Doctoral Dissertations

Dongyu Zheng

Keywords and Phrases

Bogda Mountains; Depositional environments; Eastern North Tianshan Suture; NW China; Provenance; Wutonggou

Abstract

"This work integrates petrographic and fieldwork studies and documents the spatial and temporal distributions of compositions and textures of the upper Permian-lowermost Triassic fluvial-lacustrine sandstones, Wutonggou low-order cycle (WTG LC), Bogda Mountains, NW China. In the first part, three petrofacies are identified on the basis of the relative abundances of quartz, feldspar, and lithics and conglomerate compositions and paleocurrent directions are documented. These data indicate that rocks of the eastern North Tianshan Suture (ENTS) and rift shoulders were the provenance lithology. Moreover, the upsection changes of petrofacies and conglomerate compositions suggest that the lithology of ENTS changed. During approximately Wuchiapingian, the eastern part of ENTS included the subduction complex, whereas the western part contained the undissected volcanic arc. During approximately Changhsingian to early Induan, the eastern part of ENTS was dominated with the transitional volcanic arc and subordinate with the subduction complex, whereas the subduction complex was exposed in the western part of ENTS. The second part documents the textural characteristics of the sandstones of WTG LC. Textures of different petrofacies are different in grain size, sorting, roundness, and textural maturity, indicating provenance is a major control factor in sandstone textures. Moreover, each petrofacies is subdivided into littoral/beach, deltaic, and fluvial sedimentary facies, of which the textural characteristics are similar. This work improves our understanding of the nature and the unroofing history of ENTS and factors in controlling compositions and textures of fluvial-lacustrine sandstones"--Abstract, page iv.

Advisor(s)

Yang, Wan

Committee Member(s)

Hogan, John Patrick
Wronkiewicz, David J.
Eckert, Andreas
Obrist-Farner, Jonathan
Wan, Mingli

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

Ph. D. in Geology and Geophysics

Sponsor(s)

Missouri University of Science and Technology. Department of Geology and Geophysics. Dr. Alfred Spreng Undergraduate Research Award

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2019

Journal article titles appearing in thesis/dissertation

  • Provenance of upper Permian-lowermost Triassic sandstones, Wutonggou low-order cycle, Bogda Mountains, NW China: Implications on the unroofing history of the Eastern North Tianshan Suture
  • Textural characteristics and their controlling processes of upper Permian-lowermost Triassic sandstones, Wutonggou low-order cycle, Bogda Mountains, NW China

Pagination

xi, 171 pages

Note about bibliography

Includes bibliographic references.

Geographic Coverage

Bogda Mountains, NW China

Rights

© 2019 Dongyu Zheng, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 11568

Electronic OCLC #

1105154941

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Dissertation Location

 
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