Structures with significant lateral displacement are difficult to recognise using common sub-surface geophysical tools. Most interpretations under these structural settings require a sound kinematic understanding of the processes involved. This field seminar will cover both theoretical aspects and field examples of expected geometry associated with basin formation and inversion along strike-slip fault zones (commonly referred to as "wrench" fault zones).
Among the few areas where one can clearly observe the results of basin forming processes and inversion in a strike-slip fault zone is along a segment of the San Andreas Fault in southern California. Spectacular, easily accessible exposures provide a unique 3-dimensional perspective of various structures that form under this tectonic setting. The first part of the trip covers examples of tectonic-controlled sedimentation along the western margin of the basin where Neogene marine sandstones, non-marine fluvial and alluvial fan deposits, and mass flow deposits with associated folds are exposed. In the second leg of the trip, structures along strike-slip and convergent strike-slip faults including en echelon and partitioned folds, be-headed canyons, shutter ridges and deflected streams, triangle zones and Palm Tree structures, will be studied. In addition, fault zone rocks and their possible sealing or leaking nature will be discussed based on exposures along the San Andreas Fault.
This field seminar will greatly benefit both geologists and geophysicists by providing an interpretative guide and a field analogue to various prospects located along oblique fault zones.
For more information contact:
Petrel Robertson Consulting Ltd.
500, 736- 8th Avenue S.W.
Phone: (403) 218-1618
Fax: (403) 262-9135