{"id":{"repo_id":"unlv","oai_identifier":"oai:oasis.library.unlv.edu:rtds-2433"},"canonical_url":"https://search.dev.ndltd.org/etd/unlv/oai:oasis.library.unlv.edu:rtds-2433","repository":{"repo_id":"unlv","name":"University of Nevada - Las Vegas","base_url":"https://oasis.library.unlv.edu/do/oai/"},"display":{"title":"Thermochronology and geobarometry of the Granite Mountains, southeast California: Exhumation of a plutonic complex during collapse of the Sevier orogen","abstract":"Thermochronologic data and geobarometry from the Granite Mountains indicate exhumation of mid-crustal plutons during Late Cretaceous extensional tectonics. U/Pb zircon and 40Ar/39Ar ornblende ages indicate intrusion, crystallization, and geologically instantaneous cooling through 500°C at ∼75 Ma. K-feldspar multi-diffusion domain modeling indicates a cooling rate gradient from SW to NE of 63, 32, and 16°C/Ma for three samples spanning a transect across the range. NE K-feldspar cooled through ∼252°C by 73 Ma while other samples remained >375°C suggesting a short lived down-to-the-east normal faulting event at ∼75 to 74 Ma. Faster cooling rates with later initial K-feldspar recording (∼71 Ma) suggest extension continued along a shallow down-to-the-southwest detachment active from ∼73 to 69 Ma. U-Th/He apatite ages suggest the Late Cretaceous extensional event juxtaposed the deeper-seated Granite Mountains plutons with the shallow-level southern Providence Mountains plutons and the two cooled through 70°C as a single block.","abstract_html":"Thermochronologic data and geobarometry from the Granite Mountains indicate exhumation of mid-crustal plutons during Late Cretaceous extensional tectonics. U/Pb zircon and 40Ar/39Ar ornblende ages indicate intrusion, crystallization, and geologically instantaneous cooling through 500°C at ∼75 Ma. K-feldspar multi-diffusion domain modeling indicates a cooling rate gradient from SW to NE of 63, 32, and 16°C/Ma for three samples spanning a transect across the range. NE K-feldspar cooled through ∼252°C by 73 Ma while other samples remained >375°C suggesting a short lived down-to-the-east normal faulting event at ∼75 to 74 Ma. Faster cooling rates with later initial K-feldspar recording (∼71 Ma) suggest extension continued along a shallow down-to-the-southwest detachment active from ∼73 to 69 Ma. U-Th/He apatite ages suggest the Late Cretaceous extensional event juxtaposed the deeper-seated Granite Mountains plutons with the shallow-level southern Providence Mountains plutons and the two cooled through 70°C as a single block.","abstract_has_math":false,"creators":["Kula, Joseph Louis"],"institution":"University of Nevada, Las Vegas","degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Geoscience","degree_department":null,"school":null,"contributors":["Terry L. Spell"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2002,"date_issued":"2002-01-01T08:00:00Z","date_published":"2002-01-01T08:00:00Z","updated_at":"2026-07-24T05:25:33Z","subjects":[],"languages":["English"],"rights":["IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/"],"rights_urls":[],"identifier_entries":[{"key":"dc:identifier","label":"Identifier","values":["https://oasis.library.unlv.edu/rtds/1434"],"render_values":[{"text":"https://oasis.library.unlv.edu/rtds/1434","href":"https://oasis.library.unlv.edu/rtds/1434","code":true}]}]},"links":{"outbound_url":"https://doi.org/10.25669/oysz-kxx8","outbound_label":"DOI","outbound_source":"dc:identifier"},"metadata_groups":[{"id":"people","label":"People","entries":[{"key":"dc:contributor","label":"Contributor","values":["Terry L. 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NE K-feldspar cooled through ∼252°C by 73 Ma while other samples remained >375°C suggesting a short lived down-to-the-east normal faulting event at ∼75 to 74 Ma. Faster cooling rates with later initial K-feldspar recording (∼71 Ma) suggest extension continued along a shallow down-to-the-southwest detachment active from ∼73 to 69 Ma. U-Th/He apatite ages suggest the Late Cretaceous extensional event juxtaposed the deeper-seated Granite Mountains plutons with the shallow-level southern Providence Mountains plutons and the two cooled through 70°C as a single block."]},{"key":"dc:format","label":"Dc Format","values":["pdf"]},{"key":"dc:title","label":"Title","values":["Thermochronology and geobarometry of the Granite Mountains, southeast California: Exhumation of a plutonic complex during collapse of the Sevier orogen"]}]}],"canonical_facts":{"dc:contributor":["Terry L. Spell"],"dc:creator":["Kula, Joseph Louis"],"dc:description.abstract":["Thermochronologic data and geobarometry from the Granite Mountains indicate exhumation of mid-crustal plutons during Late Cretaceous extensional tectonics. U/Pb zircon and 40Ar/39Ar ornblende ages indicate intrusion, crystallization, and geologically instantaneous cooling through 500°C at ∼75 Ma. K-feldspar multi-diffusion domain modeling indicates a cooling rate gradient from SW to NE of 63, 32, and 16°C/Ma for three samples spanning a transect across the range. NE K-feldspar cooled through ∼252°C by 73 Ma while other samples remained >375°C suggesting a short lived down-to-the-east normal faulting event at ∼75 to 74 Ma. Faster cooling rates with later initial K-feldspar recording (∼71 Ma) suggest extension continued along a shallow down-to-the-southwest detachment active from ∼73 to 69 Ma. U-Th/He apatite ages suggest the Late Cretaceous extensional event juxtaposed the deeper-seated Granite Mountains plutons with the shallow-level southern Providence Mountains plutons and the two cooled through 70°C as a single block."],"dc:format":["pdf"],"dc:identifier":["10.25669/oysz-kxx8","https://oasis.library.unlv.edu/rtds/1434","https://oasis.library.unlv.edu/context/rtds/article/2433/viewcontent/uc.pdf"],"dc:language":["English"],"dc:publisher":["University of Nevada, Las Vegas"],"dc:rights":["IN COPYRIGHT. For more information about this rights statement, please visit http://rightsstatements.org/vocab/InC/1.0/"],"dc:title":["Thermochronology and geobarometry of the Granite Mountains, southeast California: Exhumation of a plutonic complex during collapse of the Sevier orogen"],"dc:type":["Text"],"thesis:degree_discipline":["Geoscience"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T05:25:33Z"}