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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les roches volcaniques et plutoniques pdf
A little later, volcanuques ca. Nova Scotia Depart ment of Mines and Energy. These two contrasting formations imply original deposition in distant basins now juxtaposed by thrusting and strike-slip motion. 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.
Géologie du Massif central — Wikipédia
The field notes and plotting sheets of Donohoe and Wallace are available through the N. La nature des roches ovlcaniques et le lien avec leur formation ; 12 nov.
The main phase of plutonism in the Cobequid Highlands includes granite plutons of the western Cobequid Highlands and their associated gabbro Pe-Piper ; Koukouvelas et al. The distribution of Cumberland Group rocks along the northern margin of the Cobequid Highlands has been mapped by Ryan et al.
Kasper in Donohoe and Wallace Geological Association of Canada, Special Paper 24, pp. Display large image of Figure 5 25 The Falls Formation, consisting of poorly sorted conglomerate and coarse sandstone Ryan et al. Atlantic Geology, 27, pp. The petrology and geochemistry of iron-oxide deposits within the Cobequid Highlands, Nova Scotia. The northern margin of the Cobequid Highlands is largely fault-bound, with the Spicers Cove Fault in the west and a series of unnamed faults in the east Durlingwith minor overstep of upper Carboniferous rocks of the Cumberland Basin Fig.
Chronology of Devonian to early Carboniferous rifting and igneous activity in southern Magdalen Basin based on U-Pb zircon dating.
The Portapique River section: The principal deformation and metamorphism took place during Late Neoproterozoic transpressional motion on the Rockland Rochhes Fault, when the rocks underwent thermo-mechanical softening as a consequence of emplacement of the Frog Lake gabbro and Debert River granodiorite Pe-Piper et al.
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. Both biostratigraphic and radiometric data Dunning et al. Atlantic Geology, 32, pp. These units have all yielded ages of to Ma by U-Pb on zircon Doig et al. Note that our thickness estimates for vplcaniques Fountain Lake Group are conservative and based on reasonably continuous sections in which large scale fault or fold repetition can be excluded: Canadian Journal of Earth Sciences, 28, pp.
Smaller intrusive bodies in this area have been termed the River John gabbro, tonalite and granodiorite units Roched et al.
Mid Tournaisian early Tn3 spores were identified in the upper part of the formation in the Scotsburn 1 well Utting volcaniqued al. Some N—S faults of inferred earliest Carboniferous age appear to terminate against plutons cf.
Geological Survey of Canada Atlanticinternal report. This Neoproterozoic lineament was reactivated in the central Cobequid Highlands, but not in the extreme eastern Cobequid Highlands, where late Paleozoic motion was taken up on the Cobequid and Millsville faults Fig.
The Cobequid Fault Fig. New U-Pb zircon ages and the duration and division of Devonian time. Magmatic significance of the relationships between the mafic and felsic phases of the Folly Lake pluton, Cobequid Highlands, Nova Scotia.
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Fault reactivation within Avalonia: It is cut by minor late granite dykes at several localities: Both formations are known only within the Jeffers Block, but are widely distributed in relatively small inliers from north of Parrsboro in the west to Earltown in the west.
Late Devonian — Early Carboniferous plutonic rocks 27 Much of the Cobequid Highlands is underlain by plutonic rocks of latest Devonian to earliest Carboniferous age. Nd and Pb isotope data show that all the Cobequid Shear Zone granites appear derived from melting of crust compositionally similar to Neoproterozoic granodiorite Pe-Piper and Piper b. The conformably overlying 1.
The emplacement of these plutonic rocks thus straddles the Devonian—Carboniferous boundary. The Silurian Wilson Brook and early Devonian Portapique 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. Geological Association of Canada Special Paper 41, pp.
Marys basin, Nova Scotia.