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NARROW
GeoRef Subject
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all geography including DSDP/ODP Sites and Legs
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Canada
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Eastern Canada
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Maritime Provinces
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Nova Scotia
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Yarmouth County Nova Scotia
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Yarmouth Nova Scotia (1)
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Meguma Terrane (1)
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Newfoundland and Labrador
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Ontario (1)
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Georgian Bay (1)
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North America
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Canadian Shield
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Grenville Province
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Central Metasedimentary Belt (1)
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Makkovik Province (2)
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geochronology methods
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Sm/Nd (1)
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geologic age
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Paleozoic
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Cambrian
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Upper Cambrian
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Goldenville Formation (1)
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Ordovician
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Lower Ordovician
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Tremadocian
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Halifax Formation (1)
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Silurian (1)
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Precambrian
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upper Precambrian
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igneous rocks
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igneous rocks
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Primary terms
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Canada
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Eastern Canada
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Maritime Provinces
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Nova Scotia
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Yarmouth County Nova Scotia
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Meguma Terrane (1)
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Newfoundland and Labrador
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metaplutonic rocks (1)
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metasedimentary rocks (1)
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metavolcanic rocks (1)
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metamorphism (2)
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North America
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Canadian Shield
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Grenville Province
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Makkovik Province (2)
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Great Lakes region (1)
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orogeny (2)
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paleogeography (2)
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Paleozoic
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Cambrian
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Upper Cambrian
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Goldenville Formation (1)
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Ordovician
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Lower Ordovician
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Tremadocian
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Halifax Formation (1)
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Silurian (1)
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Precambrian
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upper Precambrian
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Proterozoic
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Paleoproterozoic (2)
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tectonics (3)
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The Yellowknife greenstone belt and underlying Central Slave Cover Group, Slave craton, Canada: constraints and questions arising from a U–Pb dating study
The southwestern Grenville Province in Ontario consists of Paleoproterozoic and Mesoproterozoic rocks that formed along the southeastern margin of Laurentia during a significant period of growth of the North American continent. The area investigated consists of high-grade ortho- and paragneisses whose protoliths formed between 1500 and 1350 Ma. Geochemical and geochronological data from the rocks investigated point to a period of arc and back-arc magmatism along the Laurentian margin between ca. 1500 and 1450 Ma. A-type charnockites and granites are temporally and spatially associated with the arc rocks, and have compositions interpreted to indicate derivation from a tholeiitic basaltic underplate and from crustal melting, respectively. This interpretation implies that the arc underwent extension during part of its history. Between ca. 1450 and 1430 Ma, magmatism apparently ceased in the study area and was temporally associated with high-grade metamorphism in the back-arc region, possibly suggesting a change from an extensional to a compressional tectonic regime, although other interpretations are equally likely. Few data exist for the period after ca. 1430 Ma; however, a number of geochronological studies from nearby parts of the Grenville Province suggest that arc magmatism may have moved to a more outboard position on the continental margin. At ca. 1360 Ma, bimodal rhyolitic and basaltic magmatism suggests a return to an extensional tectonic regime. The geochemical data generally support, but suggest refinements to, previously proposed models for the evolution of the southeastern Laurentian margin in the Grenville Province that may be applicable to other parts of the margin.