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dc.contributor.authorSchwing, J.
dc.date.accessioned2021-09-13T17:09:22Z
dc.date.available2021-09-13T17:09:22Z
dc.date.issued2021
dc.identifier.citationSchwing, J., 2021, Magnetostratigraphy of the Pre-Colorado Integration Lost Cabin Beds, Cottonwood, Valley, Arizona. Arizona Geological Survey Contributed Report CR-21-B, 109 p.en_US
dc.identifier.urihttp://hdl.handle.net/10150/661646
dc.descriptionABSTRACT. The Miocene Lost Cabin beds of Cottonwood Valley, Arizona, represent a north-northeasterly fine-grained axial valley basin deposit fed by sediments from the Newberry and Black Mountains to the west and east, respectively. Cottonwood Valley formed within the Colorado River corridor during a period of volcanism and north moving E-W extension spanning the early to middle Miocene. This study uses magnetostratigraphy, rock magnetism, and 40Ar/39Ar dating from detrital sanidine to determine the timing of deposition of the Lost Cabin beds in relation to the arrival of Colorado River sediments. One hundred and seventy samples were used in this study from a total of thirty-nine sites. Magnetite and hematite are identified as predominate carriers of magnetic remanence, with minor contributions from titanomagnetite, titanomaghemite, and pyrrhotite. Rock magnetic measurements were consistent with identifying magnetizations that are held in magnetite and hematite. Normal and reverse polarities yielded a total of three geomagnetic polarity intervals within the Lost Cabin bed sediments. 40Ar/39Ar dating yielded one site with a young sanidine grain that produced an age of 5.49 ± 0.788 Ma. Magnetostratigraphy was correlated to the geomagnetic polarity timescale by using three ash beds with dates that spanned from 5.59 ± 0.05 Ma to 5.35 ± 0.07 Ma. Polarity intervals were identified as Subchrons C3r, and C3n.4n (Thvera), within the Gilbert Chron. Results from this study suggest a post 5.235 Ma arrival date of the Colorado River waters within Cottonwood Valley.en_US
dc.language.isoenen_US
dc.publisherArizona Geological Survey (Tucson, AZ)en_US
dc.relation.ispartofseriesCR-21-Ben_US
dc.relation.urlhttp://repository.azgs.az.gov/uri_gin/azgs/dlio/1978en_US
dc.rightsArizona Geological Survey. All rights reserved.en_US
dc.subjectBouse Formationen_US
dc.subjectColorado Riveren_US
dc.subjectLost Cabin bedsen_US
dc.subjectmagnetostratigraphyen_US
dc.subjectproto-Colorado Riveren_US
dc.subjectArizona-Californiaen_US
dc.subjectCottonwood Valleyen_US
dc.subjectLake Mohaveen_US
dc.subjectLower Colorado Riveren_US
dc.subjectMioceneen_US
dc.titleMagnetostratigraphy of the Pre-Colorado Integration Lost Cabin Beds, Cottonwood, Valley, Arizonaen_US
dc.contributor.departmentArizona Geological Surveyen_US
csdgm.bounding.west-114.599en_US
csdgm.bounding.east-114.55en_US
csdgm.bounding.north35.36en_US
csdgm.bounding.south35.2978en_US
dc.description.noteOriginally released as, Schwing, J. 2019, Magnetostratigraphy of the Pre-Colorado Integration Lost Cabin Beds, Cottonwood, Valley, Arizona, [Unpubl. M.S. Thesis]. University of Oklahomaen_US
dc.description.collectioninformationDocuments in the AZGS Documents Repository collection are made available by the Arizona Geological Survey (AZGS) and the University Libraries at the University of Arizona. For more information about items in this collection, please contact azgs-info@email.arizona.edu.en_US
refterms.dateFOA2021-09-13T17:09:23Z


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