242 Crustal Petrology, Part I

This session explores various igneous and metamorphic processes that have shaped Earth’s crust. We welcome contributions from the micro- to macroscale, from the deep to shallow crust, and from field- to laboratory- to modeling-based.

Wednesday, 22 October 2025
8:00 AM - 12:00 PM
HBGCC, 216AB

Early Insights Into The Wichita Igneous Province Using Legacy Collections From The Oklahoma Geological Survey

Paper number: 242-4
Program: Technical Sessions
Time: 8:50 AM – 9:05 AM

Authors

Abstract

The Wichita Igneous Province (WIP) is a large igneous province in southwestern Oklahoma, consisting of a bimodal suite of igneous rocks that were emplaced during the rifting of the Southern Oklahoma Aulacogen (SOA) in the late Ediacaran and early Cambrian. Historically, the Oklahoma Geological Survey (OGS) has periodically researched the natural resources and geological processes of the SOA. Recently, new critical mineral initiatives and grants have reignited interest in the WIP, and the Wichita Mountains remain a key focus area for the OGS. With new and legacy datasets from collections housed at the OGS Core Repository (Oklahoma Petroleum Information Center (OPIC)), we present early insights into the igneous rocks of the WIP, with a specific focus on the Glen Mountain Layered Complex (GMLC). For this study, we have incorporated two primary datasets, including legacy data (thin sections, core descriptions, and geochemical datasets) from the Roger Cooper Collection at OGS, and new sampling from five cores drilled in 1988. The five cores make up the OGS Glen Mountain Core Collection and contain a variety of lithologies (granite, gabbro, diabase) and textures (cumulates, aplites, pegmatites), as well as features of igneous processes such as layering, and magma mixing and mingling. We pair this with new petrological descriptions and newly collected geochemical data from in-house analytical facilities, including portable x-ray fluorescence (pXRF), scanning electron microscopy (SEM), x-ray diffraction (XRD), and electron microprobe analyzer (EPMA) to enhance our understanding of igneous processes and mineral systems of the WIP. 

Geological Society of America Abstracts with Programs. Vol. 57, No. 6

doi: 10.1130/abs/2025AM-414305

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