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Thermochemical remanent magnetization in Jurassic silicic volcanics from Nevada, U.S.A.

dc.contributor.authorGeissman, John W.en_US
dc.contributor.authorVan der Voo, Roben_US
dc.date.accessioned2006-04-07T17:23:40Z
dc.date.available2006-04-07T17:23:40Z
dc.date.issued1980-07en_US
dc.identifier.citationGeissman, J. W., Van der Voo, R. (1980/07)."Thermochemical remanent magnetization in Jurassic silicic volcanics from Nevada, U.S.A.." Earth and Planetary Science Letters 48(2): 385-396. <http://hdl.handle.net/2027.42/23211>en_US
dc.identifier.urihttp://www.sciencedirect.com/science/article/B6V61-473M7NM-3J/2/a9e1aee9a0cbfa352efc8d4ff4df7653en_US
dc.identifier.urihttps://hdl.handle.net/2027.42/23211
dc.description.abstractCharacteristic magnetizations from Middle Jurassic dacitic to andesitic subaerial volcanics (the Fulstone and Artesia Formations) in the Buckskin Mountain Range, western central Basin and Range Province, are well-grouped, generally display univectorial decays to the origin in demagnetization and have hematite blocking temperatures restricted almost entirely to above 620[deg]C. Petrographic, rock magnetic and electron microprobe investigations confirm that nearly pure hematite is the essential magnetic phase (up to about 10 vol. %) occurring as a replacement of coarse titaniferous magnetite phenocrysts and fine groundmass particles, as a secondary alteration product of ferromagnesian phenocrysts and as a mobilized phase filling cracks and other open spaces. The presence of antipodal directions in each flow unit and in interbedded volcanoclastic units (some having retained magnetite as a major magnetic phase) and magnetite-dominated remanences in time-equivalent intrusives cutting the flows indicates that the volcanics acquired their hematite remanence, a faithful record of the geomagnetic field, in high-temperature, deuteric oxidation during and following their emplacement, not during a later thermal event such as regional metamorphism. The remanence is probably a thermochemical remanent magnetization, although part may be of thermoremanent origin.en_US
dc.format.extent885783 bytes
dc.format.extent3118 bytes
dc.format.mimetypeapplication/pdf
dc.format.mimetypetext/plain
dc.language.isoen_US
dc.publisherElsevieren_US
dc.titleThermochemical remanent magnetization in Jurassic silicic volcanics from Nevada, U.S.A.en_US
dc.typeArticleen_US
dc.rights.robotsIndexNoFollowen_US
dc.subject.hlbsecondlevelGeology and Earth Sciencesen_US
dc.subject.hlbtoplevelScienceen_US
dc.description.peerreviewedPeer Revieweden_US
dc.contributor.affiliationumDepartment of Geology, University of Toronto, Toronto, Ont. M5S 1A1, Canada; Department of Geological Sciences, University of Michigan, Ann Arbor, MI 48109, U.S.A.en_US
dc.contributor.affiliationumDepartment of Geological Sciences, University of Michigan, Ann Arbor, MI 48109, U.S.A.en_US
dc.description.bitstreamurlhttp://deepblue.lib.umich.edu/bitstream/2027.42/23211/1/0000140.pdfen_US
dc.identifier.doihttp://dx.doi.org/10.1016/0012-821X(80)90203-4en_US
dc.identifier.sourceEarth and Planetary Science Lettersen_US
dc.owningcollnameInterdisciplinary and Peer-Reviewed


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