Bedrock geology of seaboard of Labrador between Domino Run and Hopedale, Newfoundland

Kranck, E. H.

doi:10.4095/123932

Cited by 9 publications

(4 citation statements)

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“…1963) was based on the position, "where schists lished a contrast between supracrustal rocks plus are followed by gneisses and granitic rocks," in the granitic intrusions in the north, and rocks which he interior of Labrador, and on the coast using described as paragneisses to the south. He also Kranck's (1953) boundary between Hopedale mapped a major shear zone south of the Benedict Gneiss and Domino Gneiss. It is now known that Mountains which he interpreted as a south-dipping this line approximately defines the boundary be-thrust.…”

Section: Introductionmentioning

confidence: 96%

The position of the Grenville Front in eastern and central Labrador

Gower¹,

Ryan²,

Bailey³

et al. 1980

Can. J. Earth Sci.

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Positions suggested for the Grenville Front in eastern and central Labrador span a 100 km wide belt. The criteria used by previous workers are reviewed and the conclusion drawn that the various attempts to define the Grenville Front as a single line are not in agreement because different field or laboratory parameters have been employed.On the basis of recent mapping, a Grenville Front Zone is proposed. The northern boundary is considered to be the northern limit of widespread brittle deformation. The southern boundary is located along a series of geological contrasts, generally the northern limit of well-banded gneisses. In places, the Grenville Front Zone has been telescoped by thrusts or high-angle reverse faults.

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Section: Introductionmentioning

confidence: 96%

The position of the Grenville Front in eastern and central Labrador

Gower¹,

Ryan²,

Bailey³

et al. 1980

Can. J. Earth Sci.

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“…The chronology of the rocks exposed along the seaboard of Labrador between Hopedale and Hamilton Inlet (KRANCK 1953, GANDHI et al, 1969 is strikingly similar to the chronology now established in Southwest Greenland. The supracrustal rocks of the Aillik series in the Makkovik Bay area correspond to the Ketilidian sediments and volcanics, and post-kinematic granite (Strawberry granite) in that same area gives a K/ Ar age of 1600 ± 34 m.y.…”

Section: North Americamentioning

confidence: 55%

K/Ar Age Determinations from the Precambrian of Denmark

Larsen¹

1971

raekke2

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K/Ar age determinations on granites and pegmatite from the island of Bornholm give results between 1255 and 1340 m.y. Ages between 1300 and 1500 m.y. are common in Scandinavia, Russia and North America. They are believed to represent a period of anorogenic plutonic activity.K/Ar age determinations on core samples from deep tests made in Jutland and on Fyn give acceptable results between 800 and 900 m.y. for the crystalline basement. This indicates a relation to the 900-1200 m.y. orogenic episode recorded in Southern Norway and in Central Europe.

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“…The lamprophyric carbonatites are also very similar to alnoites (VON ECKER-MANN, 1963 and 1967) although melilite has not been identified in these rocks. In particular, they closely resemble alnoitic dyke rocks termed aillikites in Labrador (KRANCK, 1953) and the possibility exists that the two groups of dykes were one prior to the onset of continental drift. GRASTY, RUCKLIDGE & ELDERS (1969) give age determinations of dykes on the Labrador coast which are all older than 500 m.y.…”

Section: Lamprophyric Carbonatitesmentioning

confidence: 88%

Plutonic nodules in lamprophyric carbonatite dykes near Frederikshåb, South-West Greenland

Walton¹,

Arnold²

1970

bullggu

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A swarm of thin NW-SE lamprophyric carbonatite dykes of Mesozoic age occurs south of Frederikshåb associated with a contemporaneous, parallel swarm of thick dolerites. Apart from local country rock material, inclusions in the lamprophyric carbonatites are mainly of the following types: 1) Single crystals of olivine which were probably mainly derived from the upper mantle. 2) Relatively unmodified garnet- and pyroxene-granulite nodules brought up from a lower crustal level. 3) Nodules, and single crystals, consisting mainly of hornblende and salite which are considered to have formed by metasomatic reaction between the carbonatite magma and mainly acid to intermediate lower crustal rocks, possibly at relatively low levels in the dykes. Hornblende shows various stages of growth from initially small, iron-rich crystals to larger, iron-poor crystals which have commonly replaced pyroxenes. The pyroxenes show a similar but less pronounced development. 4) Alkaline nodules which are again thought to have developed by metasomatic reaction between the magma and country rock inclusions, but possibly at higher levels in the dykes. 5) Phlogopite megacrysts which may be partly xenocrystal but which are thought to have mainly crystallised from the contaminated magma. Complete chemical analyses of lamprophyric carbonatites and partial analyses of individual minerals are presented.

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Bedrock geology of seaboard of Labrador between Domino Run and Hopedale, Newfoundland

Cited by 9 publications

References 0 publications

The position of the Grenville Front in eastern and central Labrador

The position of the Grenville Front in eastern and central Labrador

K/Ar Age Determinations from the Precambrian of Denmark

Plutonic nodules in lamprophyric carbonatite dykes near Frederikshåb, South-West Greenland

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