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

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Author
Rhys-Evans, Gwyn
Issue Date
2007
Keywords
Arizona Geological Survey Contributed Reports
Arizona
Bloody Basin
mineral
Transition Zone
map
Geology

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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.
Publisher
Arizona Geological Survey (Tucson, AZ)
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.
URI
http://hdl.handle.net/10150/630843
Additional Links
https://library.azgs.arizona.edu/item/AGCR-1552429939266-502
Language
en
Series/Report no.
CR-07-B
Rights
Arizona Geological Survey. All rights reserved.
Collection Information
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.
North Bounding Coordinate
35.1199
South Bounding Coordinate
32.25
West Bounding Coordinate
-113.071
East Bounding Coordinate
-109.534
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