Avalonian and Cadomian Geology of the North Atlantic

1 Introduction. - References. - 2 The Longmyndian Supergroup and related Precambrian sediments of England and Wales. - 2.1 Introduction. - 2.2 Longmyndian Supergroup, Welsh Borderland. - 2.2.1 Stratigraphy of the Longmyndian Supergroup. - 2.2.2 Structure of the Longmyndian Supergroup. - 2.2.3 Sedimentology of the Longmyndian Supergroup. - 2.3 Old Radnor Inlier, Welsh Borderland. - 2.4 Charnian Supergroup, Leicestershire. - 2.5 Llangynog Inlier, Dyfed. - 2.6 Other outcrops of Precambrian sediments in England and the Welsh Borderland. - 2.7 Depositional setting of the Precambrian sediments. - References. - 3 Pre-Arenig terranes of northwest Wales. - 3.1 Introduction and historical perspective. - 3.2 The Monian Supergroup. - 3.3 The Coedana Complex. - 3.4 The southeast Anglesey blueschists. - 3.5 The Sara Complex. - 3.6 Regional correlations. - 3.7 Overstep sequences and age constraints. - 3.8 Monian tectonics: an overview. - References. - 4 The Rosslare Complex: a displaced terrane in southeast Ireland. - 4.1 Introduction. - 4.2 The Rosslare Complex: constituents and geological history. - 4.2.1 Early tectono-thermal history. - 4.4.2 The second event (M2). - 4.2.3 The third event (M3). - 4.2.4 The fourth event (M4). - 4.3 Rocks marginal to the Rosslare Complex. - 4.3.1 Tomhaggard Zone. - 4.3.2 Silverspring Zone. - 4.3.3 Tagoat Group. - 4.3.4 The Ballycogly Group. - 4.3.5 Cullenstown Formation. - 4.3.6 Tuskar Group. - 4.4 Caledonian intrusions. - 4.4.1 Saltees Granite. - 4.4.2 Younger basic dykes. - 4.4.3 Carnsore Granite. - 4.5 Conclusions. - References. - 5 Cadomian terranes in the North Armorican Massif, France. - 5.1 Introduction. - 5.2 St. Brieuc terrane (SBT). - 5.2.1 Pre-Cadomian Icartian basement. - 5.2.2 The Penthievre complex. - 5.2.3 Brioverian supracrustals. - 5.2.4 Cadomian magmatism. - 5.3 St. Malo terrane (SMT). - 5.4 Mancellian terrane (MT). - 5.5 Nature and timing of deformation. - 5.6 Post-Cadomian sedimentation. - 5.7 Regional correlations. - 5.7.1 Guernsey, Sark, Alderney and Cap de la Hague. - 5.7.2 Jersey. - 5.7.3 Lower Normandy. - 5.8 Geotectonic setting. - References. - 6 Precambrian of the Bohemian Massif, Central Europe. - 6.1 Introduction. - 6.2 The Bohemian Massif. - 6.3 The Moldanubian. - 6.4 The Brioverian. - 6.4.1 The Lower Brioverian. - 6.4.2 The Middle Brioverian. - 6.4.3 The Upper Brioverian. - 6.5 Unit boundaries. - 6.6 Cadomian deformation. - 6.7 Cadomian metamorphism and plutonism. - References. - 7 Precambrian terranes in the Iberian Variscan Foldbelt. - 7.1 Introduction. - 7.2 Precambrian sequences and history of northwest Iberia suspect terranes. - 7.3 Stratigraphy of Precambrian sequences in the Iberian terrane. - 7.3.1 Pre-orogenic sequences. - 7.3.2 Syn-orogenic sequences. - 7.4 Late Precambrian tectono-thermal evolution of the Iberian terrane: the Cadomian orogeny. - 7.4.1 Cadomian deformational events. - 7.4.2 Cadomian metamorphism. - 7.4.3 