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    Maps showing surface exposures of salty Lacustrine sediments in the Safford Basin, Graham County, Arizona

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    Author
    Harris, R.C.
    Issue Date
    2000-09-01
    Keywords
    Arizona Geological Survey Open File Reports
    Arizona
    Graham County
    Safford Basin
    geomorphology
    Geology
    evaporites
    playa sediments
    lacustrine sediments
    maps
    Basin and Range Province
    structural trough
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    Citation
    Harris, R.C., 2000, Maps showing surface exposures of salty Lacustrine sediments in the Safford Basin, Graham County, Arizona. Arizona Geological Survey Open File Report, OFR-00-10, 20 p.
    Description
    The Safford basin is a deep, sediment-filled structural trough containing abundant lacustrine (lake) and playa sediments, reflecting long periods of closed-basin conditions. Gravity models indicate that the Safford basin is up to 12,000 feet deep (Oppenheimer and Sumner, 1980; 1981). Soluble minerals such as halite (salt), carbonates, gypsum, and anhydrite are common in the basin-fill sediments (Marlowe, 1961; Harbour, 1966; Harris, 1997, 1999). These minerals commonly form by evaporation of water and deposits formed in this way are called evaporites. In this report, the singular word 'salt' refers to halite, whereas the plural 'salts' refers to any soluble evaporite mineral. Typical Basin-and-Range basins were formed in the late Tertiary (12-6 million years, Ma), when high-angle normal faulting dropped central blocks between uplifted bounding blocks, forming a more or less symmetrical, deep structural basin. The Safford basin, however, was formed earlier than Basin and Range time by low-angle faulting resulting from crustal extension. Detachment faulting during the mid-Tertiary (30-20 Ma) extension formed the metamorphic core complex of the Pinaleiio Mountains and the tilted structural basin of the Safford Valley (Spencer and Reynolds, 1989; Kruger and others, 1995). Later Basin and Range faulting did not affect the Safford region to the extent that it did other areas of the southwest. ( 9 pages)
    URI
    http://hdl.handle.net/10150/629816
    Additional Links
    https://library.azgs.arizona.edu/
    Language
    en
    Series/Report no.
    OFR-00-10
    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
    33.0915
    South Bounding Coordinate
    32.6394
    West Bounding Coordinate
    -110.006
    East Bounding Coordinate
    -109.039
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