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dc.contributor.authorBrand, P.K.
dc.contributor.authorStump, E.
dc.date.accessioned2018-11-10T01:02:52Z
dc.date.available2018-11-10T01:02:52Z
dc.date.issued2005-05-01
dc.identifier.citationBrand, P.K., and Stump, E., 2005, Tertiary Extension and Fault-Block Rotation in the Transition Zone, Cedar Mountains Area, Arizona v. 1.1: Arizona Geological Survey Contributed Map CM-11-A, map scale 1:24,000, 121 p. and 3 map sheets.
dc.identifier.urihttp://hdl.handle.net/10150/630633
dc.descriptionNew geologic mapping from the Cedar Mountains - Bloody Basin - Cooks Mesa area in the central Arizona Transition Zone presents an enigmatic geologic relationship that has previously gone unstudied. Here, fault blocks of Early Proterozoic basement overlain by Tertiary sedimentary and tuffaceous-lacustrine deposits and capped by a thick accumulation of basalt flows, dated in the project area between 15.1 and 13.5 Ma, are rotated ~20o west to west-southwest along east-dipping normal faults. Half-grabens formed during rotation are filled with a syn- to post-extensional basin-fill conglomerate, and are locally overlain by flat-lying and post-extensional basalts, dated in this study at 6.4 Ma. The extended area is a graben, bounded to the west by the eastern flank of Cooks Mesa, a flat-lying expression of the same general stratigraphy, and to the east by the Mazatzal Mountains. Faults in the project area strike north and northwest and are interpreted to merge with the Cooks Mesa fault, a listric normal fault, at depth. The graben, named in this study the Lower Verde Valley graben, continues southward out of the project area parallel to the Verde River, and northward across the Bloody Basin. New dates from this research bracket the timing of the extension in the project area between 13.5 Ma and 6.4 Ma. The timing is coeval with the Basin and Range disturbance in Arizona, yet the style of extension in the project area is not consistent with the published understanding of this event. Here, rather than the expected high-angle normal faults and offset without rotation, extension was accommodated by motion along a listric normal fault and rotation of fault blocks. This unusual setting provides a new view into the dynamics of the Basin and Range disturbance in the Arizona Transition Zone. Report and three map sheets - geologic map (1:24,000 map scale), cross-section sheet with 5 cross-sections, legend.
dc.language.isoen
dc.publisherArizona Geological Survey (Tucson, AZ)
dc.relation.ispartofseriesCM-11-A
dc.relation.urlhttps://library.azgs.arizona.edu/
dc.rightsArizona Geological Survey. All rights reserved.
dc.subjectArizona Geological Survey Contributed Maps
dc.subjectProterozoic
dc.subjectTertiary
dc.subjectPliocene
dc.subjectMiocene
dc.subjectQuaternary
dc.subjectChalk Canyon
dc.subjectRover Peak Quadrangle
dc.subjectLower Verde River
dc.subjectBloody Basin
dc.subjectLower Verde Valley Graben
dc.subjectMatzatzal Mountains
dc.subjectCooks Mesa
dc.subjectTransition Zone
dc.subjectCedar Mountains
dc.subjectChalk Canyon Formation
dc.subjectmetamorphic rocks
dc.subjectVerde River granite
dc.subjectgeomorphology
dc.subjectlandscape development
dc.subjectHickey Formation
dc.subjectBasin and Range disturbance
dc.subjectlistric nomral fault
dc.subjectconglomerate
dc.subjectbasin-fill
dc.subjectfaulting
dc.subjectsyn-depositional
dc.subjecthalf-graben
dc.subjectbasalt flows
dc.subjectlacustrine
dc.subjecttuffaceous
dc.titleTertiary Extension and Fault-Block Rotation in the Transition Zone, Cedar Mountains Area, Arizona v. 1.1
csdgm.bounding.west-111.875
csdgm.bounding.east-111.75
csdgm.bounding.north34.125
csdgm.bounding.south34
dc.description.noteOn 6 July 2011, v.1.1 was issued. The only change was to add Edmund Stump as co-author.
dc.description.collectioninformationDocuments in the AZGS Document 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.
refterms.dateFOA2018-11-10T01:02:52Z


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