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    Geologic map of the Happy Valley 7 ½' Quadrangle, Cochise and Pima Counties, Arizona v.2

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    DGM-89 HappyValley Text_v.1.pdf
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    DGM-89 Report(PDF)
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    Author
    Spencer, J.E.
    Lingrey, S.H.
    Johnson, B.J.
    Cook, J.P.
    Richard, S.M.
    Issue Date
    2019
    Keywords
    Arizona Geological Survey Digital Geologic Maps
    Proterozoic
    Mesozoic
    Paleozoic
    Cambrian
    Devonian
    Mississippian
    Permian
    cretaceous
    Pleistocene
    Tertiary
    Quaternary
    Holocene
    Soza Canyon
    Wildhorse Mountain
    Mica Mountain
    Tucson
    Rincon Mountains
    Happy Valley
    tectonite
    granodiorite
    Pioneer shale
    Bolsa Quartzite
    Abrigo Formation
    Martin Formation
    Escabrosa Limestone
    Horquilla Limestone
    Earp Formation
    Granite Gneiss
    Epitaph Formation
    Concha Limestone
    Bisbee Group
    Fanglomerate
    rock chemistry
    Wildhorse Mountain thrust
    mylonites
    San Pedro Detachment Fault
    structural geology
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    Citation
    Spencer, J.E., Lingrey, S.H., Johnson, B.J., Cook, J.P., and Richard, S.M., 2011, Geologic map of the Happy Valley 7.5’ Quadrangle, Cochise and Pima Counties, Arizona: Arizona Geological Survey Digital Geologic Map DGM-89, version 1.0, map scale 1:24,000, 7 p. and 1 map plate.
    Description
    Previous studies (Drewes, 1974; Lingrey, 1982), as well as this study, included measurements of various foliations and lineations in the penetratively deformed rocks of the eastern Rincon Mountains (see also Davis, 1980). All resulting data were compiled into a Microsoft Excel spreadsheet and plotted on equal-area, lower hemisphere stereonets using GEOrient graphing and statistical analysis software developed by Rod Holcombe. San Pedro detachment fault. Mylonitic foliation and lineation are associated with the San Pedro detachment fault only near the western edge of the Happy Valley 7 ½' Quadrangle. This is interpreted as a consequence of an east-to-west increase in paleodepth and corresponding paleotemperature during initial extensional shearing along the San Pedro detachment fault and its down-dip continuation as a mylonitic shear zone. Foliation and lineation measurements (n=10 and 11, respectively; Fig. 1A) indicate early extension oriented 4° 075°. However, restoration of presumed regional eastward tilting associated with isostatic rebound of the fault footwall during Oligo-Miocene tectonic exhumation (e.g., Spencer, 1984) would result in gentle westward rather than eastward plunge for the lineations at the time of mylonitic shearing.
    URI
    http://hdl.handle.net/10150/629181
    Additional Links
    https://library.azgs.arizona.edu/item/ADGM-1567626614127-620
    Language
    en
    Series/Report no.
    DGM-89, v. 2.0
    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
    32.25
    South Bounding Coordinate
    32.15
    West Bounding Coordinate
    -110.5
    East Bounding Coordinate
    -110.375
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