Show simple item record

dc.contributor.authorKolker, Amanda M.
dc.date.accessioned2012-03-29T21:06:09Z
dc.date.available2012-03-29T21:06:09Z
dc.date.issued2008-12
dc.identifier.urihttp://hdl.handle.net/11122/78
dc.descriptionThesis (Ph.D.) University of Alaska Fairbanks, 2008
dc.description.abstractThe Central Alaskan Hot Springs Belt (CAHSB) is a vast stretch of low-temperature hydrothermal systems that has the potential to be a geothermal energy resource for remote communities in Alaska. Little exploration has occurred in the CAHSB and the resource is poorly understood. A geothermal power plant was installed in 2006 at Chena Hot Springs (CHS), one of the 30-plus hot springs in the CAHSB. This, in addition to the multiple direct use projects at CHS, could serve as a model for geothermal development elsewhere in the CAHSB. This dissertation evaluates the geologic setting of the CAHSB and explores the implications for resource capacity and sustainable energy production. The local geology and geochemical characteristics of CHS are characterized, with a focus on identifying ultimate heat source responsible for the hot springs. A radiogenic heat source model is proposed and tested for the entire CAHSB, wherein the anomalously radioactive plutons that are associated with nearly every hot spring are providing the source of heat driving the geothermal activity. This model appears to be feasible mechanism for the observed heat transfer. This implies that CAHSB “reservoir” fluids are probably low-temperature. It also suggests that individual hydrothermal systems are small-scale and localized features, unlike the types of hydrothermal systems that are conventionally exploited for energy (i.e., those that derive their heat from magmatic or deep crustal sources, which have higher reservoir temperatures and larger spatial extent). In this context, the individual capacity of several CAHSB resources close to communities is assessed, and a preliminary evaluation of the sustainability of the power production iii iv scheme at CHS is given. As another approach to the question of sustainability, this dissertation explores the ways in which external benefits of geothermal energy can influence the economics of a project. In sum, producing geothermal energy from CAHSB resources is somewhat risky at the present time, though it may be less risky than continued use of diesel fuel. The risks of geothermal development could be greatly reduced by rapid and immediate exploration efforts to collect much-needed data about CAHSB geothermal resources.en_US
dc.subjectAlaskaen_US
dc.subjecthot springsen_US
dc.subjectgeothermal energyen_US
dc.subjectChena Hot Springsen_US
dc.titleGeologic setting of the Central Alaskan hot springs belt: Implications for geothermal resource capacity and sustainable energy productionen_US
dc.typeThesis
dc.type.degreephd
dc.identifier.departmentDepartment of Geology and Geophysics
dc.contributor.chairEichelberger, John
dc.contributor.committeeNewberry, Rainer
dc.contributor.committeeLarsen, Jessica
dc.contributor.committeeColt, Steve
refterms.dateFOA2020-03-05T09:52:40Z


Files in this item

Thumbnail
Name:
Kolker.pdf
Size:
6.258Mb
Format:
PDF
Description:
Dissertation
Thumbnail
Name:
KolkerSignatures.pdf
Size:
1.392Mb
Format:
PDF
Description:
Signature Page

This item appears in the following Collection(s)

Show simple item record