Cadomian igneous activity. - 7.4.4 The Cadomian orogeny in the Iberian terrane from a terrane perspective. - References. - 8 The West African orogens and Circum-Atlantic correlatives. - 8.1 Introduction. - 8.2 Mauritanide, Bassaride, and Rokelide orogens. - 8.2.1 Geologic setting. - 8.2.2 Tectono-thermal history. - 8.2.3 Geophysical controls on tectonic models. - 8.2.4 Geodynamic models. - 8.3 Southern Appalachian orogen. - 8.4 Pre-Cretaceous crystalline basement beneath the Atlantic and Gulf Coastal Plains of the southeastern United States. - 8.4.1 Suwannee terrane. - 8.4.2 Structure. - 8.4.3 Relationship to Appalachian elements. - 8.4.4 Wiggins Uplift. - 8.4.5 Southwestern Alabama Igneous Complex. - 8.4. 6 Regional tectonic relations. - 8.5 Appalachian-West African correlations. - 8.6 Terrane accretion in the southern Appalachian orogen. - References. - 9 The Avalon Zone type area: southeastern Newfoundland Appalachians. - 9.1 Introduction. - 9.2 Characteristic lithology and age. - 9.3 Boundaries. - 9.4 Precambrian stratigraphy. - 9.4.1 Pre-635 Ma rocks. - 9.4.2 Late Precambrian (635 Ma-600 Ma) volcanic rocks. - 9.4.3 Late Precambrian (635 Ma-c. 570 Ma) marine sedimentary rocks. - 9.4.4 Latest Precambrian terrestrial sedimentary rocks. - 9.4.5 Latest Precambrian (c. 570 Ma) volcanic rocks. - 9.5 Late Precambrian plutonic rocks. - 9.6 Cambro-Ordovician stratigraphy. - 9.7 Mid-Palaeozoic stratigraphy. - 9.8 Palaeozoic plutonic rocks. - 9.9 Mesozoic magmatism. - 9.10 Tectono-thermal history. - 9.11 Synthesis. - 9.11.1 Deep crust. - 9.11.2 The Burin Group. - 9.11.3 Volcanic and plutonic rocks. - 9.11.4 Sedimentary rocks. - 9.11. 5 Latest Precambrian rocks. - 9.11. 6 The Eocambrian-Palaeozoic record. - 9.11. 7 The Avalonian-Appalachian connection. - References. - 10 The Avalon Composite terrane of Nova Scotia. - 10.1 Introduction. - 10.2 Geological data. - 10.2.1 Mid/Late Proterozoic gneisses. - 10.2.2 Mid/Late Proterozoic platfonnal rocks. - 10.2.3 Late Proterozoic volcano-sedimentary rocks. - 10.2.4 Early Palaeozoic overstep sequences. - 10.3 Discussion. - References. - 11 The Avalon Zone of New Brunswick. - 11.1 Zone definition. - 11.2 Zone boundaries. - 11.3 Unit descriptions. - 11.3.1 Brookville Gneiss. - 11.3.2 Green Head Group. - 11.3.3 Martinon Formation. - 11.3.4 Early amphibolites? - 11.3.5 Late Precambrian granitoid plutons (Golden Grove suite). - 11.3.6 Coldbrook Group. - 11.3.7 Kingston Dyke Complex(? ). - 11.3.8 Late Precambrian (? ) mylonite zones. - 11.3. 9 'Eocambrian' succession. - 11.3.10 Saint John Group. - 11.4 Regional correlations. - References. - 12 Palaeomagnetic and tectonic constraints on the development of Avalonian-Cadomian terranes in the North Atlantic region. - 12.1 Introduction. - 12.2 Palaeomagnetic constraints on a late Precambrian plate reconstruction. - 12.2.1 The main cratons. - 12.2.2 The intervening terranes. - 12.2.3 Comparison with previous reconstructions. - 12.3 Tectonic synthesis. - References.