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Trezevant Rice MS Thesis.pdf (10.54 MB)

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Sedimentology and Stratigraphy of Super-Critical Sediment Gravity Flow Deposits Within the Upper Cretaceous Mancos Shale, Eastern Utah

Rice, Trezevant Adair
http://orcid.org/0009-0002-4139-7502
http://rave.ohiolink.edu/etdc/view?acc_num=miami1682036054930747

Abstract Details

2023, Master of Science, Miami University, Geology and Environmental Earth Science.
The Mancos Shale is a marine stratigraphic unit deposited in the Western Interior Seaway during Late Cretaceous time (~80 Ma). While dominated by offshore shale/siltstone deposits, anomalous sand-rich intervals within the Aberdeen and Kenilworth Members of the Mancos have been a subject of study since the 1970s. Since then, multiple interpretations of the depositional environments/origins for these sand-dominated deposits have been hypothesized with no interpretation able to completely explain these deposits. However, recent flume work and hydrodynamic studies suggest that sedimentary structures like those in the Mancos can be generated by the bedforms of sub- and supercritical turbidity currents below storm wave base. A detailed sedimentological study performed at Hatch Mesa revealed the prevalence of sedimentary structures, bedforms, and macroforms indicative of both sub-and supercritical turbidity flows. Facies analysis detailed supercritical deposits of short and long wavelength antidunes and chute and pool structures. In addition, outcrop photographs and point-cloud models created utilizing UAV-assisted photogrammetry show macroforms with large-scale wave-form features occurring and terminating perpendicular, parallel, and oblique to paleoflow. This combination of small-scale facies analysis with large scale geometry is characteristic of deposition within the channel-lobe transition zone of a submarine fan, below storm wave base differing from previous interpretations.
Brian Currie (Advisor)
Michael Brudzinski (Committee Member)
Jason Rech (Committee Member)
77 p.
Geology
supercritical flow; sedimentary structures; bedforms; Mancos shale; Utah; Aberdeen; Kenilworth; turbidites; submarine fan; channel-lobe transition zone; chute and pool structures; antidunes

Recommended Citations

Citations

  • Rice, T. A. (2023). Sedimentology and Stratigraphy of Super-Critical Sediment Gravity Flow Deposits Within the Upper Cretaceous Mancos Shale, Eastern Utah [Master's thesis, Miami University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=miami1682036054930747

    APA Style (7th edition)

  • Rice, Trezevant. Sedimentology and Stratigraphy of Super-Critical Sediment Gravity Flow Deposits Within the Upper Cretaceous Mancos Shale, Eastern Utah. 2023. Miami University, Master's thesis. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=miami1682036054930747.

    MLA Style (8th edition)

  • Rice, Trezevant. "Sedimentology and Stratigraphy of Super-Critical Sediment Gravity Flow Deposits Within the Upper Cretaceous Mancos Shale, Eastern Utah." Master's thesis, Miami University, 2023. http://rave.ohiolink.edu/etdc/view?acc_num=miami1682036054930747

    Chicago Manual of Style (17th edition)

miami1682036054930747
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© 2023, all rights reserved.
This open access ETD is published by Miami University and OhioLINK.