Show simple item record

dc.contributor.authorRizzo, Alec J.
dc.date.accessioned2015-11-18T01:23:59Z
dc.date.available2015-11-18T01:23:59Z
dc.date.issued2015-08
dc.identifier.urihttp://hdl.handle.net/11122/6197
dc.descriptionThesis (M.S.) University of Alaska Fairbanks, 2015en_US
dc.description.abstractThe NE-trending Nenana basin is a Cenozoic-aged basin located in central Alaska between the Denali and Tintina fault systems. The narrow, deep basin is a current exploration target for oil and gas resources in Interior Alaska. Natural fractures were analyzed to further understand larger structural features such as faults and folds related to the structural evolution of the Nenana basin and surrounding areas. Fracture sets were measured and described on the margin of the basin at four field locations: the Fairbanks area, along the Parks Highway between Fairbanks and Nenana, and in outcrop around the Nenana and Healy areas. In addition to measuring fracture sets in outcrop and collecting oriented samples, statistical and thin section analyses were used to further analyze fracture characteristics. Calcite twin thermometry and apatite fission track analysis were used to constrain the timing and thermal evolution of the field area. Based on the orientations of observed map-scale faults, folds, and fracture sets, I divided the four field locations into two structural domains. Domain I is characterized by NE-striking faults and associated active seismicity while Domain II is dominated by E-W striking folds and faults related to the late Cenozoic development of the Northern Foothills fold-and-thrust belt. I interpret that fracture sets in Domain I are related to the evolution of high angle faulting between the Nenana basin and the Fairbanks area during Cenozoic time. In Domain II, I interpret fracture sets are related to the evolution of the fold-and-thrust belt north of the Alaska Range. By combining fracture characteristics and apatite fission track analyses I provide constraints for the timing and shear sense of larger structural features related to the opening history of the Nenana basin. Furthermore, I propose that the evolution of the Nenana basin took place in three distinct tectonic phases during the Cenozoic. The three phases represent the transition from a pure extensional setting in the Late Paleocene to oblique-extensional faulting from the Late Miocene to present day.en_US
dc.language.isoen_USen_US
dc.titleNatural fracture character and distribution adjacent to the Nenana basin, central Alaskaen_US
dc.typeThesisen_US
dc.type.degreemsen_US
dc.identifier.departmentDepartment of Geosciencesen_US
dc.contributor.chairHanks, Catherine
dc.contributor.committeeMcCarthy, Paul
dc.contributor.committeeNadin, Elisabeth
refterms.dateFOA2020-03-05T12:53:37Z


Files in this item

Thumbnail
Name:
Rizzo_uaf_0006N_10364.pdf
Size:
40.69Mb
Format:
PDF

This item appears in the following Collection(s)

Show simple item record