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Granitic Plutonism and Metamorphism, Eastern Alaska Range, Alaska
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1975
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Historical GeographyEngineeringGeomorphologyEarth ScienceRegional GeologySocial SciencesGeological DataEastern Alaska RangeNeotectonicsGeological EngineeringGeographyGeologyEngineering GeologyTectonicsStructural GeologyGranitic PlutonismExploration GeologyEconomic GeologyEarth SciencesMetamorphismGsa Bulletin 1975
Research Article| June 01, 1975 Granitic Plutonism and Metamorphism, Eastern Alaska Range, Alaska DONALD H. RICHTER; DONALD H. RICHTER 1U.S. Geological Survey, 1209 Orca Street, Anchorage, Alaska 99501 Search for other works by this author on: GSW Google Scholar MARVIN A. LANPHERE; MARVIN A. LANPHERE 2U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 Search for other works by this author on: GSW Google Scholar NEAL A. MATSON, JR. NEAL A. MATSON, JR. 1U.S. Geological Survey, 1209 Orca Street, Anchorage, Alaska 99501 Search for other works by this author on: GSW Google Scholar Author and Article Information DONALD H. RICHTER 1U.S. Geological Survey, 1209 Orca Street, Anchorage, Alaska 99501 MARVIN A. LANPHERE 2U.S. Geological Survey, 345 Middlefield Road, Menlo Park, California 94025 NEAL A. MATSON, JR. 1U.S. Geological Survey, 1209 Orca Street, Anchorage, Alaska 99501 Publisher: Geological Society of America First Online: 01 Jun 2017 Online ISSN: 1943-2674 Print ISSN: 0016-7606 Geological Society of America GSA Bulletin (1975) 86 (6): 819–829. https://doi.org/10.1130/0016-7606(1975)86<819:GPAMEA>2.0.CO;2 Article history First Online: 01 Jun 2017 Cite View This Citation Add to Citation Manager Share Icon Share Facebook Twitter LinkedIn Email Permissions Search Site Citation DONALD H. RICHTER, MARVIN A. LANPHERE, NEAL A. MATSON; Granitic Plutonism and Metamorphism, Eastern Alaska Range, Alaska. GSA Bulletin 1975;; 86 (6): 819–829. doi: https://doi.org/10.1130/0016-7606(1975)86<819:GPAMEA>2.0.CO;2 Download citation file: Ris (Zotero) Refmanager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex toolbar search Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentBy SocietyGSA Bulletin Search Advanced Search Abstract Plutonic rocks in the eastern Alaska Range were emplaced in Late Pennsylvanian time (282 to 285 m.y. B.P.) and during two distinct intervals in Cretaceous time (105 to 117 and 89 to 94 m.y. B.P.) Development of a large plutonic-metamorphic complex, consisting of diorite and quartz diorite intimately associated with banded gneiss and other metamorphic rocks, apparently occurred during Late Triassic to Middle Jurassic time (163 to 199 m.y. B.P.). A smaller plutonic-metamorphic complex is Miocene in age (17 m.y.).The younger Cretaceous plutons are recognized only in the regionally metamorphosed Devonian and older terrane north of the Denali fault. Plutons of the older Cretaceous and Pennsylvanian events are restricted to Pennsylvanian and younger terrane south of the Denali fault and are associated with coeval volcanic rock assemblages. The major plutonic-metamorphic complex is also restricted to the terrane south of the Denali fault and may relate to collapse of an upper Paleozoic volcanic arc in Triassic time followed by syntectonic magmatism in Jurassic time. The Miocene plutonic-metamorphic complex may reflect the time of initial movement along the Denali fault.Porphyry copper deposits are associated with the Cretaceous plutons south of the Denali fault. The source of the copper may be subjacent copper-rich basalt flows (Nikolai Greenstone) of Triassic age. First Page Preview Close Modal You do not have access to this content, please speak to your institutional administrator if you feel you should have access.