Fragmentation processes and xenolith transport in a Proterozoic minette dyke, Grenville Province, Quebec

Article Abstract:

The Mesoproterozoic Rivard minette dyke, Grenville Province, Quebec, has undergone dyke-parallel fracturing due to the movement of low-velocity melts at deep crustal levels. The brittle-to-ductile deformation and big dense fragments in the dyke's xenoliths suggest turbulence and upward movement of magma. The xenoliths were probably formed by dyke wall fragmentation and delamination of the wall rock due to magma intrusion from the fractures. An increase in the xenolith level increased the velocity of the liquid-solid mixture, and promoted magma flow and xenolith suspension.

Quebec

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Geochemistry of the Grenville Dyke Swarm: role of plume-source mantle in magma genesis

Article Abstract:

The rocks of the Ma Grenville Dyke Swarm (GDS) of nearly 590 Ma in the south-eastern Canadian Shield are saturated, quartz tholeliites. Analysis of major and trace element data of samples of these transitional basalts for their mantle source and contamination of magma shows that GDS is most likely a synrift swarm, emplaced along a rift arm of Iapetan rrr triple junction, formed over a mantle plume. Its chemistry is in line with its derivation from a plume head, and most probably from magma coming from the cooler parts of the plume head.

Grenville, Ontario

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Coexisting K-rich alkaline and shoshonitic magmatism of arc affinities in the Proterozoic: a reassessment of syenitic stocks in the southwestern Grenville Province

Article Abstract:

Eight syenitic stocks from the Central Metasedimentary Belt of the southwestern Grenville Province in Quebec, Canada were reinvestigated. The study was aimed at describing the first recorded Proterozoic ultrapotassic, potassium-rich alkaline and shoshonitic rocks with arc affinities. The composition of the two rock series, shoshonitic and potassic alkaline, reflected the characteristics of the original igneous rocks, the magmatic source composition and the physical conditions during melting.

Magmatism, Island arcs

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