Doctoral Dissertations


Xin Zhan

Keywords and Phrases

Biomarkers; Lacustrine deposits; Lithofacies; Permian; Stable organic carbon isotope


"The overall objective of this study is to understand physical and chemical responses of Earth Systems to environmental and climatic perturbations of diverse magnitudes and time scales in Bogda Mountains, NE Pangea. Field investigations, petrographic observations, and geochemical analyses have been used to interpret paleoenvironment and paleoclimate in cm-m-scale high-order cycles (HCs: 0.1-100 kyrs), low-order cycles (LCs: 1-10 Myr), and critical events of late Paleozoic ice age (LPIA: 320-260 Myr ago). Four organo-facies are one-to-one correlated with the four lithofacies in the meter-scale HCs, suggesting litho- and organo-facies are genetically linked and fundamentally controlled by environmental changes associated with lake contraction and extension. The coincidence of climatic changes in mid-latitude northeast Pangea and Gondwanan glacial-interglacial in mid Sakmarian-early Kungurian provides clues that glaciation may have exerted a substantial control on climatic changes in mid-latitude Northern Hemisphere"--Abstract, page iv.


Yang, Wan

Committee Member(s)

Gao, Stephen S.
Wronkiewicz, David J.
Obrist-Farner, Jonathan
Wan, Mingli
Tabor, Neil J.


Geosciences and Geological and Petroleum Engineering

Degree Name

Ph. D. in Geology and Geophysics


This research was partially supported by four student research grants from Geological Society of America, American Association of Petroleum Geologists, and Chinese Academy of Sciences (grant no. SKLOG-201603), and NSF GEOSCI grant (1714749) and NSF China grant (41428201).


Missouri University of Science and Technology

Publication Date

Fall 2019

Journal article titles appearing in thesis/dissertation

  • One-to-one relationship between litho- and organo-facies in cyclic lacustrine deposits of lower-Permian Lucaogou low-order cycle, Bogda Mountains, NW China
  • Enhanced aridity and seasonality of mid-latitude northeast Pangaea induced by late Paleozoic deglaciation


xi, 127 pages

Note about bibliography

Includes bibliographic references.

Geographic Coverage

Bogda Mountains, Xinjiang Uygur Autonomous Region, Northwestern China

Time Period

Permian; Paleozoic


© 2019 Xin Zhan, All rights reserved.

Document Type

Dissertation - Open Access

File Type




Thesis Number

T 11658

Electronic OCLC #



Dissertation Location