Geology of the Mormon Flat Dam Quadrangle, Maricopa County, Arizona v. 2.0

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Author
Ferguson, C.A.
Gilbert, W.G.
Issue Date
2022
Keywords
Arizona Geological Survey Open File Reports
Mormon Flat Dam
Maricopa County
Arizona
quadrangle
dam
hydrology
Geology
Miocene
Middle Tertiary

Metadata
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Citation
Ferguson, C.A. and Gilbert, W.G., 1997, Geology of the Mormon Flat Dam Quadrangle, Maricopa County, Arizona. Arizona Geological Survey Open File Report, OFR-97-14, 3 map sheets, map scale 1:24,000, 28 p.
Publisher
Arizona Geological Survey (Tucson, AZ)
Description
The geology of the Mormon Flat Dam Quadrangle is dominated by a thick succession of Miocene volcanic rocks, and by the consequences of two important structural events: 1) formation of the Superstition Cauldron at approximately 18.6 Ma (McIntosh, personal communication, Ferguson and others, in preparation), and 2) regional extension which was active for a short period of time directly before, during, and after eruption of the Apache Leap Tuff. The Tertiary stratigraphy consists of three broadly defined sequences: 1) pre-cauldron lavas, 2) syn-cauldron units - chiefly Apache Leap Tuff, and 3) post-cauldron lavas, intrusions and volcaniclastic sedimentary rocks. Regional extensional tectonism was active over a broad area south of the Salt River Canyon during formation of the pre-cauldron lava field (between approximately 20.5 Ma and 18.6 Ma), and then for a short time after cauldron formation, along a narrower zone along the Salt River. Areas lying to the north of Salt River remained relatively stable and unextended throughout the history of the volcanic field. Report and geology of the Mormon Flat Dam Quadrangle, Maricopa County, Arizona, three sheets, scale 1:24,000.
URI
http://hdl.handle.net/10150/630776
Additional Links
https://library.azgs.arizona.edu/item/ADGM-1669152454032-487
Language
en
Series/Report no.
OFR-97-14
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
33.6832
South Bounding Coordinate
33.4498
West Bounding Coordinate
-111.632
East Bounding Coordinate
-111.335
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