Show simple item record

dc.contributor.authorMcgee, Michelle Marie
dc.date.accessioned2018-07-11T01:04:09Z
dc.date.available2018-07-11T01:04:09Z
dc.date.issued2004
dc.identifier.urihttp://hdl.handle.net/11122/8782
dc.descriptionDissertation (Ph.D.) University of Alaska Fairbanks, 2004
dc.description.abstractThis study utilizes high-resolution stratigraphy and sequence stratigraphy to document the response of the Carboniferous Lisburne Group carbonate platform during a change from greenhouse to icehouse conditions. The Lisburne Group in northern Alaska represents a laterally extensive carbonate ramp deposited on a passive continental margin during a greenhouse to icehouse transition. The Lisburne Group is subdivided into the Mississippian Wachsmuth and Alapah Limestones and Mississippian to Pennsylvanian Wahoo Limestone. I have identified six depositional sequences and corresponding systems tracts within the Lisburne Group based on bounding surfaces, cycle stacking patterns, and lateral lithofacies relationships. The Wachsmuth Limestone (Sequences I and II) is comprised of relatively thick cycles that have a "layer cake" stacking pattern that records minor migration of facies. Cycles in the uppermost Wachsmuth Limestone and the Alapah Limestone (Sequences III and IV) are thick, less "layer cake"-like, have deep water tongues at the base, and record significant migration of facies. Cycles in the uppermost Alapah Limestone and the Wahoo Limestone (Sequences V and VI) are thin, juxtapose deep water over shallow water facies, and record significant migration of facies. An unconformity marked by paleosols and karst features has been documented near the Mississippian-Pennsylvanian boundary in the Wahoo Limestone. I interpret the distinct change in cycle stacking patterns between the Mississippian and Pennsylvanian Lisburne Group to be related to changes in Paleoclimate. I interpret Sequences I through IV to be deposited during a greenhouse and transitional climate; whereas, Sequences V and VI were deposited during an icehouse climate.
dc.subjectGeology
dc.titleCarboniferous Lisburne Group Carbonates Of The Porcupine Lake Valley: Implications For Surface To Subsurface Sequence Stratigraphy, Paleogeography, And Paleoclimatology
dc.typeDissertation
dc.type.degreephd
dc.identifier.departmentDepartment of Geology and Geophysics
dc.contributor.chairWhalen, Michael T.
refterms.dateFOA2020-03-05T16:16:25Z


Files in this item

Thumbnail
Name:
McGee_M_2004.pdf
Size:
13.63Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record