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The Upper Smackover Formation (Jurassic) of the Paup Spur-Mandeville Fields, Miller County, Arkansas – a Study of Upward-Shoaling Carbonate Sand Deposition

By
Maryann M. Mc Graw
Maryann M. Mc Graw
Department of Geological Sciences, University of Texas, Austin, Texas 78712
1
Present Address: 6558 East Cooper Street, Tucson, AZ 85710
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Published:
January 01, 1984

Abstract

Cores of the Upper Smackover Formation from Paup Spur-Mandeville Fields, Miller County, Arkansas, reveal shallow subtidal to intertidal lithofacies and a general vertical sequence suggesting decreasing water depth through time. The uppermost portion of the lower Smackover is a laminated pelsparite with shaly partings, interpreted as a low-energy-subtidal deposit. Overlying subtidal deposits of the upper Smackover consist of laterally adjacent cross-bedded and burrowed pelsparite-pelmicrite as well as laminated to burrowed silty pelsparite with shaly partings, representing current-sorted coarser material and some reworking in protected areas. These sediments are capped by intertidal algal biolithite and pelsparite or cross-bedded oosparite. The geometry of the Smackover carbonate sand body present in the area is the result of bottom topography and current-wave direction. The highest-energy facies are aligned southwest-northeast, perpendicular to the long axis of a prominent embayment and partly surrounding pre-Smackover structural highs.

Several phases of diagenesis occurred during the post-depositional history of the upper Smackover in Paup Spur-Mandeville Fields: (1) sea-floor, (2) near-surface meteoric with an important dissolution event and (3) burial. Most original interparticle porosity is now cement filled. Porosity distribution coincides mainly with facies and grain types, because secondary porosity is determined by the original mineralogy of the grains.

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Contents

SEPM Core Workshop Notes

Carbonate Sands-A Core Workshop

Paul M. Harris
Paul M. Harris
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SEPM Society for Sedimentary Geology
Volume
5
ISBN electronic:
9781565762602
Publication date:
January 01, 1984

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