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FIELD TRIP - CELEBRATING 100 YEARS OF THE OCGS


October 1st, 2021 8:00 AM - 5:00 PM

CELEBRATING 100 YEARS OF THE

OKLAHOMA CITY GEOLOGICAL SOCIETY

MOLLY TURKO, PhD

STRUCTURAL GEOLOGY EXPERT

FIELD TRIP

"STRUCTURAL GEOLOGY OF THE WICHITA UPLIFT"

September 10, 2021

8:00am to 5:00pm

 

 

Bio: Dr. Molly Turko has over 10 years of experience in the oil and gas industry and is a subject matter expert in structural geology. She has had the opportunity to work in multiple basins in the U.S including the Anadarko, Ardmore, Powder River, Appalachian, Onshore Gulf Coast, and Rocky Mountain Basins. She received both a B.Sc. (2009) and a M.Sc. (2011) in geology from the University of Tulsa followed by a Ph.D. (2019) from the University of Oklahoma where she studied under Dr. Shankar Mitra. Molly’s passion is mentoring and teaching, but her favorite role is leading structural geology field courses in Nevada and Southern Oklahoma. Molly is currently a team member of Applied Stratigraphix as their Structural Geology Expert along with consulting for Turko Tectonics and Structural Geology.

 

 

The Wichita Mountains in southwest Oklahoma are marked by a complex tectonic history filled with debate on the structural styles, evolution, and origin. During the Precambrian-Cambrian breakup of Rodinia, a failed rift tore through southern Oklahoma emplacing a Large Igneous Province. The rift then began to cool and subside as it became filled with sedimentary rocks dominated by thick carbonates. The region was relatively quiet until about the Late Mississippian through Pennsylvanian when the Pennsylvanian Orogeny uplifted the failed rift exposing the Wichita Mountains as seen today. Debates have pursued on the method of uplift, which include arguments for strike-slip, thrusting, and transpression. While much of the original rift geometry was masked by later deformation, it is also important to consider the impact of pre-existing structures on later Pennsylvanian deformation, which has largely been ignored when addressing these various structural styles observed in southern Oklahoma.

 

On this field trip we will discuss the complex tectonic history alongside the controversial structural styles of the region including the style of rifting, the driving mechanisms for uplift, and the various structures that developed. Participants will be able to recognize brittle shear zones in granite and interpret the slip direction (normal, reverse, or strike-slip faulting). We will also look at several structures that can help us differentiate between structures that originated during the rifting phase verse the Pennsylvanian Orogeny and what that can tell us about paleo-stress conditions. Discussions will include the expected structural styles based on stress/paleo-stress orientations and the impact of pre-existing structures on later deformation. The trip will include two moderate hikes along with a guidebook which includes a few additional hikes/stops to great structures in the Wichita Mountains.