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    The Geology and Mid-Mesozoic Tectonics of the Northern Canelo Hills, Santa Cruz County, Arizona - Geologic Maps

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    Author
    Kluth, C.F.
    Issue Date
    2015-11-25
    Keywords
    Arizona Geological Survey Contributed Maps
    Cambrian
    Devonian
    Mississippian
    Pennslyvanian
    Permian
    Jurassic
    cretaceous
    Tertiary
    Quaternary
    Santa Cruza County
    Basin and Range Province
    northern Canelo Hills
    Canelo Hills
    structural geology
    Mount Hughes Formation
    lithotectonic
    Laramide
    Paleomagnetic
    volcanics
    tuff
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    Citation
    Kluth, C.F., 1981, The Geology and Mid-Mesozoic Tectonics of the Northern Canelo Hills, Santa Cruz County, Arizona - Geologic Maps. Arizona Geological Survey Contributed Map CM-15-B, 2 map sheets at scale 1:24,000, 2 plates: location map for measured section, measured sections.
    Publisher
    Arizona Geological Survey (Tucson, AZ)
    Description
    The Jurassic rocks in the northern Canelo Hills can be grouped into four stratigraphic units (in chronological order): 1) red mudstones, 2) a sandstone and conglomerate unit, 3) a sequence of welded ash flow tuffs, and 4) a coarse conglomerate unit. The clastic units contain large exotic blocks of Paleozoic rocks. These rocks have been referred to as the "lower" Canelo Hills volcanics, but map relationships indicate that they were deposited on top of the "upper" Canelo Hills volcanics. Therefore the old nomenclature should be abandoned and the "lower" Canelo Hills volcanics is herein renamed the Mount Hughes formation. The Rb-Sr isotopic age for welded tuffs within the Mount Hughes formation determined for this study is l50.5 ± 2.5 m.y. This age is concordant with published dates (K-Ar, Rb-Sr) from correlative rocks elsewhere in the Canelo Hills. Paleomagnetic data suggest that two reversals are present in the sequence with a pole position of lambdap = 62.2°N, phi(p) = 130.3°E, with d(p) = 4.1° and dm = 7.4°. This pole suggests an episode of rapid apparent polar wander for North America during the Middle to Late Jurassic. The northern Canelo Hills are comprised of a structurally-high, fault-bounded, central-block of Paleozoic and Jurassic rocks that are folded into a faulted, northwest-trending anticline. Structurally lower blocks of deformed Cretaceous rocks bound the high central-block on the southwest and northeast across reverse faults. The large structures in the northern Canelo Hills reflect southwest-northeast Laramide shortening. A few northeast-striking faults are Jurassic in age. The revision of the stratigraphy within the northern Canelo Hills requires revision of the mid-Mesozoic stratigraphic framework for southeastern Arizona. The new framework has two lithotectonic units: a lower, volcanic sequence and an upper, coarse clastic unit. The present work suggests the following tectonic history of southeastern Arizona. A Triassic (?) to late Jurassic continental volcanic arc was deposited on Paleozoic marine shelf rocks. A coarse clastic sequence that reflects continental rifting was deposited in the Late Jurassic to Early Cretaceous over the arc terrane. Shallow seas transgressed the area in Late Early Cretaceous. Laramide compression affected the area in Late Cretaceous.
    URI
    http://hdl.handle.net/10150/630728
    Additional Links
    http://repository.azgs.az.gov/uri_gin/azgs/dlio/1657
    Language
    en
    Series/Report no.
    CM-15-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
    31.6566
    South Bounding Coordinate
    31.5425
    West Bounding Coordinate
    -110.715
    East Bounding Coordinate
    -110.593
    Collections
    AZGS Document Repository

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