Development of the Mississippian Carbonate Platform in Southern Nevada and Eastern California on the Eastern Margin of the Antler Foreland Basin
Published:January 01, 1995
Calvin H. Stevens, Darrell Klingman, Paul Belasky, 1995. "Development of the Mississippian Carbonate Platform in Southern Nevada and Eastern California on the Eastern Margin of the Antler Foreland Basin", Stratigraphic Evolution of Foreland Basins, Steven L. Dorobek, Gerald M. Ross
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Development of the Mississippian carbonate platform along the eastern margin of the foreland basin of the Antler Orogen was controlled by subsidence due primarily to emplacement of the Roberts Mountains allochthon, but also to variable rates of carbonate production and eustatic sea-level changes. A series of stratigraphic sections in southern Nevada and eastern California, oriented approximately perpendicular to the original depositional trends, has allowed evaluation of the relative influence of these controlling factors and development of a depositional model that may have wide application.
Mississippian carbonate-platform sedimentation began with a rapid transgression in Kinderhookian time, probably due to a sea-level rise and perhaps initial thrust loading of the older Devonian carbonate platform. In early Osagean time, final emplacement of the Roberts Mountains allochthon onto sialic North America depressed the platform, greatly reducing carbonate production. By middle Osagean time, carbonate production rates exceeded the rate of formation of accommodation space, initiating northwestward progradation of a shallow-water carbonate platform. Continued progradation produced relatively steep, unstable slopes, and by early Meramecian time a rimmed platform with coral buildups had formed. These changes in platform morphology are recorded in base-of-slope deposits where slope-derived submarine slides are overlain by sediment-gravity-flow deposits containing debris derived from the platform margin. Carbonate deposition ceased in early Meramecian time when an eustatic sea-level fall exposed the entire platform.
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Stratigraphic Evolution of Foreland Basins
Stratigraphic Evolution of Foreland Basins - A strong case can be made that foreland basins are where the casual links between sedimentation and tectonic events were first recognized, as evidenced by the interpretations of geologists working in classic foreland areas. This Special Publication was derived from a Research Symposium entitled ?Stratigraphic Sequences in Foreland Basins ?held at the AAPG-SEPM joint annual meeting on June, 1992, in Calgary, Alberta, Canada. This volume provides a well-balanced perspective of current research on foreland basin stratigraphy and also serves as another element in the evolving framework that comprises our understanding of foreland basins. Given that so many of earth?s resources are found in foreland basins and that foreland basin strata often provide the only preserved record of the tectonic events that led to basin development, the impetus for continued studies of foreland basin strata should remain for many generations of geologists to come.