下扬子区二叠纪古地理和地球化学环境PDF电子书下载

目录 1

序言 1

PREFACE 1

前言 1

INTRODUCTION 1

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 GEOCHEMICAL 115

ENVIRONMENT IN LOWER YANGTZE REGION,CHINA 115

Chapter 1 GENERAL SITUATION OF GEOLOGY AND BASICAL OUTLINE 115

OF REGIONAL PALAEOGEOGRAPHY 115

1.1 General situation of geology 115

1.2 Basical outline of regional palaeogeography 117

Chapter 2 A BRIEF ACCOUNT ON PETROGRAPHICAL CATEGORY,FOSSIL 124

AND DEPOSITIONAL CHARACTERISTICS OF LITHOFACIES 124

MEMBERS 124

2.1 Upper Permian Guimenguan section 125

2.2 Lower Permian Pingdingshan section 127

Chapter 3 CHARACTERISTICS OF ROCKS AND MINERALS 134

3.1 Carbonate rocks（carbonates） 134

3.2 Silicolites（cherts） 140

3.3 Characteristics of clayrocks and clay minerals 142

3.4 Genesis of clastic rocks and feldspathic sandstone 145

Chapter 4 GEOCHEMICAL CHARACTERISTICS OF THE ELEMENTS AND 148

THE INDICATOR CHEMICAL CONSTITUENTS 148

4.1 Relationship between chemical element compositions and rock types 148

4.2 Distribution of sedimentary chemical associations in section and applicationof chemical associations to analysis of sedimentary sequences 149

4.3 Relationship between indicator chemical constituents and sedimentaryenvironments 151

5.1 REE distribution in section 165

Chapter 5 CHARACTERISTICS OF REE GEOCHEMISTRY 165

5.2 REE distribution characteristic of carbonates and calcareous fossils 167

5.3 REE distribution characteristic of palaeosols and impure carbonates 168

5.4 REE distribution characteristic of“black rocks” 168

5.5 REE distribution characteristic of phosphatic nodules 170

5.6 REE distribution characteristic of cherts 171

5.7 REE distribution characteristic of white clay in the T/P boundary andweathered iron crust at the top of the Chuanshan Formation 171

Chapter 6 CHARACTERISTICS OF STABLE ISOTOPES 174

6.1 Relationship between C isotopic feature and environment 174

6.2 Characteristic of oxygen isotope 178

6.3 Characteristic of C,O isotope and relation with diagenesis and epigenesis 179

6.4 Difference of C and O isotopes in fossils and country rocks 180

Chapter 7 CHARACTERISTICS OF ORGANIC GEOCHEMISTRY 181

7.1 Discussion of organic carbon and reductive sulfur 181

7.2 Results of organic analysis on“black rock” 182

7.3 Discussion of paleoenvironment according to organic geochemical feature 184

Chapter 8 GEOCHEMICAL PALEOENVIRONMENTAL ANALYSIS 186

8.1 Pre-Permian environment 186

8.2 Permian environment 189

8.3 Early Triassic paleoenvironment 197

CONCLUSIVE REMARKS 199

THE EXPLANATION OF PLATES 204