Oceanographic restriction and deposition of the Permian Park City and Phosphoria formations, northeastern Utah and western Wyoming

Conference · Fri Mar 01 00:00:00 EST 1991 · AAPG Bulletin (American Association of Petroleum Geologists); (United States)

OSTI ID:7259530

Whalen, M T ^[1]

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1. Syracuse Univ., NY (United States)

Detailed lithofacies analyses of the Permian Park City Formation, in northeastern Utah and western Wyoming, reveal that it was deposited in both open and restricted continental shelf and slope environments bordering the Oquirrh and Sublett basins. The Park City and the intercalated Phosphoria Formation document the interplay between carbonate, clastic, evaporite, and organic-rich sedimentation, fluctuating sea-level and bottom water oxygenated, and oceanic upwelling. New data from the Park City and Phosphoria formations imply that paleoceanographic models for the deposition of these units must be revised. Both physical and chemical restriction, resulting from paleogeographic constraints, regressive conditions, and the decay of organic matter produced in nutrient-rich upwelled waters, were important to the development of lithofacies patterns. Evidence of restriction includes massive and bedded anhydrite deposits and calcite replaced anhydrite nodules, carbonate facies with low levels of bioturbation and significant quantities of authigenic pyrite, and laminated black, organic-rich shales indicating low oxygen conditions. Park City and Phosphoria lithofacies imply that upwelling began during regression that resulted from a glacio-eustatic drop in sea level. This was accompanied by a greater pole-to-equator temperature gradient and intensified atmospheric circulation that induced eastern ocean basin upwelling. Physical and chemical restriction of marginal Permian basins was important in the development of dysaerobic to anaerobic conditions that facilitated the preservation of organic matter.

• OSTI ID: 7259530
• Report Number(s): CONF-910403-; CODEN: AABUD
• Journal Information: AAPG Bulletin (American Association of Petroleum Geologists); (United States), Vol. 75:3; Conference: Annual meeting of the American Association of Petroleum Geologists (AAPG), Dallas, TX (United States), 7-10 Apr 1991; ISSN 0149-1423
• Country of Publication: United States
• Language: English

Related Subjects

58 GEOSCIENCES
CARBONATE ROCKS
DEPOSITION
GEOCHEMISTRY
EVAPORITES
WYOMING
GEOLOGIC FORMATIONS
ANAEROBIC CONDITIONS
GEOLOGIC HISTORY
GEOLOGIC MODELS
ORGANIC MATTER
PERMIAN PERIOD
SEA LEVEL
CHEMISTRY
DEVELOPED COUNTRIES
FEDERAL REGION VIII
GEOLOGIC AGES
LEVELS
MATTER
NORTH AMERICA
PALEOZOIC ERA
ROCKS
SEDIMENTARY ROCKS
USA
580000* - Geosciences