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華北地臺(tái)寒武紀(jì)鮞粒沉積學(xué)與層序地層學(xué)綜合研究

發(fā)布時(shí)間:2021-01-25 07:50
  華北地臺(tái)屬于中朝板塊,為東西長(zhǎng)約1500 km,南北長(zhǎng)約1000 km的巨大克拉通臺(tái)地。華北很多區(qū)域(如山西、河北以及內(nèi)蒙古等)露頭的都是研究寒武系上部鮞粒灘沉積和劃分層序地層的很好的剖面。一般而言,華北地臺(tái)寒武系苗嶺統(tǒng)以普遍發(fā)育鮞粒灘為特征,而芙蓉統(tǒng)則主要由風(fēng)暴沉積的竹葉狀礫屑灰?guī)r以及生物丘組成。但本次研究卻在岢嵐剖面苗嶺統(tǒng)和芙蓉統(tǒng)均發(fā)現(xiàn)了厚層鮞粒灘沉積,因其特殊的沉積序列而被選為論文的研究對(duì)象。根據(jù)最新寒武紀(jì)年代地層劃分,以沉積相變化所反映的沉積趨勢(shì)及旋回性為依據(jù),岢嵐剖面的寒武系可劃分為7個(gè)三級(jí)層序(DS1-DS7)。研究剖面出露寒武系苗嶺統(tǒng)的徐莊組、張夏組和崮山組,以及芙蓉統(tǒng)的長(zhǎng)山組和鳳山組,沉積相從徐莊組混合潮坪相向上變?yōu)榫徠滦吞妓猁}巖沉積(張夏組、崮山組、長(zhǎng)山組和鳳山組),沉積層序由“TST+CS+HST”轉(zhuǎn)變?yōu)椤癈S+HST”,這一過(guò)程表明了碳酸鹽臺(tái)地從未成熟期向成熟期的轉(zhuǎn)變。寒武系下部與太古代變質(zhì)巖呈不整合接觸,上部與奧陶系冶里組呈平行不整合接觸。研究區(qū)寒武系鈣質(zhì)泥巖組成的凝縮段,由泥晶灰?guī)r組成的深—中緩坡相,以及苗嶺統(tǒng)、芙蓉... 

【文章來(lái)源】:中國(guó)地質(zhì)大學(xué)(北京)北京市 211工程院校 教育部直屬院校

【文章頁(yè)數(shù)】:134 頁(yè)

【學(xué)位級(jí)別】:博士

【文章目錄】:
摘要
abstract
Chapter1 Introduction
    1.1 Overview and Topic Selection
    1.2 Sequence Stratigraphy:New Advancement
    1.3 Cambrian Calcite Grains
        1.3.1 Cambrian Calcite Non-skeletal Grains
            1.3.1.1 Coated Grains
            1.3.1.2 Peloids
            1.3.1.3 Grain Aggregate
            1.3.1.4 Clasts
        1.3.2 Cambrian Calcite Skeletal Grains
            1.3.2.1 Calcareous Plants
            1.3.2.2 Skeletal Fossils
    1.4 Ooids
        1.4.1 Comparison Between Modern and Ancient Ooids
            1.4.1.1 Modern Ooids
            1.4.1.2 Ancient Ooids
    1.5 Aims and Objectives
    1.6 Scientific Problems
        1.6.1 Standard Model of Sequence Stratigraphy
        1.6.2 Wilson Model
        1.6.3 Mineralogy of Ooids
        1.6.4 Origin of Ooids
    1.7 Methodology
        1.7.1 Field Work
        1.7.2 Laboratory Work
        1.7.3 Data Analysis and Compilation of Research
    1.8 Innovations
Chapter2 Cambrian Stratigraphy and Petrography of North China
    2.1 Cambrian Chronostratigraphy
        2.1.1 Chronological Cambrian Division
    2.2 Cambrian Lithostratigraphy
        2.2.1 Generalized Stratigraphy of North China Platform
            2.2.1.1 Sequence Stratigraphy of Miaolingian
            2.2.1.2 Sequence Stratigraphy of Furongian
    2.3 Generalized Petrography of North China Platform
        2.3.1 Girvanllea-Cortex ooids
        2.3.2 Girvanella-Core Ooids
        2.3.3 Full-Girvanella Ooids
        2.3.4 Girvanella-Deformed Ooids
Chapter3 Sequence Stratigraphy of Kelan Section,Shanxi Province
    3.1 Sequence Stratigraphic Division
        3.1.1 Huoshan Formation(DS1)
        3.1.2 Xuzhuang Formation(DS2)
        3.1.3 Zhangxia Formation(DS3)
        3.1.4 Gushan Formation(DS4)
        3.1.5 Changshan Formation(DS5)
        3.1.6 Fengshan Formation(DS6-7)
    3.2 Forced Regression and Development of Ooid-Grain Bank
Chapter4 Oolitic-Grain Bank and Associated Microfacies at Kelan Section,Shanxi Province
    4.1 Oolitic-Grain Bank
        4.1.1 Xuzhuang Formation
        4.1.2 Zhangxia Formation
        4.1.3 Gushan Formation
        4.1.4 Changshan Formation
        4.1.5 Fengshan Formation
    4.2 Microfacies
        4.2.1 Ooidal Bioclastic Dolo-Grainstone(MF-1)
        4.2.2 Ooidal Intraclastic Dolo-Grainstone(MF-2)
        4.2.3 Ooidal Dolostone(MF-3)
        4.2.4 Lime Mudstone(MF-4)
        4.2.5 Ooidal Bioclastic Dolo Pack-to Grainstone(MF-5)
        4.2.6 Microbialitic Boundstone(MF-6)
Chapter5 Possible Forming Mechanism of the Cambrian Calcite Ooids
    5.1 Forming environment
        5.1.1 Drowning Mechanisms
        5.1.2 Platform Drowning Reflected by Microfacies of Kelan Section
            5.1.2.1 Pre-drowning Phase
            5.1.2.2 Drowning Phase
            5.1.2.3 Post-drowning Phase
    5.2 Microfacies Composition
    5.3 Complex Ooids Forming Mechanism Dominated by Cyanobacteria Biofilm
Chapter6 Conclusions
Acknowledgements
References
Appendix


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