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Depositional Environments and Diagenesis of the Tensleep Sandstone, Eastern Big Horn Basin, Wyoming

By
David Mankiewicz
David Mankiewicz
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James R. Steidtmann
James R. Steidtmann
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Published:
January 01, 1979

Abstract

Study of lithologies and sedimentary structures in seven surface sections and five cores indicates that the Tensleep Sandstone in the eastern Big Horn Basin was deposited in a coastal environment. The lower part of the Tensleep formed in a siliciclastic sabkha whereas the upper part represents deposition in a coastal eolian dune complex. Previous paleomagnetic and paleowind studies by others indicate that during deposition of the Tensleep Sandstone, the area lay in a trade wind belt, a setting similar to many of the major coastal sabkhas today.

Diagenesis of the Tensleep Sandstone was a function of both depositional environment and tectonic history. Early cements (anhydrite and dolomite) were, for the most part, related to the chemistry of subsurface waters in the sabkha and associated environments. However, later pre- and post-hydrocarbon entrapment cements (quartz and feldspar overgrowths and rhombic dolomite) appear to be related to episodes of tectonism (Jurassic arching and Laramide folding and faulting). Analyses of surface and subsurface waters show that calcite cement presently is stable at the surface and in the subsurface to the south. To the north, anhydrite is now stable in the subsurface.

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Contents

SEPM Special Publication

Aspects of Diagenesis

Peter A. Scholle
Peter A. Scholle
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Paul R. Schluger
Paul R. Schluger
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SEPM Society for Sedimentary Geology
Volume
26
ISBN electronic:
9781565761568
Publication date:
January 01, 1979

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