Deep Drilling Results in the Atlantic Ocean: Continental Margins and Paleoenvironment

Title Page......Page 3
Copyright
......Page 4
Preface......Page 5
Contents......Page 6
Mesozoic-Cenozoic Sedimentary Formations of the North American Basin; Western North Atlantic......Page 7
Structural Setting......Page 8
Methods......Page 10
Definition of Formations......Page 12
Contacts......Page 13
Acoustic Character......Page 15
Depositional Environment......Page 17
Type Locality......Page 19
Regional Aspects......Page 21
Acoustic Character......Page 22
Summary......Page 52
References......Page 58
Introduction......Page 64
The Deepest Reflectors......Page 65
The Nature of Horizon B......Page 67
Carbonate Deposition Below Horizon β......Page 69
Horizon  β To Horizon A*: Black and Multicolored Clays
......Page 72
Paleogene Sedimentation and the Horizon-A Complex......Page 79
Horizon AC......Page 80
Horizon AT and Formation of the Bermuda Rise......Page 82
Late Paleogene Sedimentation, Erosion, and the orgin of Horizon AU......Page 83
Neogene Current-Controlled Sedimentation......Page 86
Summary......Page 88
References......Page 89
Introduction......Page 93
Common Depth Point CDP Seismic Profiles......Page 96
Gravity Measurements......Page 97
Overview......Page 98
Georges Bank Basin......Page 101
Long Island Platform......Page 102
Baltimore Canyon Trough......Page 103
Carolina Platform and Carolina Trough......Page 107
References......Page 110
Introduction......Page 115
Drilling Results......Page 116
Stratigraphic Cross-Section......Page 120
Subsidence of Blake Plateau......Page 126
References......Page 127
Biostratigraphy......Page 129
High-Latitude Nannoplankton......Page 130
Paleobiogeography......Page 132
Distribution of Micula staurophora, Watznaueria, and Cyclagelosphaera......Page 135
Distribution of Species of Biscutum......Page 136
Paleobiogeography on the Agulhas and Mozambique Plateaus......Page 138
Paleobiogeography on the Falkland Plateau......Page 139
Comparison with Planktonic Foraminifera Paleobiogeography......Page 140
Summary and Conclusions......Page 141
References......Page 142
The Northwestern Iberian Margin: A Cretaceous Passive Margin Deformed During Eocene 1......Page 144
I - Stratigraphy and Sedimentary Evolution Tables I And II.
......Page 145
III - Extension Tectonics During the Mesozoic
......Page 147
IV - Compression Tectonics During Eocene
......Page 149
V - Miocene Tectonics......Page 154
Vi - Discussion and Conclusion
......Page 155
Acknowledgements......Page 157
References......Page 158
Introduction......Page 160
Correlation of Formations with the Lithological Units of the Holes
......Page 165
The Main Unconformities......Page 169
The Rifting Phase......Page 171
Discussion on Rifting and Thinning of the Crust
......Page 179
Speculation on the Mechanism of Rifting
......Page 180
The Post Rifting History......Page 181
Acknowledgments......Page 189
References......Page 190
Introduction......Page 193
Geological Setting of the Cape Bojador Margin......Page 195
Early Cretaceous "Wealden" Facies......Page 198
The Pre-Miocene Sculpturing of the Base-of-the-Slope......Page 200
Evolution of Canary Island Volcanism......Page 202
Paleobathymetry and Subsidence History......Page 205
References......Page 207
Introduction......Page 210
Geologic Setting......Page 213
Canary Arch......Page 214
Villa Cisneros......Page 215
References......Page 219
Introduction......Page 221
Eustasy......Page 222
Thermal Parameters......Page 227
Lithospheric Models......Page 228
Discussion......Page 230
References......Page 236
Introduction......Page 238
Varying the Mean Age of the Ocean......Page 244
Relation Between Lysocline, Rate of Input,Hypsometric Curve and CCD......Page 246
Conclusions......Page 249
References......Page 250
Data Base and Data Treatment......Page 252
Distribution of Carbonate......Page 260
Oceanic Circulation and the Mesozoic Deep Sea Record......Page 268
References......Page 274
Introduction......Page 278
Tectonic and Physiographic Evolution of the North Atlantic
......Page 279
Major Asymmetries Between Eastern and Western Basins of the 
North Atlantic......Page 292
Conclusion......Page 295
References......Page 296
Paleoceanography as an Objective of Deep Sea Drilling......Page 300
Trends and Events: Inventory of the Cenozoic Ocean......Page 302
The Cretaceous Challenge: A Different Kind of Ocean......Page 307
A Focus for Paleoceanography......Page 311
References......Page 314
Introduction......Page 318
Source Material......Page 319
Distribution of Biogenic and Authigenic Silica in the Cretaceous to Tertiary Sediments of the Atlantic Ocean......Page 323
Formation of Weakly Opal-CT Cemented Sediments and Porcellanites......Page 326
Formation of Authigenic Silicates......Page 329
Diagenetic Maturation with Respect to Age, Burial Depth Temperature and Host Rock Lithology......Page 331
Conclusions: Diagenetic Potential and Transformations......Page 333
References......Page 341
Origin of Marine Clays......Page 344
2. Types of Organic Matter
......Page 364
3. Distribution of the Organic Matter in Cretaceous Cores of the North Atlantic 
......Page 367
4. Environments Responsible for the Accumulation of Organic Matter
......Page 368
5. Paleoenvironment of the North Atlantic
......Page 370
References......Page 375
Introduction......Page 377
Regional Setting of South Atlantic DSDP Sites During the Cretaceous......Page 378
Organic Carbon in South Atlantic Cretaceous Carbonaceous Sediments......Page 382
Sedimentary Indicators of Anoxicand Hypersaline Water Masses......Page 386
Age-Depth Relationships and the Linkage of Oceanographic Events in theCretaceous South Atlantic......Page 388
North Atlantic Carbonaceous Sediments - Regional Setting......Page 390
Organic Matter in North Atlantic Sediment......Page 392
Lithology of Carbonaceous Sediment in the North Atlantic......Page 394
Evolution in the Central North Atlantic......Page 395
Conclusions......Page 397
References......Page 398
Mediterranean Salinity Crisis......Page 404
Response of the Open Ocean to the Mediterranean Salinity Crisi
s......Page 408
Importance of the Cape Bojador Record DSDP Site 397
......Page 410
Acknowledgments......Page 418
References......Page 419
Stratigraphy......Page 422
Palynology......Page 424
Conclusions......Page 434
Sedimentary Origin of Palynofacies......Page 435
Summary......Page 438
References......Page 439