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The Heterogeneity of Paleocavern Systems Developed Along Syndepositional Fault Zones: The Upper Permian Capitan Platform, Guadalupe Mountains, U.S.A

By
Eduard KoŠA
Eduard KoŠA
Department Of Earth Sciences, The University Of Manchester, Oxford Road, Manchester M13 9Pl, Uk Present Address: Shell U.K. Exploration And Production, 1 Altens Farm Road, Nigg, Aberdeen Ab12 3Fy, Uk
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Hunt David
Hunt David
Department Of Earth Sciences, The University Of Manchester, Oxford Road, Manchester M13 9Pl, Uk Present Address: Norsk Hydro, Sandsliveien 90, Sandsli N-5049, Norway
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Fitchen William M.
Fitchen William M.
Occidental Permian Services, Inc., 580 Westlake Park Blvd., Houston, Texas 77079, U.S.A.
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Bockel-Rebelle Marie-Odile
Bockel-Rebelle Marie-Odile
Totalfinaelf, Exploration And Production, 64018 Pau-Cedex, France
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Roberts Gerald
Roberts Gerald
Birkbeck College, The University Of London, Gower Street, London WC1E 6BT, UK
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Published:
January 01, 2003

Abstract

The results are presented from an integrated sedimentologic, structural, stratigraphic, and diagenetic study of syndepositional faults and fractures that cut the Permian Capitan reef and equivalent platform strata within three outcrop windows in Slaughter Canyon, Guadalupe Mountains, New Mexico. The studied faults are dip slip, have displacement of up to 30 m parallel the shelf margin, and are vertically and laterally segmented. The faults dip steeply shelfward and basinward, and grew incrementally during deposition of the Yates and Tansill Formations. Steep polycyclic paleocavern systems developed along faults and fractures. These can have cumulative vertical relief of more than 270 m, extend at least 1.2 km along strike, and are typically less than 10 m wide but can attain a width of 90 m. The paleocaverns can extend more than 110 m below the top of the Capitan reef.

The paleocaverns are filled mainly with sediments deposited during Capitan progradation and aggradation. Seven Permian lithologies are distinguished: (1) limestones and limestone breccias, (2) microspar-lithified breccias, (3) carbonate-rich breccias, (4) reworked and remnant breccias, (5) beige dolomitic siltstone-sandstone and associated breccias, (6) pink dolomitic siltstone-sandstone and associated breccias, and (7) spar-cemented breccias. The fills vary vertically and along strike within the paleocaverns but have a clear organization and stratigraphy. The integration of the stratigraphy of the paleocaverns with the structural and sequence stratigraphic framework developed in back-reef strata provides evidence for incremental fault growth and multiple episodes of dissolution, brecciation, collapse, deposition, cementation, and dolomitization within the paleocaverns during Capitan times.

Solution-modified syndepositional faults extend at least 33 km along strike from Slaughter Canyon and are considered to be an integral component of the Capitan platform. The fault-zone paleocaverns contain a unique internal record of events and processes that have no counterpart in the shelf succession. Their study provides new insights into the internal heterogeneity and diagenesis of the Capitan platform. The results have important implications for the Capitan platform, and more generally for the heterogeneity of syndepositional fracture-controlled karst systems formed in carbonate platforms with steep unstable margins, subject to compaction-induced tilting and/ or developed in active tectonic settings.

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Contents

SEPM Special Publication

Permo-Carboniferous Carbonate Platforms and Reefs

Wayne M. Ahr
Wayne M. Ahr
Department of Geology and Geophysics, Texas A&M University, College Station, Texas 77843-3115, U.S.A.
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Paul M. (Mitch) Harris
Paul M. (Mitch) Harris
ChevronTexaco E&P Technology Company, 6001 Bollinger Canyon Road, San Ramon, California 94583-0746, U.S.A.
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William A. Morgan
William A. Morgan
ConocoPhillips, Inc., P.O. Box 2197, Houston, Texas 77252-2197, U.S.A.
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Ian D. Somerville
Ian D. Somerville
Department of Geology, University College - Dublin, Belfield, Dublin 4, Ireland
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SEPM Society for Sedimentary Geology
Volume
78
ISBN electronic:
9781565763340
Publication date:
January 01, 2003

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