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The AAPG/Datapages Combined Publications Database

Kansas Geological Society

Abstract


Flysch Facies and Structure of the Ouachita Mountains: Guidebook, 29th Field Conference, 1966
Pages 112-124

Petrology and Provenance of Sandstones of the Stanley Group (Mississippian), Southern Ouachita Mountains, Oklahoma

J. Gilmore Hill

Abstract

One hundred nine thin sections of Stanley sandstones and siltstones were examined petrographically. The Stanley sandstones were found to be quartz wackes, feldspathic wackes, arkosic wackes, quartz arenites, and feldspathic arenites. Texturally most are very fine sand or coarse silt size. Sorting is poor to very poor with matrix content averaging 18 percent. No systematic textural variations suggesting direction to source were noted. Mineralogic analyses indicated that some quartz was derived from pre-existing sediments and some from metaquartzites and possibly other metamorphics. Most of the quartz has no provenance significance. Plagioclase feldspar (An26 to An40) in the sandstones is identical to plagioclase in the Stanley tuffs and may have come from the same volcanic source. Rock fragments are rare but the bulk of those found are metamorphics (schists, slates, phyllites) and andesitic (?) volcanic fragments. It is concluded that the Stanley source area was a complex terrain of metamorphic (metasediments), volcanic, and sedimentary rocks. It was probably an orogenic island system formed within the Ouachita geosyncline south of the present day Ouachita Mountains. The similarity of metamorphic and volcanic lithologies of Paleozoic age in the subsurface along the Luling overthrust front in Texas to the rock fragments in the Stanley sandstones suggests that this now buried sequence was a part of the Stanley source area.


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