Pennsylvanian–Permian Aragonite to Calcite Sea Transitions in the Sverdrup Basin (Arctic Canada) and Cantabrian Basin (northern Spain)

dc.contributor.advisorBeauchamp, Benoit
dc.contributor.authorFernandes, Nikita Judith
dc.contributor.committeememberDutchak, Alex
dc.contributor.committeememberDewing, Keith
dc.date2021-11
dc.date.accessioned2021-07-19T15:54:39Z
dc.date.available2021-07-19T15:54:39Z
dc.date.issued2021-07-05
dc.description.abstractDetailed facies analysis of Carboniferous–Permian strata in the Sverdrup Basin (Arctic Canada) and Cantabrian Basin (northern Spain) has led to the recognition of short-lived calcite seas within a first-order aragonite sea. The first return to calcitic conditions is documented in Lower Pennsylvanian carbonate rocks and lasted approximately 4–6 Myrs based on the replacement of aragonitic algae and tangential ooids by calcitic algae and radial ooids in shallow water facies. A second return to calcite sea immediately after the Carboniferous–Permian boundary is documented within an individual cyclothem, ~400,000 years in duration, through a similar shift to calcitic biotic and abiotic elements. These findings indicate higher-order calcite-aragonite episodes may occur during first-order oscillations and are likely influenced by a variety of mechanisms such as magnesium to calcium ratio (Mg:Ca), pCO2, temperature, and carbonate saturation among others. In this study, both the Early Pennsylvanian and Early Permian returns to calcite seas are attributed to increases in atmospheric CO2 due to contemporaneous volcanic activity. As a result, excess CO2 was buffered through the shoaling of saturation horizons in the ocean resulting in the non-precipitation and/or dissolution of the more soluble mineral phases such as aragonite and high-Mg calcite. A very shallow aragonitic zone is inferred in the Sverdrup Basin compared to a slightly deeper interval in the Cantabrian Basin, which is due to the higher paleolatitude of the Sverdrup Basin. Shoaling of aragonite and HMC saturation horizons is currently occurring in modern oceans due to the increased uptake of CO2 accelerating the rate of ocean acidification. Therefore, one of the long-term consequences of continued increases in anthropogenic CO2 could be the establishment of oceanic conditions like those of a calcite sea.en_US
dc.identifier.citationFernandes, N. J. (2021). Pennsylvanian–Permian Aragonite to Calcite Sea Transitions in the Sverdrup Basin (Arctic Canada) and Cantabrian Basin (northern Spain) (Master's thesis, University of Calgary, Calgary, Canada). Retrieved from https://prism.ucalgary.ca.en_US
dc.identifier.doihttp://dx.doi.org/10.11575/PRISM/39019
dc.identifier.urihttp://hdl.handle.net/1880/113645
dc.language.isoengen_US
dc.publisher.facultyScienceen_US
dc.publisher.institutionUniversity of Calgaryen
dc.rightsUniversity of Calgary graduate students retain copyright ownership and moral rights for their thesis. You may use this material in any way that is permitted by the Copyright Act or through licensing that has been assigned to the document. For uses that are not allowable under copyright legislation or licensing, you are required to seek permission.en_US
dc.subjectSverdrup Basinen_US
dc.subjectCantabrian Basinen_US
dc.subjectCalcite Seaen_US
dc.subjectAragonite Seaen_US
dc.subjectPennsylvanianen_US
dc.subjectPermianen_US
dc.subject.classificationGeologyen_US
dc.titlePennsylvanian–Permian Aragonite to Calcite Sea Transitions in the Sverdrup Basin (Arctic Canada) and Cantabrian Basin (northern Spain)en_US
dc.typemaster thesisen_US
thesis.degree.disciplineGeoscienceen_US
thesis.degree.grantorUniversity of Calgaryen_US
thesis.degree.nameMaster of Science (MSc)en_US
ucalgary.item.requestcopytrueen_US
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