자료유형  

 학위논문

Control Number  

0015492765

International Standard Book Number  

9781088335307

Dewey Decimal Classification Number  

560

Main Entry-Personal Name  

Li, Zhiyang.

Publication, Distribution, etc. (Imprint  

[Sl] : Indiana University, 2019

Publication, Distribution, etc. (Imprint  

Ann Arbor : ProQuest Dissertations & Theses, 2019

Physical Description  

257 p

General Note  

Source: Dissertations Abstracts International, Volume: 81-04, Section: A.

General Note  

Advisor: Schieber, Juergen.

Dissertation Note  

Thesis (Ph.D.)--Indiana University, 2019.

Restrictions on Access Note  

This item must not be sold to any third party vendors.

Summary, Etc.  

요약A 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.

Subject Added Entry-Topical Term  

Geology

Subject Added Entry-Topical Term  

Sedimentary geology

Subject Added Entry-Topical Term  

American studies

Subject Added Entry-Topical Term  

Paleontology

Added Entry-Corporate Name  

Indiana University Geological Sciences

Host Item Entry  

Dissertations Abstracts International. 81-04A.

Host Item Entry  

Dissertation Abstract International

Electronic Location and Access  

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Control Number  

joongbu:569985