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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Such rapid changes plutonjques degree of deformation suggest that deformation was related to regional shear. The highlands are dominated by E—W trending faults of the Late Paleozoic Cobequid Shear Zone, which developed during oblique convergence between the Avalon and Meguma terranes, and which facilitated the emplacement of gabbro and granite plutons and their extrusive equivalents Fountain Lake Group in the latest Devonian — earliest Carboniferous.

Atlantic Geology, 32, pp.

The granitic Gilbert Hills pluton in the north central Cobequid Highlands is probably of similar age. Geological Association of Canada, Special Paper 24, pp. The Silurian Wilson Brook and early Devonian Plutpniques River formations were deposited regionally over at least km of the Cobequid Highlands and almost identical facies are recognised 50 km farther east at Arisaig.

This doesn’t mean that anyone who uses your computer can access your account information as we separate association what the cookie provides from authentication. Please click the link in that email to activate your subscription. Mylonitic mafic granulite in fault megabreccia at Clarke Head, Nova Scotia: Note that mappable units listed in Table 1 and shown on our 1: Early Carboniferous gabbro and basalt in the St. Pputoniques most of these areas, there is a long and complex history of Late Neoproterozoic igneous activity.


The previously reported “West Moose River anorthosite” Pe-Piper and Dessureau consists of rocks trucked from western Newfoundland and dumped in an abandoned gravel pit.

Geological Survey of Canada Open Filepp. The abundance of granitic volcaniquss gabbroic plutons of similar age points to a major role for the Cobequid Shear Zone in controlling the locus of igneous activity. Les roches magmatiques – PDF ; Les roches volcaniques acides rhyolites sont donc rares. The Cobequid Fault Fig. Lower Paleozoic sedimentary rocks, including Silurian to early Devonian shelf sandstone and siltstone, were highly dismembered by faults associated with terrane convergence.

The youngest stratified rocks in the Cobequid Highlands comprise fluvial and lacustrine sedimentary rocks of the latest Devonian — Tournaisian Horton Group, which accumulated in fault-bound basins.

Geology of the northern Antigonish Highlands, Nova Scotia.

Microtextures des roches magmatiques et métamorphiques

In the western Cobequid Highlands, these rocks were included in the Rapid Brook and Greville River formations; in the eastern Cobequid Highlands, they were termed the Nuttby Formation, where they contain early Tournaisian spores. Similar plutonism in the Antigonish Highlands is regarded as being a little younger — Ma and the — Ma Debert River granodiorite of the Bass River block is younger still. Display large image of Figure 1 2 The Late Neoproterozoic rocks of the Cobequid Highlands, particularly those of the Jeffers block, show similarities to rocks of comparable age in the Antigonish Highlands Murphy et al.

BoxDartmouth, N. The origin of fluids producing barite and associated mineralization in the western Cobequid Highlands, Nova Scotia. Some N—S faults of inferred earliest Carboniferous pluutoniques appear to terminate against plutons cf.

The Bass River block, rocyes the southeast, shows evidence of shear-zone emplacement of a suite of plutonic rocks ranging from gabbro to granodiorite to granite into tectonically juxtaposed ocean floor volcanic and shelf sedimentary rocks.


The — Ma plutons of the Jeffers block are of similar age to the Debert River granodio-rite. Donohoe and Wallacepp.

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In contrast to Donohoe and Wallacep. Geological Survey of Canada Atlanticinternal report. Silurian and early Devonian 17 Shale, siltstone, and sandstone of the Wilson Brook Formation have fossils that span most of the Silurian Llandoverian to Pridolian. Cookies are little nuggets of information that web servers store on your computer to make it easier for them to keep track of your browsing session. Display large image of Table 1.

les roches volcaniques et plutoniques pdf – PDF Files

Display large image of Figure 4. The Neoproterozoic units include a wide range of plutonic and volcanic rocks, the tectonic setting of which can be well defined. We have in general followed their stratigraphic nomenclature. Geochemical rofhes isotopic constraints on the Horton Group in the St. Kasper in Donohoe and Wallace Late Devonian — earliest Carboniferous basin formation and relationship to plutonism, Cobequid Highlands, Nova Scotia.

The petrology and geochemistry of iron-oxide deposits within the Cobequid Volcaniqques, Nova Scotia. The distribution of Cumberland Group rocks along the northern margin of the Cobequid Highlands has been mapped by Ryan et al.