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    Natural fracturing in carbonate rocks as a function of lithology and structural position in a detachment fold: examples from the northeastern Brooks Range, Alaska

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    Author
    Brinton, Joseph S.
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    URI
    http://hdl.handle.net/11122/6277
    Abstract
    Fractures in detachment folded Mississippian-Pennsylvania Lisburne Group carbonates provide insight into the distribution and character of natural fractures as a function of folding and lithology. Data from five detachment folds suggest that hinges show a higher fracture density than limbs. This study also suggests that the amount of shortening does not play a significant role in determining fracture density or uniformity of fracture orientation. A mechanical classification based on lithologic homogeneity reflects natural fracture distribution as a function of lithology more accurately than conventional lithologic classifications. Two main fracture sets were observed, a N-S set, perpendicular to fold axes, and an E-W set, parallel to fold axes. Statistical analyses suggest that E-W fracturing occurred before and during folding and that N-S fracturing occurred both before and after folding.
    Description
    Thesis (M.S.) University of Alaska Fairbanks, 2002
    Date
    2002-08
    Type
    Thesis
    Collections
    Older Theses Not Clearly Affiliated with a Current College
    Theses (Geosciences)

    entitlement

     
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