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Folds analysis techniques

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Folds analysis techniques

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    1. Folds analysis techniques

    2. 1. p-axes and ß-axes Define fold axis using measurements of bedding from around the fold Plot on stereonet

    4. Finding p-axes

    6. Find a fold axis using these bedding measurements 050°, 80°-SE 350°, 44°-NE 088°, 72°-NW Use both p-axis and ß-axis methods

    7. 2. Refolded folds

    8. Refolded folds recognition Can often be found in outcrop Regional patterns in facing direction Interference patterns

    10. Steps to interpret maps Draw two lines representing fold axes. Which one is refolded? Identify pattern of younger and older rocks. e.g. youngest on outside Is the hook/boomerang shape a syncline or anticline? Decide what kind of fold refolded the first fold.

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