Geology of the Bloody Basin: Central Arizona’s Transition Zone

Rhys-Evans, Gwyn

dc.contributor.author	Rhys-Evans, Gwyn
dc.date.accessioned	2018-11-10T03:00:13Z
dc.date.available	2018-11-10T03:00:13Z
dc.date.issued	2007
dc.identifier.citation	Rhys-Evans, Gwyn, 2007, Geology of the Bloody Basin: Central Arizona’s Transition Zone: Arizona Geological Survey Contributed Report CR-07-B, map scale 1:24,000, 132 p. and 1 map sheet.
dc.identifier.uri	http://hdl.handle.net/10150/630843
dc.description	New geologic mapping in the Bloody Basin of central Arizona’s Transition Zone reveals two distinct sets of normal faults that have a nearly 90° orientation with respect to one another. Miocene Hickey basalt unconformably overlies the Verde River granite that together makes a sequence of rocks that has been dissected into a series of tilted fault blocks. Regionally anomalous, northeast-striking normal faulting resulted in a synthetic array of half-grabens that are locally filled with a volcaniclastic conglomerate grading into a granite-rich conglomerate. These northeast-striking faults are thought to be influenced by a preexisting Precambrian structure that has been defined by aeromagnetic studies as the Holbrook lineament. This lineament projects directly through the Bloody Basin and would explain, at least in part, the origin of these anomalously oriented faults. Following this northwest-southeast directed extension, a dominant northeast-southwest extension direction resulted in a more regionally pervasive pattern of northwest-striking normal faults, including the Verde fault that cross-cuts the previously formed set. The least principal stress direction required for development of these extensional features is that which currently exists within the Colorado Plateau, northeast-southwest directed. The resultant thinned upper crust due to this extension gave way to the emplacement of a suite of mafic dikes that intruded basin-filling material shed during the first tectonic event.
dc.language.iso	en
dc.publisher	Arizona Geological Survey (Tucson, AZ)
dc.relation.ispartofseries	CR-07-B
dc.relation.url	https://library.azgs.arizona.edu/item/AGCR-1552429939266-502
dc.rights	Arizona Geological Survey. All rights reserved.
dc.subject	Arizona Geological Survey Contributed Reports
dc.subject	Arizona
dc.subject	Bloody Basin
dc.subject	mineral
dc.subject	Transition Zone
dc.subject	map
dc.subject	Geology
dc.title	Geology of the Bloody Basin: Central Arizona’s Transition Zone
csdgm.bounding.west	-113.071
csdgm.bounding.east	-109.534
csdgm.bounding.north	35.1199
csdgm.bounding.south	32.25
dc.description.note	A fresh cover added to the original AZGS product on 1/13/2015.
dc.description.collectioninformation	Documents 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.dateFOA	2018-11-10T03:00:13Z