Organic Geochemical Characteristics and Paleo-Environments o

发布时间：2023-04-20 20:26

　　

【文章页数】：73 页

【学位级别】：硕士

【文章目录】：
Abstract
Chapter 1 Introduction
    1.1 Research Process Flow Chart
    1.2 Thesis Objectives
Chapter 2 Geological Settings
Chapter 3 Experimental Procedures
    3.1 Sampling
    3.2 Sample Preparation
    3.3 Toc and Rock-eval
    3.4 Gas Chromatography and Mass spectrometry(GC/MS)Analysis
    3.5 Gas chromatography–mass spectrometry-mass spectrometry(GC–MS-MS)
    3.6 Stable carbon isotope analysis
Chapter 4 Basis for current Research
    4.1 Origin of life
    4.2 Cambrian explosion
    4.3 Previous work on Doushantuo Formation
    4.4 Earth’s oldest Fossils
Chapter 5 Results
    5.1 Toc and Rock-Eval pyrolysis analysis
    5.2 Stable carbon isotope compositions
        5.2.1 Carbon isotope compositional curve of saturated hydrocarbon
    5.3 Biomarker distribution
        5.3.1 N-alkanes
        5.3.2 Pristane and phytane
        5.3.3 Odd/Even Predominance(OEP)and the Carbon Preference Index(CPI)
    5.4 Terpanes
    5.5 Steranes
    5.6 Aromatic compounds
Chapter 6 Discussions
    6.1 Importance of24-n-propylcholestanes and24-isopropylcholestane
    6.2 The presence of Dinoflagellates in Ediacaran-early Cambrian period
    6.3 Organic source input
    6.4 Redox conditions and paleo-depositional environments
    6.5 Originity of Hydrocarbons of Weng’an Doushantuo Formation
    6.6 Thermal maturity
Conclusions
Acknowledgements
References



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