2 edition of Regional geochemistry in the superior province of the Canadian Shield found in the catalog.
Regional geochemistry in the superior province of the Canadian Shield
Christopher F Blain
|Statement||Christopher F. Blain.|
|The Physical Object|
|Pagination||2 v. :|
The boundary between the PB and the APB to the southeast, the ABT, is most clearly delineated in the eastern half of the province. It is the locus of major crustal delamination along which high‐grade, mostly middle Proterozoic, polycyclic terranes were tectonically transported northwest toward and onto the PB. Lithium isotope geochemistry and origin of Canadian shield brines. Bottomley DJ(1), Chan LH, Katz A, Starinsky A, Clark ID. Author information: (1)Canadian Nuclear Safety Commission, Slater St., Ottawa, Ontario, Canada K1P 5S9. [email protected]
Of the current or past-producing 'gold-only' mines in the Superior Province of the Canadian Shield which have produced more than , tons of ore, the 33 mines which have produced one million ounces or more of gold have accounted for over 84o/o of the total production of million ounces. Geological History of Canada Laurentia, which makes up the core of North America, is the largest and arguably the oldest of Earth’s cratons (regions of stable ancient crust). Some of the rocks are over 4 billion years old, and Laurentia has been together in its present form for the last billion years.
Two main geological provinces of the Canadian Shield are represented in Ontario. The Superior Province and autochthonous cover sequences underlie approximately 80% of the province of Ontario, distributed mainly across the north and northwest. The Grenville Province, exposed in the southeast, and its autochthonous cover, make up the remainder. Geochemistry is the study of the chemical composition of Earth and its rocks and minerals. In order to determine the chemical composition of the landscape, the Ontario Geological Survey undertakes sampling programs across the province that target a variety of materials.
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The Superior Craton is a stable crustal block covering Quebec, Ontario, and southeast Manitoba in Canada, and northern Minnesota in the United is the biggest craton among those formed during the Archean period. A craton is a large part of the Earth's crust that has been stable and subjected to very little geological changes over a long time.
The size of Superior Craton is about. Regional geochemistry is the study of the spatial variation in the chemical composition of materials at the surface of the Earth, on a scale of tens to thousands of ant parameters to consider when designing or evaluating a geochemical survey are: Areal extent of the survey; Sampling density.
Because major element geochemistry of the rocks was modified during ore- forming processes and later by several episodes of metamorphism and tectonism, the present alteration minerals merely reflect the cumulative effect(s) of these episodes and are often misleading in the identification of the protoliths.
The Canadian Shield, also called the Laurentian Plateau, or Bouclier canadien (French), is a large area of exposed Precambrian igneous and high-grade metamorphic rocks (geological shield) that forms the ancient geological core of the North American continent (the North American Craton or Laurentia).Composed of igneous rock resulting from its long volcanic history, the area is covered by a.
The timing of lode-gold and rare-element-pegmatite mineralization within the Superior Province corresponds closely with metamorphic evolution; it is consistent with models whereby gold-bearing fluids and pegmatite-forming melts develop, in part, as a result of.
The southeastern Superior Province of the Canadian Shield preserves a very complete record of the accretion and deformation of juvenile crust during a Ma period, Ma through Ma. Other articles where Superior province is discussed: North America: The Canadian Shield: to the northeast, and the Superior craton to the south of the intervening nonrigid Churchill province, which may be composite in origin.
The structural grain of the cratons is truncated at their margins, suggesting that they originated by the fragmentation of larger continents that formed more than Tectonic map of North America, showing location of the Archean Superior Province at the core of the Canadian Shield (after Hoffman, ).
Unlabelled white areas are knowledge gaps due to lack of. the western Superior Province of the Canadian Shield towards the end of the Ma Kenoran event (McCrank et al.
; Davis et al. ; Stone et al. It is a relatively undifferentiated and partly foliated porphyritic granite-granodiorite con sisting, like many other Archean batholiths, of broadly related but not sequentially.
