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Investigating evidence of high frequency glacial eustacy in the Lower Mississippian (Tournasian) Lodgepole Formation of southwest Montana : insights from conodont oxygen isotopes

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Please use this identifier to cite or link to this item: http://hdl.handle.net/1928/13115

Investigating evidence of high frequency glacial eustacy in the Lower Mississippian (Tournasian) Lodgepole Formation of southwest Montana : insights from conodont oxygen isotopes

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dc.contributor.author Wallace, Zachary
dc.date.accessioned 2011-08-30T19:29:48Z
dc.date.available 2011-08-30T19:29:48Z
dc.date.issued 2011-08-30
dc.date.submitted July 2011
dc.identifier.uri http://hdl.handle.net/1928/13115
dc.description.abstract This study focuses on high-frequency, subtidal-carbonate cycles (1-8 m thick) within the Woodhurst Member of the Lower Mississippian Lodgepole Formation of southwest Montana. We combined conodont-oxygen isotopes (δ18Oapatite¬) and carbonate-carbon isotopes (δ13Ccarb) with cyclostratigraphy of Woodhurst cycles to test the hypothesis that the cycles developed in response to glacial eustasy, evaluate the timing and initiation of the Late Paleozoic Ice Age (LPIA), and to better understand the carbon budget in response to cycle formation. δ18Oapatite trends across targeted cycles support the hypothesis of glacial eustatic origins along with cooling surface seawater temperatures. High-resolution δ13Ccarb analysis of whole-rock limestones within eleven cycles reveal invariant or nonsystematic δ13Ccarb trends, but the long term trend confirms a major positive excursion reported in previous studies of coeval deposits, values peak at ~ 7.5 ‰ in the upper S. isosticha conodont Zone. en_US
dc.language.iso en_US en_US
dc.subject Early Mississippian, Conodonts, Lodgepole Formation, Cycles en_US
dc.subject.lcsh Geology, Stratigraphic--Mississippian.
dc.subject.lcsh Cyclostratigraphy--Montana.
dc.subject.lcsh Conodonts--Montana.
dc.subject.lcsh Glacial isostasy.
dc.title Investigating evidence of high frequency glacial eustacy in the Lower Mississippian (Tournasian) Lodgepole Formation of southwest Montana : insights from conodont oxygen isotopes en_US
dc.type Thesis en_US
dc.description.degree Earth and Planetary Sciences en_US
dc.description.level Masters en_US
dc.description.department University of New Mexico. Dept. of Earth and Planetary Sciences en_US
dc.description.advisor Elrick, Maya
dc.description.committee-member Atudorei, Viorel
dc.description.committee-member Fawcett, Peter


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