"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.
Wronkiewicz, David J.
Hogan, John Patrick
Geosciences and Geological and Petroleum Engineering
M.S. in Geology and Geophysics
Missouri University of Science and Technology
ix, 148 pages
© Xiaowei Peng
Thesis - Open Access
Library of Congress Subject Headings
Geography -- China
Sandstone -- China
Geology, Stratigraphic -- Permian
Sedimentation and deposition -- China
Electronic OCLC #
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.