Correlation of two Helikian peralkaline granite – volcanic centres in central Labrador

Recent mapping in central Labrador has resulted in the recognition and correlation of two Neohelikian peralkaline silicic igneous centres. The Flowers River igneous suite is circular in shape, covers an area of approximately 1720 km2, and consists of undeformed comenditic granite in contact with extrusive equivalent porphyry, felsite, tuff, and breccia. The Letitia Lake volcanic complex has been deformed by the Grenvillian Orogeny into an elliptical structure that covers approximately 450 km2. The complex consists of comenditic granite and syenite of the Arc Lake intrusive suite and related porphyry, rhyolite, tuff, and volcanogenically derived sediments of the Letitia Lake Group. Undersaturated aenigmatite–nepheline gneisses and syenites of the Red Wine alkaline complex are associated in space and time with the peralkaline silicic rocks of the Letitia Lake complex. The two centres are separated by 175 km and are an integral part of a Neohelikian period of uplift and continental rifting that involved form...

[1]  K. Collerson.  Geochemistry and Rb-sr geochronology of associated proterozoic peralkaline and subalkaline anorogenic granites from Labrador , 1982 .

[2]  B. Fryer,et al.  Volatile control of contrasting trace element distributions in peralkaline granitic and volcanic rocks , 1981 .

[3]  C. Gower,et al.  The position of the Grenville Front in eastern and central Labrador , 1980 .

[4]  R. F. Emslie.  Anorthosite massifs, rapakivi granites, and late proterozoic rifting of north America , 1978 .

[5]  R. F. Emslie.  Elsonian magmatism in Labrador: age, characteristics and tectonic setting , 1978 .

[6]  W. Loveridge,et al.  Rubidium-strontium isotopic age studies report 2 (Canadian Shield) , 1978 .

[7]  R. E. Meyers,et al.  The Harp dikes and their relationship to the Helikian geological record in central Labrador , 1977 .

[8]  A. B. Blaxland,et al.  Chronology of the Red Wine alkaline province, central Labrador , 1977 .

[9]  B. H. Baker,et al.  Compositional changes during crystallization of some peralkaline silicic lavas of the Kenya rift valley , 1977 .

[10]  J. Winchester,et al.  Geochemical discrimination of different magma series and their differentiation products using immobile elements , 1977 .

[11]  A. Streckeisen.  To each plutonic rock its proper name , 1976 .

[12]  R. Macdonald,et al.  Fluorine and chlorine in peralkaline liquids and the need for magma generation in an open system , 1975, Mineralogical Magazine.

[13]  J. Myers.  Cauldron Subsidence and Fluidization: Mechanisms of Intrusion of the Coastal Batholith of Peru into Its Own Volcanic Ejecta , 1975 .

[14]  J. Gittins,et al.  Petrology of the Red Wine alkaline complexes, central Labrador and a comparison with the Ilimaussaq Complex, southwest Greenland , 1975 .

[15]  B. A. Greene.  An Outline of the Geology of Labrador , 1974 .

[16]  R. Macdonald.  Nomenclature and petrochemistry of the peralkaline oversaturated extrusive rocks , 1974 .

[17]  R. F. Martin.  Role of water in pantellerite genesis , 1974 .

[18]  K. Currie.  The Red Wine-Letitia alkaline province of Labrador , 1973 .

[19]  F. C. Taylor.  A Revision of Precambrian Structural Provinces in Northeastern Quebec and Northern Labrador , 1971 .

[20]  R. B. Scott.  Alkali Exchange during Devitrification and Hydration of Glasses in Ignimbrite Cooling Units , 1971, The Journal of Geology.

[21]  R. Macdonald,et al.  Chemical variation within three alkaline complexes in South Greenland , 1971 .

[22]  D. C. Noble,et al.  Loss of halogens from crystallized and glassy silicic volcanic rocks , 1967 .

[23]  J. E. Everett,et al.  The fit of the continents around the Atlantic , 1965, Philosophical Transactions of the Royal Society of London. Series A, Mathematical and Physical Sciences.