Doctoral Dissertations
Abstract
"The Permian-Triassic period represents a significant but insufficiently understood tectonic transition stage in the southern Central Asian Orogenic Belt (CAOB) between the Paleozoic continental amalgamation and Cenozoic orogenic reactivation. This study integrates fieldwork, petrographic, and detrital zircon geochronological data to document the trend of depositional environments, framework grain compositions, and dates of detrital zircon grains of the uppermost Carboniferous–Lower Triassic sandstones from three study areas in Bogda Mountains, the greater Turpan-Junggar basin, NW China, to decipher the spatial and temporal changes in the provenance lithology and area and reconstruct the unroofing history of the southern CAOB.
In the first part of this work, the compositions of 229 sandstones are investigated; and four principal petrofacies are defined using three parameters including volcanic, sedimentary, and metamorphic (with polycrystalline quartz) lithics. In the second part of this work, the detrital zircon geochronological dates of 35 sandstones are obtained. Compositional and detrital zircon data reveal that provenance lithology, tectonic setting, and area have changed spatially and temporally. The North Tianshan arc was a persistent source, and the Central Tianshan became the source during Guadalupian and thereafter, related to the closure of the Paleo-Asian Ocean and following continental collisions. The study favors that the lateral accretion of terranes was an important mechanism for the continental growth in the CAOB and improves our understanding of the tectonic evolution of southern CAOB. The reconstruction will shed light on the assembly of Pangea, the most recent supercontinent, which greatly influenced the evolution of life"-- Abstract, p. iv
Advisor(s)
Yang, Wan
Committee Member(s)
Crowley, James
Gao, Stephen S.
Locmelis, Marek
Hogan, John Patrick
Wronkiewicz, David J.
Department(s)
Geosciences and Geological and Petroleum Engineering
Degree Name
Ph. D. in Geology and Geophysics
Publisher
Missouri University of Science and Technology
Publication Date
Spring 2025
Pagination
xv, 514 pages
Note about bibliography
Includes_bibliographical_references_(pages 512-513)
Rights
©2023 Sixuan Wu , All Rights Reserved
Document Type
Dissertation - Open Access
File Type
text
Language
English
Thesis Number
T 12491
Recommended Citation
Wu, Sixuan, "Provenance of the Uppermost Carboniferous–Lower Triassic Sandstones, Bogda Mountains, Nw China: Implications on the Late Paleozoic Tectonic History of the Southern Central Asian Orogenic Belt" (2025). Doctoral Dissertations. 3390.
https://scholarsmine.mst.edu/doctoral_dissertations/3390
