Nouvelles propositions pour la lithostratigraphie du Brioverien (Proterozoique superieur) et pour l'evolution geodynamique cadomienne en baie de Saint-Brieuc (Massif Armoricain)

Rabu, D.; Chauvel, Jean-Jacques; Chantraine, J.

doi:10.2113/gssgfbull.s7-xxv.4.615

Cited by 24 publications

(34 citation statements)

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“…These are exposed in the south of the Baie de Saint-Brieuc (Lanvollon Formation, Rabu et al, 1982Rabu et al, , 1983, along the southern margin of the North Trégor batholith (Spilites de Paimpol, Auvray, 1979) and north of Coutances (Dupret et al, 1985) (Fig. 3).…”

Section: Saint-brieuc Terranementioning

confidence: 99%

“…An acid sheet within the Spilites de Paimpol has yielded a Pb-Pb single zircon evaporation age of 610 ± 9 Ma (Egal et al, this volume). The Brioverian volcanic sequences are overlain conformably by sandstone sequences that were deposited from turbidity currents (Ryan, 1973;Squire, 1974;Denis and Dabard, 1988;Rabu et al, 1983;. Petrographic analysis of clast types together with sandstone geochemistry imply a mixed source region comprising volcanic arcs and metamorphic basement (Denis and Dabard, 1988).…”

Section: Saint-brieuc Terranementioning

confidence: 99%

“…As a result, earlier Cadomian geologic relationships are largely preserved intact. A large part of the Cadomian belt of the North Armorican Massif comprises Neoproterozoic supracrustal sequences that have been collectively termed the "Brioverian succession" (Barrois, 1895(Barrois, , 1896(Barrois, , 1908Graindor, 1957;Cogné, 1962;Le Corre, 1977;Rabu et al, 1982Rabu et al, , 1983Chantraine et al, 1982Chantraine et al, , 1988. Small areas of Mesoproterozoic basement occur on Guernsey and Sark, at La Hague, and in the Trégor region ( Fig.…”

Section: Introductionmentioning

confidence: 99%

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Neoproterozoic evolution of an active plate margin: North Armorican Massif, France

Strachan¹,

D’Lemos²,

Dallmeyer³

1996

Special Paper 304: Avalonian and Related Peri-Gondwanan Terranes of the Circum-North Atlantic

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The Neoproterozoic Cadomian orogenic belt of the North Armorican Massif, France, records the amalgamation of calc-alkaline magmatic-arc complexes and marginal basin successions along an active plate margin peripheral to the Gondwanan craton. Subduction-related magmatism and associated tectonothermal activity spans the period ca. 700-540 Ma. The Cadomian orogen is divided into tectonic units that were amalgamated at a late stage in the orogeny, mainly as a result of strike-slip displacements. There is no evidence for major crustal thickening and associated high-pressure metamorphism. It is therefore unlikely that Cadomian orogenesis resulted from continent-continent collision. Mesozoic-Cenozoic active plate margins such as the Andes and the East Indies that are characterized by prolonged periods of ocean-continent convergence may provide appropriate analogies for the evolution of the Cadomian orogen. Tectonic processes within such active plate margin settings are controlled by various parameters, including dip of the subducting slab, angle of plate convergence, and convergence velocity across the subduction zone. The tectonic and magmatic evolution of the Cadomian belt was likely controlled by combinations of these factors.

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Section: Saint-brieuc Terranementioning

confidence: 99%

Section: Saint-brieuc Terranementioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Neoproterozoic evolution of an active plate margin: North Armorican Massif, France

Strachan¹,

D’Lemos²,

Dallmeyer³

1996

Special Paper 304: Avalonian and Related Peri-Gondwanan Terranes of the Circum-North Atlantic

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“…Several units succeed one another in a unique sedimentary cycle which includes an important episode of volcanism (Rabu et al 1983). Volcanic rocks are present on both sides of the St Brieuc Bay (Lanvollon to the W and Hillion to the E) and are composed of thick lava flows which are locally pillowed (Pointe Roselier).…”

Section: Brioverian Supracrustal Rocksmentioning

confidence: 99%

“…A geochemical study of trace elements shows that the rocks have characteristics of a back-arc tholeiite association . One Cadomian orogenic cycle has been identified (Rabu et aL 1983) and has been dated by the associated plutonism (granodiorite of St Quay Portrieux) between 585 and 595 Ma (Vidal et al 1972).…”

Section: Brioverian Supracrustal Rocksmentioning

confidence: 99%

Plutonism and volcanism related to the pre-Arenig evolution of the Caledonide-Appalachian orogen

Rankin

Furnes

Bishop

et al. 1988

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Summary Igneous activity younger than 1 Ga related to crustal extension characterizes the western part of the orogen from N America to Scotland in the Laurentian plate and the eastern part of the orogen in Scandinavia in the Baltic plate. Sub-aerial tholeiites, locally with alkalic rhyolites at embayments, and accompanying mafic dyke-swarms indicate late Proterozoic continental rifting; oceanic tholeiites followed. Iapetus oceanic crust is preserved in ophiolites obducted to the W in Laurentia and to the E in Baltica. Ensimatic island arcs developed locally in late Cambrian and early Ordovician in Scandinavia were broadly coeval with plutonic rocks intruding continental-shelf sediments during the late Finnmarkian deformation in northern Norway. E of the Iapetus suture in N America, southern Britain and northern France many of the igneous rocks of the accreted terranes underwent or were generated during a late Proterozoic orogeny (Avalonian or Cadomian). Locally fossiliferous lower Cambrian strata rest unconformably on calc-alkaline Avalonian or Cadomian granites. Type I, or cratonal, terranes formed the rifted margins of the Iapetus Ocean. Type II, or accreted, terranes appear not to have been part of the Iapetus rifting cycle and are not now tied stratigraphically to any large cratonal masses. Type II terranes terminate northward against the projection of Tornquist’s line which may have originated in the late Proterozoic as the southern rifted margin of Baltica.

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Cadomian terranes in the North Armorican Massif, France

Strachan¹,

Roach²,

Treloar³

1990

Avalonian and Cadomian Geology of the North Atlantic

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Nouvelles propositions pour la lithostratigraphie du Brioverien (Proterozoique superieur) et pour l'evolution geodynamique cadomienne en baie de Saint-Brieuc (Massif Armoricain)

Cited by 24 publications

References 0 publications

Neoproterozoic evolution of an active plate margin: North Armorican Massif, France

Neoproterozoic evolution of an active plate margin: North Armorican Massif, France

Plutonism and volcanism related to the pre-Arenig evolution of the Caledonide-Appalachian orogen

Cadomian terranes in the North Armorican Massif, France

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