Age and origin of early Proterozoic dolerite dykes in South-West Greenland

Kalsbeek, Feiko; Taylor, Paul N.

doi:10.1007/bf00381553

Cited by 51 publications

(17 citation statements)

References 14 publications

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“…In South Greenland, rifting of the North Atlantic craton is poorly constrained by an Rb -Sr age of 2130 + 65 Ma (Kalsbeek & Taylor 1985) on doleritic dykes of the Iggavik suite (Berthelsen & Henriksen 1975) west of Midternaes (Fig. 3).…”

Section: South Margin Of the Archaean North Atlantic Cratonmentioning

confidence: 99%

Correlation of Archaean and Palaeoproterozoic units between northeastern Canada and western Greenland: constraining the pre-collisional upper plate accretionary history of the Trans-Hudson orogen

et al. 2009

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Section: South Margin Of the Archaean North Atlantic Cratonmentioning

confidence: 99%

Correlation of Archaean and Palaeoproterozoic units between northeastern Canada and western Greenland: constraining the pre-collisional upper plate accretionary history of the Trans-Hudson orogen

et al. 2009

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“…It is also important to note that dyke margins may be affected by crustal contamination but centres of dykes are little or un-contaminated (cf. Gill and Bridgewater, 1979;Kalsbeek and Taylor, 1986). Therefore, to minimize the possibility of crustal contamination, samples for the present study were collected from the centres of dykes and samples not containing inclusions/xenocrysts.…”

Section: Whole Rock Geochemistrymentioning

confidence: 99%

Sr–Nd isotope geochemistry of the early Precambrian sub-alkaline mafic igneous rocks from the southern Bastar craton, Central India

2009

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SummarySr-Nd isotope data are reported for the early Precambrian sub-alkaline mafic igneous rocks of the southern Bastar craton, central India. These mafic rocks are mostly dykes but there are a few volcanic exposures. Field relationships together with the petrological and geochemical characteristics of these mafic dykes divide them into two groups; Meso-Neoarchaean subalkaline mafic dykes (BD1) and Paleoproterozoic (1.88 Ga) sub-alkaline mafic dykes (BD2). The

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“…Crustal contamination is a common phenomenon during the emplacement of mafic magmas although the intensity of contamination may vary from nominal or absent to very high (Mohr, 1987). Previous studies have noted that the contamination process occurs more at the margins of the dykes (Gill and Bridgwater, 1979; Kalsbeek and Taylor, 1986). However, the degree of crustal contamination in dykes is definitely less, and sometimes even absent, in comparison to volcanic rocks (Tarney and Weaver, 1987).…”

Section: Discussionmentioning

confidence: 99%

Early Precambrian mafic dyke swarms from the Central Archaean Bastar Craton, India: geochemistry, petrogenesis and tectonic implications

Srivastava

Gautam

2011

Geological Journal

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The Archaean Bastar craton is known for the presence of different generations of mafic dykes. Less studied many NW-SE trending mafic dykes (intruded into the Archaean supracrustal rocks), encountered from the central part of the Bastar craton, are studied for their petrological and geochemical characteristics. There are many geological evidences which suggest emplacement of these mafic dykes in an intracratonic setting. Two distinct types of mafic dykes are recognized. Petrographically it is difficult to discriminate these two types. Many samples show metamorphic textures and amphibolites facies mineral assemblage but a few samples preserved original igneous texture and mineralogy. Major oxides show sub-alkaline thoeliitic basalt/basaltic andesite nature. High-Fe and high-Mg contents classify them as high-iron and highmagnesium tholeiites. They fall in the gabbronorite field on R1-R2 plot. Geochemical characteristics, particularly high-field strength and rareearth elements, clearly distinguished them into two types: Group 1 and Group 2 mafic dykes. When compared with well-studied mafic dyke swarms of the Southern Bastar craton, the Group 1 is recognized as Meso-Neoarchaean sub-alkaline mafic dykes (BD1-CBC) and the Group 2 as Neoarchaean-Palaeoproterozoic boninite-norite mafic dykes (BN-CBC). The boninite-norite nature of the second group is also corroborated through immobile trace element ratios. BD1-CBC dykes are characterized by a relatively higher concentration of HFSE and REE in comparison to BN-CBC dykes. Some extent of crustal contamination is observed in BN-CBC dykes but BD1-CBC dykes do not show any indication of crustal contamination. Trace element modelling suggest that BD1-CBC mafic dykes are derived from a melt originated through $20% melting of a depleted mantle source, whereas BN-CBC mafic dykes are probably derived from a high-Mg magma generated through $25% melting of a refractory mantle source. Both melts have undergone 30-40% olivine fractionation before the emplacement. Geochemistry also points out involvement of a plume in the genesis of these mafic dykes.

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Age and origin of early Proterozoic dolerite dykes in South-West Greenland

Cited by 51 publications

References 14 publications

Correlation of Archaean and Palaeoproterozoic units between northeastern Canada and western Greenland: constraining the pre-collisional upper plate accretionary history of the Trans-Hudson orogen

Correlation of Archaean and Palaeoproterozoic units between northeastern Canada and western Greenland: constraining the pre-collisional upper plate accretionary history of the Trans-Hudson orogen

Sr–Nd isotope geochemistry of the early Precambrian sub-alkaline mafic igneous rocks from the southern Bastar craton, Central India

Early Precambrian mafic dyke swarms from the Central Archaean Bastar Craton, India: geochemistry, petrogenesis and tectonic implications

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