cover

Raoul C. Mitchell-Thomé:

Geology of the South Atlantic Islands

1970. X, 367 pages, 106 figures, 95 tables, 17x25cm, 1100 g
Language: English

(Beiträge zur regionalen Geologie der Erde, Band 10)

ISBN 978-3-443-11010-9, bound, price: 77.00 €

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Keywords

GeologieregionalSüdatlantikPaläontologieInselErdegeologyregionalSouth Atlanticpaleontologyislandearth

Contents

Inhaltsbeschreibung top ↑

In diesem Buch werden die Südatlantischen Inseln, gruppiert nach ihrer nationalen Zugehörigkeit zu Brasilien, England, Portugal und Spanien, besprochen. Die Inseln sind, mit Ausnahme der Falkland Inseln, vulkanisch oder haben ein vulkanisches Fundament und sind besonders starken marinen Erosionen ausgesetzt. Die petrographische und chemische Entwicklung der Gesteinsformationen wird beschrieben und mit denen anderer Inseln im Nordatlantik verglichen.

Content Description top ↑

In this book the South Atlantic Islands, grouped accordingly to their nationality Brazil, England, Portugal and Spain are discussed. With exception of the Falkland Islands, all the islands are volcanic or have a volcanic foundation. Marine erosion is taking drastic toll. Petrographical and chemical evolution of rock formations is described and compared with those of other islands in the North Atlantic.

Contents top ↑

Chapter 1: 1
Introduction 1
Acknowledgements 3

The Brazilian Islands
Chapter 2: Saint Paul Rocks 4
General 4
Geology 4
Chapter 3: Fernando de Noronha 12
General 12
Physical Features 14
Climate 15
Geology 16
Remedios Formation 16
Quixaba Formation 23
Sao Jose Formation 25
Sedimentary Rocks 26
Old Sediments 26
Young Sediments 29
Geomorphology 30
Mineralogy 34
Petrography 35
Remedios Formation 40
Quixaba Formation 48
Sao Jose Formation 50
Xenoliths and Ejectiles 51
Pyroclastics 52
Eruptive Breccias 53
Petrochemistry 53
Petrochemical Character of the Fernando de Noronha Province 53
Comparisons 59
Petrogenesis 60
Age of the Volcanics 62
Radiometric Age Determinations 63
Chapter 4: Rocas Atoll 65
Chapter 5: Trindade 67
General 67
Physical Features 68
Climate 69
Geology 70
Trindade Complex 70
Desejado Sequence 72
Morro Vermelho Formation 73
Valado Formation 74
Paredao Volcano 75
Geomorphology 76
Mineralogy 80
Petrography 81
Trindade Complex 81
Desejado Sequence 87
Morro Vermelho Formation 89
Valado Formation 89
Paredao Volcano 89
Xenoliths and Ejectiles 90
Pyroclastics 92
Petrochemistry 92
Petrogenesis 97
Geological Considerations on the Age of the Trindade Vulcanism 99
Geochronology of the Trindade Volcanics 100
Chapter 6: Martin Van Archipelago 102

The Portuguese Islands

Chapter 7: Sao Tome 105
General 105
Physical Features 105
Climate 108
Geology 108
Igneous Rocks 111
Basaltic Facies 112
Non-Basaltic Feldspathoidal Facies 115
Sedimentary Rocks 121
Palaeontology 123
Chapter 8: Principe 125
General 125
Physical Features 125
Climate 126
Geology 126
Igneous Rocks 128
Sedimentary Rocks 141
Palaeontology 143
Economic Geology 144
Geological Evolution 145
The Spanish Islands
Chapter 9: Fernando Poo 146
General 146
Physical Features 147
Climate 147
Geology 148
Chapter 10: Annobon 156
General 156
Climate 157
Geology 157
Petrography 158
The British Islands

Chapter 11: Ascension 162

General 162
Physical Features 163
Climate 163
Geology 164
Petrography 172
Petrology 189
Isotope Geochemistry 193
Economic Geology 194
Chapter 12: St.Helena 195

General 195
Physical Features 196
Climate 197
Geology 197
Igneous Rocks 198
Sedimentary Rocks 202
Petrography of the Igneous Rocks 203
Basalts 203
Phonolites 206
Form of the SW Magma Chamber 213
Structure 215
Economic Geology 217
Age of St. Helena 219
Geochronology 219
Geological Evolution 221
Chapter 13: Tristan da Cunha Group 224
General 224
Physical Features 226
Tristan da Cunha 226
Inaccessible Island 228
Nightingale Group 229
Climate 229
Geology 229
Tristan da Cunha 229
Inaccessible Island 235
Nightingale Group 238
Petrography 241
Nomenclature 241
Rock Types 242
Norms and Modal Composition 257
Additional Comments 265
Magma Differentiation and Genesis 269
Provincial Relationship 272
Physiography 272
Vulcanology 272
Petrography 273
Chemistry 274
Economic Geology 276
Geochronology of the Tristan Group 277
Geological Evolution 279
The 1961 Eruption 281
Tremor Phase 283
Eruption Phase 283
Morphology 284
Petrography 284
Chapter 14: Gough Island 286
General 286
Physical Features 286
Climate 287
Geology 287
Petrography 289
Isotope Geochemistry 302
Geological Evolution 304
Age Determinations 306
Chapter 15: Falkland Islands 306
General 306
Physical Features 307
Climate 307
Geology 308
Sedimentary Rocks 308
Igneous Rocks 309
Metamorphic Rocks 310
Stratigraphy 310
Precambrian 312
Palaeozoic 313
Lower Devonian 313
Middle Devonian 314
Lower Carboniferous (?) 315
Upper Carboniferous (?) 316
Permo-Carboniferous 316
Permian 318
Palaeozoic-Mesozoic 320
Permo-Triassic 321
Mesozoic 321
Triassic 321
Quaternary 322
Palaeontology 324
Structure 327
Economic Geology 329
Geological Evolution 329
Palaeogeographic Connexions with South America - chiefly Argentina 331
Palaeogeographic Connexions with South Africa 334
Opposing Views of Palaeogeographic Relationship 334
Abstract 336
Zusammenfassung 337
Bibliography 341
Subject Index 351
Index of Fossil Names 356
Locality Index 358
Author Index 365