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An Integrated Sedimentologic, Petrographic, and Stratigraphic Analysis of the Upper Cretaceous Tununk Shale Member of the Mancos Shale Formation, South-Central Utah, USA
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| 자료유형 | 학위논문 |
|---|---|
| 서명/저자사항 | An Integrated Sedimentologic, Petrographic, and Stratigraphic Analysis of the Upper Cretaceous Tununk Shale Member of the Mancos Shale Formation, South-Central Utah, USA. |
| 개인저자 | Li, Zhiyang. |
| 단체저자명 | Indiana University. Geological Sciences. |
| 발행사항 | [S.l.]: Indiana University., 2019. |
| 발행사항 | Ann Arbor: ProQuest Dissertations & Theses, 2019. |
| 형태사항 | 257 p. |
| 기본자료 저록 | Dissertations Abstracts International 81-04A. Dissertation Abstract International |
| ISBN | 9781088335307 |
| 학위논문주기 | Thesis (Ph.D.)--Indiana University, 2019. |
| 일반주기 |
Source: Dissertations Abstracts International, Volume: 81-04, Section: A.
Advisor: Schieber, Juergen. |
| 이용제한사항 | This item must not be sold to any third party vendors. |
| 요약 | A multi-proxy (sedimentology, petrography, and stratigraphy) analytical approach is applied to the Upper Cretaceous Tununk Shale Member of the Mancos Shale in south-central Utah. The primary objectives of this study are three-fold: 1) to examine the sedimentary facies characteristics and variations, 2) to characterize the petrographic composition and texture, and 3) to determine how facies variability can be incorporated into a sequence stratigraphic framework in this thick (~200 m) mudstone-dominated succession. The Tununk Shale is interpreted as an offshore mud blanket deposited on a storm-dominated shelf. Vertical variations in sedimentary facies characteristics indicate that the depositional environments of the Tununk Shale shifted laterally from a distal middle-shelf to outer-shelf, then from an outer-shelf to inner-shelf environment during the second-order Greenhorn transgressive-regressive sea level cycle. Integrated with paleocurrent data and paleogeography, storm-induced shore-parallel geostrophic flows and offshore-directed flows likely were the dominant processes that governed the transport and deposition of mud across and along this storm-dominated shelf.In the context of the depositional setting, detailed petrographic studies indicate that most mud in the Tununk system were transported in bedload as silt- to sand-size mud-dominated composite particles (MCPs), rather than specific clay-size components. Three important types of MCPs in the Tununk Shale include fecal pellets, altered volcanic rock fragments, and shale lithics. Two other types of MCPs, namely floccules and soft mud rip-up clasts, likely contributed significantly to the formation of the precursor mud "matrix" of the Tununk Shale. Due to their water-rich nature, however, they can be discerned in the rock record only under fortunate circumstances, and instead form what most would consider the fine-grained ''matrix."At least 49 parasequences can be identified within the Tununk Shale. Each parasequence shows coarsening-upward trend via upward increases in silt and sand content, thickness and lateral continuity of lamina/beds, and abundance of storm-generated sedimentary structures. Based on parasequence stacking patterns, 11 system tracts, four depositional sequences, and key sequence stratigraphic surfaces can be identified. The high-resolution sequence stratigraphic framework of the Tununk Shale reveals a hierarchy of stratal cyclicity, which is interpreted to be produced by the interplay of tectonic, eustatic, and climatic cycles. |
| 일반주제명 | Geology. Sedimentary geology. American studies. Paleontology. |
| 언어 | 영어 |
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