Provenance and depositional environments of fluvial-lacustrine sandstones of lower Permian Lucaogou low-order cycle, Bogda mountains, NW China

Author

Xiaowei Peng

Abstract

"Compositional and textural maturity of sandstones may reflect provenance lithology and sediment transport distance, which are useful for paleogeographic reconstruction. 37 sandstones in six outcrop stratigraphic sections in Tarlong-Taodonggou and Zhaobishan areas in the greater Turpan-Junggar rift basin were studied to investigate the fluvial-lacustrine sandstone provenance in lower Permian Lucaogou (LCG) low-order cycle, Bogda Mountains, NW China. 400 points were counted in each thin section. All the samples are classified into lithic arenites, subarenites, wackes, and mudrocks. Three Petrofacies are defined. Petrofacies A is characterized by a high lithic content which is dominantly basaltic lithics with minor sedimentary lithics and felsic volcanic lithics with mean compositions of Q₃F₁₁L₈₆, Qm₂F₁₂Lt₈₆, Qp₁Ls₇Lv₉₂, and Qm₁₅P₈₄K₁ from four ternary classifications, respectively. Petrofacies B has a relatively high content of sedimentary lithics indicating a sedimentary source in the local rift shoulders with mean compositions of Q₃F₅L₉₂, Qm₃F₈Lt₈₉, Qp₁Ls₃₆Lv₆₃, and Qm₂₃P₇₁K₆. Petrofacies C has a higher content of felsic volcanic lithics with mean compositions of Q₃F₈L₈₉, Qm₄F₉Lt₈₇, Qp₁Ls₁₀Lv₈₉, and Qm₃₃P₆₃K₄. Tectonic setting is interpreted from ternary diagrams. All the samples fall in the recycled orogen and magmatic arc fields. Two sources, northern Tian Shan and rift shoulders, are differentiated on the basis of grain size and roundness. In Tarlong-Taodonggou area, similar trends of textural and compositional properties are present in N and NW Tarlong, and S Tarlong and Taodonggou indicating similar depositional history. SW Tarlong shows a unique trend due to the local sedimentary source. In Zhaobishan, the trend is highly variable, indicating episodic sediments influx from rift shoulders or a different catchment basin"--Abstract, page iii.

Advisor(s)

Yang, Wan

Committee Member(s)

Wronkiewicz, David J.
Hogan, John Patrick

Department(s)

Geosciences and Geological and Petroleum Engineering

Degree Name

M.S. in Geology and Geophysics

Publisher

Missouri University of Science and Technology

Publication Date

Fall 2016

Pagination

ix, 148 pages

Note about bibliography

Includes bibliographical references (pages 144-147).

Geographic Coverage

China

Time Period

Permian

Rights

© 2016 Xiaowei Peng

Document Type

Thesis - Open Access

File Type

text

Language

English

Subject Headings

Geography -- China
Sandstone -- China
Geology, Stratigraphic -- Permian
Sedimentation and deposition -- China

Thesis Number

T 11049

Electronic OCLC #

974715914

Recommended Citation

Peng, Xiaowei, "Provenance and depositional environments of fluvial-lacustrine sandstones of lower Permian Lucaogou low-order cycle, Bogda mountains, NW China" (2016). Masters Theses. 7615.
https://scholarsmine.mst.edu/masters_theses/7615