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    Geometry and Construction History of the Copper Ridge Laccolith, Mount Ellen, Henry Mountains, Utah

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    Author
    Maurer, Elizabeth Anna
    Abstract
    The Copper Ridge laccolith is an asymmetric tongue-shaped intrusion located on the southeastern margin of Mount Ellen in the Henry Mountains, Utah. The late-Oligocene to early-Miocene igneous rocks have no syn- or post-emplacement tectonic overprint. In addition, exposure of the laccolith is exceptional: well-preserved sedimentary strata cap the intrusion, the lower contact is locally exposed, and numerous natural cross sections can be studied. These characteristics make the Copper Ridge laccolith an ideal location to study emplacement of magma in the shallow crust. Field mapping shows the intrusion is about 3.5 km wide, 2.0 km long and, at its thickest point, 425 m thick. The estimated magma volume is about 2.9 km³. Field work, crystal size distribution, and geochemistry, suggest that the intrusion was built incrementally through the injection of two separate magma batches, resulting in an upper and a lower sheet. Field work shows that the upper sheet is separated from the lower sheet by well-preserved, variably metamorphosed Cretaceous Tununk shale. Data from anisotropy of magnetic susceptibility analysis suggest a subhorizontal sill fed the intrusion from the west-northwest, and magma flowed to the southeast in a fanning pattern. X-ray diffraction data show that the preserved Tununk experienced low-grade contact metamorphism. Multiple data sets suggest a construction model in which the upper sheet intruded first, lifting and deforming the sedimentary strata. The lower sheet intruded second and off center relative to the upper sheet. The asymmetric lifting caused the upper sheet to fracture adjacent to the southern margin of the lower sheet. The fractures likely facilitated weathering and erosion, causing the upper sheet to appear segmented in current exposure.
    URI
    http://hdl.handle.net/10342/5020
    Subject
    Geology
    Date
    2015
    Citation:
    APA:
    Maurer, Elizabeth Anna. (January 2015). Geometry and Construction History of the Copper Ridge Laccolith, Mount Ellen, Henry Mountains, Utah (Master's Thesis, East Carolina University). Retrieved from the Scholarship. (http://hdl.handle.net/10342/5020.)

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    MLA:
    Maurer, Elizabeth Anna. Geometry and Construction History of the Copper Ridge Laccolith, Mount Ellen, Henry Mountains, Utah. Master's Thesis. East Carolina University, January 2015. The Scholarship. http://hdl.handle.net/10342/5020. October 03, 2023.
    Chicago:
    Maurer, Elizabeth Anna, “Geometry and Construction History of the Copper Ridge Laccolith, Mount Ellen, Henry Mountains, Utah” (Master's Thesis., East Carolina University, January 2015).
    AMA:
    Maurer, Elizabeth Anna. Geometry and Construction History of the Copper Ridge Laccolith, Mount Ellen, Henry Mountains, Utah [Master's Thesis]. Greenville, NC: East Carolina University; January 2015.
    Collections
    • Geological Sciences
    • Master's Theses
    Publisher
    East Carolina University

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