{"id":{"repo_id":"unlv","oai_identifier":"oai:oasis.library.unlv.edu:rtds-2170"},"canonical_url":"https://search.dev.ndltd.org/etd/unlv/oai:oasis.library.unlv.edu:rtds-2170","repository":{"repo_id":"unlv","name":"University of Nevada - Las Vegas","base_url":"https://oasis.library.unlv.edu/do/oai/"},"display":{"title":"Petrogenetic study of the Porcupine Lake mafic intrusive complex, Trinity terrane, northern California","abstract":"The Early Devonian (404 +/- 3 Ma) Porcupine Lake mafic intrusive complex of the Trinity terrane consists primarily of ultramafic-mafic plutonic and dike lithologies. The plutonic rock forms steep intrusive contacts with adjacent Ordovician peridotite, and consists of basal layered peridotite, cumulate clinopyroxenite, and isotropic gabbro. East-west trending mafic-to-felsic aphanitic dikes intrude the plutonic rocks, with high dike concentrations (>80%) in the southern portion of the complex; Gabbro and mafic dikes display subduction-related enrichment of light-ion lithophile elements and high degrees of depletion of high-field strength elements (Nb, Ta ≅ 0.1 NMORB). Trace element mixing models indicate gabbro and mafic dikes are derived from a residual mantle source with enrichment by small amounts of slab-derived aqueous fluids and pelagic sediments. Mafic dikes are also enriched by fertile MORB (asthenospheric) mantle. Subduction zone enrichment of a depleted mantle source suggests the Porcupine Lake mafic intrusive complex formed in a forearc tectonic setting.","abstract_html":"The Early Devonian (404 +/- 3 Ma) Porcupine Lake mafic intrusive complex of the Trinity terrane consists primarily of ultramafic-mafic plutonic and dike lithologies. The plutonic rock forms steep intrusive contacts with adjacent Ordovician peridotite, and consists of basal layered peridotite, cumulate clinopyroxenite, and isotropic gabbro. East-west trending mafic-to-felsic aphanitic dikes intrude the plutonic rocks, with high dike concentrations (>80%) in the southern portion of the complex; Gabbro and mafic dikes display subduction-related enrichment of light-ion lithophile elements and high degrees of depletion of high-field strength elements (Nb, Ta ≅ 0.1 NMORB). Trace element mixing models indicate gabbro and mafic dikes are derived from a residual mantle source with enrichment by small amounts of slab-derived aqueous fluids and pelagic sediments. Mafic dikes are also enriched by fertile MORB (asthenospheric) mantle. Subduction zone enrichment of a depleted mantle source suggests the Porcupine Lake mafic intrusive complex formed in a forearc tectonic setting.","abstract_has_math":false,"creators":["Muller, Edward Robert"],"institution":"University of Nevada, Las Vegas","degree_name":"Master of Science (MS)","degree_level":"Thesis","degree_discipline":"Geoscience","degree_department":null,"school":null,"contributors":["Rodney V. Metcalf"],"advisors":[],"committee_chairs":[],"committee_members":[],"year":2000,"date_issued":"2000-01-01T08:00:00Z","date_published":"2000-01-01T08:00:00Z","updated_at":"2026-07-24T05:25:11Z","subjects":[],"languages":["English"],"rights":["IN COPYRIGHT. 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East-west trending mafic-to-felsic aphanitic dikes intrude the plutonic rocks, with high dike concentrations (>80%) in the southern portion of the complex; Gabbro and mafic dikes display subduction-related enrichment of light-ion lithophile elements and high degrees of depletion of high-field strength elements (Nb, Ta ≅ 0.1 NMORB). Trace element mixing models indicate gabbro and mafic dikes are derived from a residual mantle source with enrichment by small amounts of slab-derived aqueous fluids and pelagic sediments. Mafic dikes are also enriched by fertile MORB (asthenospheric) mantle. Subduction zone enrichment of a depleted mantle source suggests the Porcupine Lake mafic intrusive complex formed in a forearc tectonic setting."]},{"key":"dc:format","label":"Dc Format","values":["pdf"]},{"key":"dc:title","label":"Title","values":["Petrogenetic study of the Porcupine Lake mafic intrusive complex, Trinity terrane, northern California"]}]}],"canonical_facts":{"dc:contributor":["Rodney V. Metcalf"],"dc:creator":["Muller, Edward Robert"],"dc:description.abstract":["The Early Devonian (404 +/- 3 Ma) Porcupine Lake mafic intrusive complex of the Trinity terrane consists primarily of ultramafic-mafic plutonic and dike lithologies. The plutonic rock forms steep intrusive contacts with adjacent Ordovician peridotite, and consists of basal layered peridotite, cumulate clinopyroxenite, and isotropic gabbro. East-west trending mafic-to-felsic aphanitic dikes intrude the plutonic rocks, with high dike concentrations (>80%) in the southern portion of the complex; Gabbro and mafic dikes display subduction-related enrichment of light-ion lithophile elements and high degrees of depletion of high-field strength elements (Nb, Ta ≅ 0.1 NMORB). Trace element mixing models indicate gabbro and mafic dikes are derived from a residual mantle source with enrichment by small amounts of slab-derived aqueous fluids and pelagic sediments. Mafic dikes are also enriched by fertile MORB (asthenospheric) mantle. Subduction zone enrichment of a depleted mantle source suggests the Porcupine Lake mafic intrusive complex formed in a forearc tectonic setting."],"dc:format":["pdf"],"dc:identifier":["10.25669/tnq4-ppc2","https://oasis.library.unlv.edu/rtds/1171","https://oasis.library.unlv.edu/context/rtds/article/2170/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":["Petrogenetic study of the Porcupine Lake mafic intrusive complex, Trinity terrane, northern California"],"dc:type":["Text"],"thesis:degree_discipline":["Geoscience"],"thesis:degree_level":["Thesis"],"thesis:degree_name":["Master of Science (MS)"]},"updated_at":"2026-07-24T05:25:11Z"}