The Central Atlantic Magmatic Province: Insights from Fragments of Pangea

The Central Atlantic Magmatic Province Insights from Fragments of Pangea......Page 3
Copyright
......Page 4
CONTENTS......Page 5
PREFACE......Page 7
OVERVIEW OF RESEARCH ON THE CENTRAL ATLANTIC MAGMATIC PROVINCE......Page 9
The CAMP as an Agent of Planetary Catastrophe......Page 10
REFERENCES......Page 13
1. INTRODUCTION......Page 15
2.1 Newark Basin......Page 16
2.2 Other Exposed Rift Basins in the US......Page 20
2.3 Fundy and Moroccan Basins......Page 21
3. MAGNETOSTRATIGRAPHIC CONSTRAINTS......Page 26
3. BIOSTRATIGRAPHIC CONSTRAINTS......Page 27
6. RELATIONSHIP OF CAMP TO TRIASSIC-JURASSIC BOUNDARY......Page 29
7. CLUBHOUSE CROSSROADS BASALT, SEAWARD DIPPING REFLECTORS, AND CAMP......Page 31
8. REMAINING CHALLENGES......Page 33
9. CONCLUSIONS......Page 34
REFERENCES......Page 35
1. INTRODUCTION......Page 41
2. BASIC CONCEPTS AND DEFINITIONS......Page 43
3. CAMP AS A TEMPORAL BENCHMARK......Page 47
5.1. CAMP Basalts, Rift Basins, and the Diachronous End of Rifting......Page 49
5.2. Different State of Stress in Southern and Northern Rift Segments During CAMP......Page 53
5.4. Initiation of Seafloor Spreading and Formation of SDR's......Page 54
6.2. Interpretations......Page 57
6.4. Uncertainties in Inversion-Related Shortening Direction and Magnitude......Page 58
6.6. Causes of Inversion on Passive Margins......Page 59
REFERENCES......Page 62
INTRODUCTION......Page 68
Scotian Basin......Page 69
Georges Bank Basin......Page 70
Baltimore Canyon Trough......Page 73
Carolina Trough and Blake Plateau Basin......Page 74
AGES FROM SEA-FLOOR-SPREADING RATES......Page 76
SUMMARY AND CONCLUSIONS......Page 78
REFERENCES......Page 80
2. EVALUATION OF AGES......Page 83
3. REDUCTION OF 4 0 Ar/39Ar AGES TO A COMMON BASE......Page 84
4.1 Dikes/Sills/Lavas in the North Eastern United States......Page 85
4.3 Rocks From Iberia, Morocco and Mali......Page 86
4.4 Tholeiites from French Guyana, Surinam, Guinea and Liberia......Page 87
5. DISCUSSION......Page 89
REFERENCES......Page 95
The central atlantic magmatic province camp in brazil: petrology, geochemistry, 4 0 ar/ 39 ar ages, paleomagnetism and geodynamic implications......Page 97
Cassipore dykes......Page 98
40ar/39ar ages of the brazilian camp tholeiites......Page 100
Amazonia sills......Page 101
Amazonia Sills......Page 102
Anari and Tapirapuá Flows......Page 103
Major and Trace Elements......Page 104
Variation Diagrams and Trace Element Relationships......Page 107
REE and multi-elemental Diagrams......Page 108
Sr-Nd Isotopes......Page 114
PALEOMAGNETISM......Page 121
GEODYNAMIC IMPLICATIONS......Page 122
CONCLUSIONS......Page 127
REFERENCES......Page 131
INTRODUCTION......Page 135
GEOLOGICAL ASPECTS......Page 137
ROCKMAGNETISM......Page 139
DISCUSSION AND CONCLUSIONS......Page 141
CONCLUDING REMARKS......Page 150
REFERENCES......Page 153
INTRODUCTION......Page 156
Initial CAMP......Page 157
Secondary CAMP......Page 158
CHEMICAL CHARACTERISTICS OF CAMP BASALT......Page 159
CAMP BASALT COMPOSITIONS COMPARED TO ARC AND BACK-ARC BASALTS......Page 161
THE SOURCE OF CAMP......Page 162
REFERENCES......Page 165
INTRODUCTION......Page 168
GEOLOGICAL SETTING......Page 171
GEOCHEMICAL CHARACTERISTICS OF THE CAMP DIKES......Page 172
COMPARISON WITH OTHER LIPS......Page 176
CONSEQUENCES FOR CONTINENTAL BREAKUP......Page 177
REFERENCES......Page 179
INTRODUCTION......Page 183
1.1. Sedimentary Characteristics of the Late Triassic-Early Jurassic of Morocco and Portugal......Page 184
1.2. Volcanic Occurrences......Page 186
1.4. Age of Late Triassic-Early Jurassic Magmatism......Page 191
2.1. Petrography and Mineralogy......Page 196
2. 2. Geochemistry......Page 197
3. THE LATE TRIASSIC-EARLY JURASSIC MAGMATISM FROM MOROCCO AND PORTUGAL IN THE GEODYNAMIC CONTEXT OF CENTRAL ATLANTIC OPENING......Page 200
CONCLUSIONS......Page 201
REFERENCES......Page 206
The Northernmost CAMP: 40 Ar/39 Ar age, Petrology and Sr-Nd-Pb Isotope Geochemistry of the Kerforne Dike, Brittany, France......Page 212
2. GEOLOGICAL SETTING AND SAMPLING......Page 213
4. PETROGRAPHY AND MINERALOGY......Page 216
5. AR/AR GEOCHRONOLOGY......Page 217
6.1. Major and Trace Elements......Page 219
6.2. Sr, Nd, Pb Isotopic Compositions......Page 220
7.1. Fractional Crystallization......Page 221
7.2. Alteration and Crustal Assimilation......Page 222
8.2. Isotopic Constraints......Page 225
REFERENCES......Page 227
1. INTRODUCTION......Page 230
2.1 North Mountain Basalts......Page 232
1.2. Feeder Dikes......Page 233
1.3. Anisotropy of Magnetic Susceptibility AMS......Page 234
3. RESULTS......Page 235
4. DISCUSSIO......Page 236
REFERENCES......Page 240
INTRODUCTION......Page 243
Ages......Page 244
Volume Estimates......Page 246
Geochemical Groups......Page 247
CAMP VOLATILES......Page 248
Sulfur Emissions......Page 250
Halogen Emissions......Page 251
CONCLUSION......Page 253
REFERENCES......Page 254
INTRODUCTION......Page 257
STRATIGRAPHIC RELATIONSHIP OF EXTINCTION AND VOLCANISM......Page 258
DURATION OF THE CARBON ISOTOPE ANOMALY AND THE RHAETIAN STAGE......Page 259
STRONTIUM AND OSMIUM ISOTOPIC RECORD OF THE TRIASSIC-JURASSIC TRANSITION......Page 261
OBSERVED EXTINCTION PATTERNS OF KEY FOSSIL GROUPS......Page 262
PREDICTIONS OF A VOLCANIC FORCING HYPOTHESIS CONFRONTED WITH OBSERVATIONS......Page 263
COMPARISON WITH OTHER EXTINCTIONS LINKED TO LARGE IGNEOUS PROVINCES......Page 264
CONCLUSIONS......Page 265
REFERENCES......Page 266