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Mecca Hills’ Painted Canyon

Join us for a field trip to Mecca Hills where we will study the structural geology of deformed sedimentary and basement rocks within the San Andreas Fault zone. Camping and mapping exercises included!

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Mecca Hills’ Painted Canyon

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  1. GLG455/598 Advanced Field Geology Mecca Hills’ Painted Canyon Structural geology of deformed sedimentary and basement rocks within the San Andreas Fault zone

  2. View southeast over the Mecca Hills

  3. Mecca Hills

  4. Painted Canyon

  5. Tent camping on the beach: $7/night x 2 camps =$28/11 people ~ $3 each ????

  6. Forecast from weather.com Logistics • Depart Fwing loading dock at 4 pm on Friday. • Return early evening on Sunday night • Bring camping gear and field gear • We will provide kitchen system • Organize food groups (if desired) and purchase items before Friday

  7. Nominal mapping area: transect 6.2 km long

  8. Mapping exercise: Produce a geologic map along this transect which is mostly perpendicular to the major structures. -Many strike and dips of faults and bedding plotted on the map -Major stratigraphic contacts and basement contacts -Rock descriptions

  9. Generalized stratigraphy in the Mecca Hills Basement: Highly sheared gneiss and granite of the Chuckawalla complex; Orocopia Schist

  10. Unconformity or fault along Box Canyon

  11. Nice folds and faults in Painted Canyon

  12. Sedimentary structures in Plio-Pleistocene units

  13. Some basement rocks are involved in the deformation

  14. Structural planes • See handouts and a couple of movies • See also Reynolds’ web sites: • http://geology.asu.edu/%7Esreynolds/blocks/0_start_here.htm • http://geology.asu.edu/%7Esreynolds/apparent_dip/apparent_dip_gallery.htm

  15. Davis and Reynolds, 2000

  16. Ragan and Arrowsmith, 2002

  17. Ragan and Arrowsmith, 2002

  18. Ragan and Arrowsmith, 2002

  19. Strike and dip notation • Azimuthal • Quadrant • Dip/dip direction

  20. Measuring strike and dip Ragan and Arrowsmith, 2002

  21. Ragan and Arrowsmith, 2002

  22. Davis and Reynolds, 2000

  23. Davis and Reynolds, 2000

  24. Davis and Reynolds, 2000

  25. Ragan and Arrowsmith, 2002

  26. Davis and Reynolds, 2000

  27. Basic steps in the preparation of a geologic cross section: • Choose appropriate line of section • Produce topographic profile along it. • Transfer marker attitudes (contacts and within units) • Correct for apparent dip in line of section (if line <75 degrees from strike) • Draw units; maintain stratigraphic thickness where possible; use deformation patterns observed from field to guide interpretation. Continue lines into air and below ground Davis and Reynolds, 2000

  28. Ragan and Arrowsmith, 2002 Davis and Reynolds, 2000

  29. Davis and Reynolds, 2000

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