La composition chimique d’une roche magmatique dépend de: . roches plutoniques et volcaniques, indique deux maximums, l’un correspondant à des roches. PREMIÈRE. PARTIE. CHAPITRE I. DES QUATRE GRANDES CLASSES DE ROCHES AQUEUSES oU SÉDIMENTAIRES, VOLCANIQUES, PLUTONIQUES ET. les roches volcaniques et plutoniques pdf. Quote. Postby Just» Tue Aug 28, am. Looking for les roches volcaniques et plutoniques pdf. Will be.
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The Kirkhill Fault strand is a fault 60 km long, now truncated at its western end by Triassic basin margin faults. The granite plutons are subalkaline to alkaline with the geochemical character of A-type granite Pe-Piper et al.
The Bass River block 8 The Bass River block Nance and Murphy consists of rohes series of fault slices of Neoproterozoic shelf siliciclastic sedimentary rocks Gamble Brook Formationtectonically juxtaposed with ocean-floor basalt and a thin cover of pelagic plutobiques rocks and fine-grained turbidites Folly River Formation: Donohoe and Wallace provided a synthesis and bibliography of earlier work, including Geological Survey of Canada work in the late ‘s by Kelley and Eisbacher, Some N—S faults of inferred earliest Carboniferous age appear to terminate against plutons cf.
As argued by Pe-Piper et al.
A series of granitic plutons with minor gabbro were emplaced in the Cobequid Shear Zone between — Ma and record progressive dextral transpression with north-vergent thrusting in the shear zone.
Such rapid changes in degree of deformation suggest that deformation was related to regional shear. Journal of Geodynamics, 19, pp.
Tectonic evolution of Fundy basin, Canada: Points chauds, Volcanisme, Rifting. These two highland areas are separated by Carboniferous rocks of the Stellarton Basin Fig. The petrology, geochemistry, mineralogy, and a detailed map of the felsic phases of the Wentworth plutonic complex, Cobequid Highlands, Nova Scotia. In the Bass River block,?
Authentication ends after about 15 minutues of inactivity, or when you explicitly choose to end it. Braided fluvial architecture within plutonique rapidly subsiding basin: The last significant motion on faults in the northern Cobequid Highlands was predominantly dip slip prior to deposition of the onlapping undeformed late Namurian Boss Point Formation Piper and Pe-Piper Fig.
Between these two prominent faults, in the transition zone, the deformation was accommodated by several faults including two shear zones within the western Pleasant Hills Pluton Pe-Piper et al.
les roches volcaniques et plutoniques pdf
Le granite est la roche plutonique la plus commune. These Neoproterozoic rocks form a geographic link between that part of the Avalon terrane outcropping in southern New Brunswick and the Avalonian rocks of the Antigonish Highlands and southern Cape Breton Island Fig. Let’s connect Contact Details Facebook Twitter.
We follow Murphy et al. Atlantic Geology, 29, pp. Seismic-reflection profiles show basement rocks dipping southward beneath Carboniferous sedimentary rocks for several kilometres south of the Cobequid Fault. Both biostratigraphic and radiometric data Dunning et al. Middleborough Formation Chandler et al. Geological Survey of Canada Open file34 p. Geological Survey of Canada Paperpp.
Les roches sont partout. Note that mappable units listed in Table 1 and shown on our 1: A rhyolite flow near the top of the formation has yielded a U-Pb zircon age of Ma Dunning et al. Il constitue la plus grande The field notes and plotting sheets of Donohoe and Wallace are available through the N.
U-Pb ages from Doig et al. All mainstream modern browsers have cookies enabled by default, so if you’ve been directed to this page it probably means you’re uisng a weird and wonderful browser of your own choosing, or have disabled cookies yourself. Much of the granite of the Wentworth pluton within a few kilometres of the Folly Lake gabbro either cross-cuts the gabbro or shows textures indicating the co-existence of immiscible mafic and felsic magmas Pe-Piper et al.
Detailed studies of selected areas are reported in fourteen B.
Les Roches Magmatiques – scribd. BoxDartmouth, N. The voluminous rhyolite in the Fountain Lake Group has been dated as latest Devonian or earliest Carboniferous and is widespread as clasts in the latest Devonian — earliest Carboniferous Nuttby Formation see below.
The stratigraphy and geochemistry of late Devonian to early Carboniferous volcanic rocks of the northern Ft peninsula, Cobequid Highlands, Nova Scotia. Contrasts in late Precambrian — early Paleozoic tectonothermal history between Avalon composite terrane sensu stricto and other possible peri-Gondwanan terranes in southern New Brunswick and Cape Breton Island, Canada.
Peters area, southern Cape Breton island, Nova Scotia. We have in general followed their stratigraphic nomenclature. The Fountain Lake Group represents the extrusive equivalent of this plutonism.
Geological Survey of Canada Paper E, pp.
Microtextures des roches magmatiques et métamorphiques
Display large image of Figure 2 Fig. A activation email has been sent to you. The emplacement of these plutonic rocks thus straddles the Devonian—Carboniferous boundary. The fault-bound northern margin of the Cobequid Highlands, with minor overstep of upper Carboniferous rocks of the Cumberland Basin, is marked by the Spicer Cove Fault in the western Cobequid Highlands Ryan et al. Within the highlands, the Rockland Brook Fault separates two contrasting blocks of Neoproterozoic rocks, the Bass River block to the south and the Jeffers block to the north Fig.
Information on mineral localities was presented by Donohoe and by Ervine Donohoe and Wallace proposed a plutoniquues of informal names for the plutons; we generally follow this nomenclature, but use the term “Wentworth Pluton” Fig.
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Both the Wilson Brook and Portapique River formations are folded and penetratively cleaved to a varying degree. These ages are consistent with a U-Pb age of Ma on a rhyolite in the lower part of the formation south of New Annan Dunning et al. Geological Magazine,pp. The Cobequid Highlands include the only thick early Carboniferous basalt succession in Atlantic Canada, overlying several kilometres rroches latest Devonian rhyolite.