《下扬子区二叠纪古地理和地球化学环境》求取 ⇩

目录1

序言1

PREFACE1

前言1

INTRODUCTION1

第一章　地质概况和区域古地理基本轮廓1

一、地质概况1

二、区域古地理基本轮廓6

一、鬼门关二叠系上统剖面15

第二章　岩相段的岩类、化石及沉积特征简述15

二、平顶山二叠系下统剖面17

第三章　岩石和矿物特征22

一、碳酸盐岩类22

二、硅质岩类（燧石）25

三、粘土岩类及粘土矿物特征27

四、碎屑岩及长石砂岩的成因40

第四章　元素地球化学特征和指相化学组分42

一、化学元素组分与岩类的关系42

二、沉积化学组合在剖面上的分布规律及其在沉积序列分析中的应用42

三、指相化学组分与沉积环境的关系47

一、稀土元素在剖面上的分布概况59

第五章　稀土元素地球化学特征59

二、碳酸盐岩及其钙质化石的稀土元素分布特征62

三、钙质古土壤和不纯碳酸盐岩的稀土元素分布特征64

四、二叠系“黑岩”的稀土元素特征66

五、磷质结核的稀土元素特征69

六、燧石的稀土元素特征70

七、三叠系—二叠系（T/P）界线的白色粘土和船山组顶部的风化铁壳的稀土71

元素特征71

第六章　稳定同位素特征74

一、碳同位素特征与环境的关系74

二、氧同位素特征及古温度77

三、碳、氧同位素特征与成岩及后生作用的关系78

四、化石和围岩的碳、氧同位素值的差别79

第七章　有机地球化学特征80

一、有机碳和还原硫的分布规律80

二、二叠系“黑岩”中的有机地球化学特征81

三、有机组分与古环境关系90

第八章　古地球化学环境综合分析92

一、二叠系沉积前的环境92

二、二叠纪沉积环境94

三、二叠纪初期的环境98

结论99

参考文献102

附　地层剖面综合描述104

图版说明113

PERMIAN PALAEOGEOGRAPHY AND GEOCHEMICAL115

ENVIRONMENT IN LOWER YANGTZE REGION,CHINA115

Chapter 1 GENERAL SITUATION OF GEOLOGY AND BASICAL OUTLINE115

OF REGIONAL PALAEOGEOGRAPHY115

1.1 General situation of geology115

1.2 Basical outline of regional palaeogeography117

Chapter 2 A BRIEF ACCOUNT ON PETROGRAPHICAL CATEGORY,FOSSIL124

AND DEPOSITIONAL CHARACTERISTICS OF LITHOFACIES124

MEMBERS124

2.1 Upper Permian Guimenguan section125

2.2 Lower Permian Pingdingshan section127

Chapter 3 CHARACTERISTICS OF ROCKS AND MINERALS134

3.1 Carbonate rocks（carbonates）134

3.2 Silicolites（cherts）140

3.3 Characteristics of clayrocks and clay minerals142

3.4 Genesis of clastic rocks and feldspathic sandstone145

Chapter 4 GEOCHEMICAL CHARACTERISTICS OF THE ELEMENTS AND148

THE INDICATOR CHEMICAL CONSTITUENTS148

4.1 Relationship between chemical element compositions and rock types148

4.2 Distribution of sedimentary chemical associations in section and applicationof chemical associations to analysis of sedimentary sequences149

4.3 Relationship between indicator chemical constituents and sedimentaryenvironments151

5.1 REE distribution in section165

Chapter 5 CHARACTERISTICS OF REE GEOCHEMISTRY165

5.2 REE distribution characteristic of carbonates and calcareous fossils167

5.3 REE distribution characteristic of palaeosols and impure carbonates168

5.4 REE distribution characteristic of“black rocks”168

5.5 REE distribution characteristic of phosphatic nodules170

5.6 REE distribution characteristic of cherts171

5.7 REE distribution characteristic of white clay in the T/P boundary andweathered iron crust at the top of the Chuanshan Formation171

Chapter 6 CHARACTERISTICS OF STABLE ISOTOPES174

6.1 Relationship between C isotopic feature and environment174

6.2 Characteristic of oxygen isotope178

6.3 Characteristic of C,O isotope and relation with diagenesis and epigenesis179

6.4 Difference of C and O isotopes in fossils and country rocks180

Chapter 7 CHARACTERISTICS OF ORGANIC GEOCHEMISTRY181

7.1 Discussion of organic carbon and reductive sulfur181

7.2 Results of organic analysis on“black rock”182

7.3 Discussion of paleoenvironment according to organic geochemical feature184

Chapter 8 GEOCHEMICAL PALEOENVIRONMENTAL ANALYSIS186

8.1 Pre-Permian environment186

8.2 Permian environment189

8.3 Early Triassic paleoenvironment197

CONCLUSIVE REMARKS199

THE EXPLANATION OF PLATES204