2025-08"]},{"key":"dc:type","label":"Dc Type","values":["Thesis"]},{"key":"thesis:degree_level","label":"Degree Level","values":["Doctoral"]},{"key":"thesis:degree_name","label":"Degree Name","values":["Ph.D."]},{"key":"thesis:institution_name","label":"Thesis Institution Name","values":["Baylor University."]}]},{"id":"subjects_keywords","label":"Subjects and Keywords","entries":[{"key":"dc:subject","label":"Dc Subject","values":["Devonian.","Ocean anoxia.","Nitrogen cycling.","Trace element.","Thermal maturity.","Spatial variability.","Porphyrins.","Western Canada Sedimentary Basin.","Exshaw formation.","Upwelling.","Paleoenvironment.","Primary productivity.","Compound-specific nitrogen isotope.","Liquid chromatography.","Ocean anoxic events (OAE)"]}]},{"id":"language_rights","label":"Language and Rights","entries":[{"key":"dc:language.iso","label":"Language (ISO)","values":["en"]},{"key":"dc:rights","label":"Dc Rights","values":["Baylor University works are protected by copyright. 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This comprehensive study of carbon and nitrogen isotopic composition, biomarker distribution, and trace element geochemistry across the Western Canada Sedimentary Basin (WCSB) delves into the complex interactions between nutrient cycling, primary productivity, and organic matter preservation in marine ecosystems, with a particular focus on the Late Devonian period, where similar perturbations of nutrient cycles led to the deposition of organic-rich rock units known as "black shales." Stratigraphic sections of black laminated and burrowed mudrock interspersed with siltstones and carbonaceous shales capture changes in paleoredox conditions, water depth, and tectonism over time. Overall, this research contributes to our current understanding of nutrient dynamics and across an ancient anoxic shallow marine basin and factors influencing preservation of biomarkers in the sediment record."]},{"key":"dc:format.mimetype","label":"Dc Format Mimetype","values":["application/pdf"]},{"key":"dc:title","label":"Title","values":["Spatial heterogeneity in isotope and biomarker distributions : insights from the End-Devonian OAE in Western Canada."]}]}],"canonical_facts":{"dc:contributor.advisor":["Fulton, James M."],"dc:creator":["Dhar, Sanjukta, 1993-"],"dc:date.accessioned":["2025-09-19T15:41:52Z"],"dc:date.issued":["2025-08"],"dc:description.abstract":["The availability of essential nutrients, such as nitrogen, phosphorus, and trace elements, fundamentally influences biological production. This is especially critical in tropical regions where stable thermal stratification in the water column is periodically disrupted by surface ocean current divergence experience upwelling, where deep, nutrient-rich waters rise to the surface, supporting high primary productivity. This comprehensive study of carbon and nitrogen isotopic composition, biomarker distribution, and trace element geochemistry across the Western Canada Sedimentary Basin (WCSB) delves into the complex interactions between nutrient cycling, primary productivity, and organic matter preservation in marine ecosystems, with a particular focus on the Late Devonian period, where similar perturbations of nutrient cycles led to the deposition of organic-rich rock units known as "black shales." Stratigraphic sections of black laminated and burrowed mudrock interspersed with siltstones and carbonaceous shales capture changes in paleoredox conditions, water depth, and tectonism over time. 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Contact libraryquestions@baylor.edu for inquiries about permission."],"dc:subject":["Devonian.","Ocean anoxia.","Nitrogen cycling.","Trace element.","Thermal maturity.","Spatial variability.","Porphyrins.","Western Canada Sedimentary Basin.","Exshaw formation.","Upwelling.","Paleoenvironment.","Primary productivity.","Compound-specific nitrogen isotope.","Liquid chromatography.","Ocean anoxic events (OAE)"],"dc:title":["Spatial heterogeneity in isotope and biomarker distributions : insights from the End-Devonian OAE in Western Canada."],"dc:type":["Thesis"],"thesis:degree_level":["Doctoral"],"thesis:degree_name":["Ph.D."],"thesis:institution_name":["Baylor University."]},"updated_at":"2026-07-24T01:08:21Z"}