A GIS APPROACH TO MAPPING FORMATIONAL CONTACTS IN THE WICHITA IGNEOUS PROVINCE

The Wichita Igneous Province (WIP) of southwestern Oklahoma has long been interpreted as an aulacogen, or a failed rift arm formed during the Cambrian. Igneous units in the WIP generally “dip” structurally to the south according to previous workers, but the map expression of the contacts is linear, suggesting steeply dipping contacts which may be fault- or intrusion-generated. This offering presents new contact mapping results based in ArcGIS Pro and confirmed in the field, intended to further delineate the structural and stratigraphic relationships between two significant units in the WIP, the Mount Scott Granite and Mt. Sheridan Gabbro. Pseudo-3D topographic profiles were extracted from the map and analyzed to show potential structural offset and/or intrusive geometries. Preliminary results suggest geometries of some intrusive contacts are inconsistent with their original configuration, and have been structurally modified. In some cases, local vertical relief in excess of 100 m may indicate the location of individual fault contacts.