Distribution and petrogenesis of lithium pegmatites 56. *ov,N P E G M A T I TES BOUNDARIES ^0*PALEOZOIC COVER ^^ TECTONIC LINEAMENTS BORDER ' ^y SUB PROVINCES SUBPROVINCES 1 GODS LAKE 2BERENS RIVER 3 UCHI LAKE 4 ENGLISH RIVER 5 WABIGOON 6QUETICO 7 WAWA Be «Li « / CAT LAKE W I N N I P E G R.
DISTRICT 48 Fig. Tabulated data on samples: US National Technical Information Service Rept PB/2 60 p Segerstrom K and Weisner R C,Mineral resources of areas adjacent to the Cloud Peak Primitive Area, Wyoming: US Geol Survey Open-file Rept 69 p Seward T M,Equilibrium and oxidation potential in geothermal waters at Broadlands, New Zealand.
His PhD thesis was ‘Lake sediment geochemistry in the Superior province of the Canadian Shield.’ In conjunction with colleagues at the Geological Survey of Canada, this work evolved to both regional and follow-up geochemical surveying of the Canadian Shield under the Uranium Reconnaissance Program.
Geochemical Provinces some regions and areas characterized by the predominance of certain chemical elements (in igneous rock termed “specialization” of a chemical element) and a lack of others.
Geochemical provinces appear as a deviation from the ratios of the mean contents of chemical elements in the earth’s crust; the greater the deviation, the.
Geology and mineral deposits of the Superior Province of the Canadian Shield; An overview of Grenville Province geology, Canadian Shield; Synopsis of Precambrian fossil occurences in North America.
Maps: Geological map of Canada (Map A) Archaean mineral deposits of the Superior Province (Map A) Residual total field magnetic map of the. Geochemistry, Mineralogy, Volcanology. Geochemistry; comparisons between the various interpretations advanced to explain the crustal structure in the Lake Superior province of the Canadian Shield.
It was hoped that such a compilation would facilitate the very necessary task of distinguishing the points of general agreement from the.
Abstract. At least 12 granulite occurrences, ranging in size from a few 10’s tokm2, are exposed in the Archean Superior Province. Primary lithotectonic subdivision of the Superior Province into linear volcano-plutonic and metasedimentary gneiss belts has led to interpretation of these components as magmatic arcs and accretionary prisms respectively, assembled in the interval between.
Conceptual Models In Exploration Geochemistry: The Canadian Cordillera And Canadian Shield Paperback – January 1, by P.M. Bradshaw (Author) See all 3 formats and editions Hide other formats and editions.
Price New from Author: P.M. Bradshaw. Government geoscience stimulates mineral exploration in the superior province, Northern Quebec. Geology and mineral deposits of the Superior Province of the Canadian Shield, in Geology of the Precambrian Superior and Grenville Provinces and Precambrian Fossils in North America, Lucas, S.B.
and St-Onge, M.R., co-ord.: Geological Survey. The Karelia and Belomorian Provinces include a large number of generally NNW-trending greenstone belts, whose tectonic settings of origin may include an oceanic plateau, island arc and/or continental rift. The ages of volcanic rocks in these greenstone belts vary from to Ga.
Clowes, Ronald Wyman, Derek and Kerrich, Robert Mantle plume – volcanic arc interaction: consequences for magmatism, metallogeny, and cratonization in the Abitibi and Wawa subprovinces, CanadaThis article is one of a series of papers published in this Special Issue on the theme Lithoprobe — parameters, processes, and the evolution of a continent.
Cambridge Core - Mineralogy, Petrology and Volcanology - Large Igneous Provinces - by Richard E. Ernst.Corfu F.
& Stott G.M.,U-Pb geochronology of the central Uchi Subprovince, Superior Province, Canadian Journal of Earth Sciences, 30, – Corfu F.
& Stott G.M.,Hf isotopic composition and age constraints on the evolution of the Archean central Uchi Subprovince, Ontario, Canada, Precambrian Research, 78, 53–Full Text; PDF ( K) PDF-Plus ( K) Suppl.
data; U–Pb geochronology and trace element composition of zircon from the Horseshoe Lake greenstone belt, Superior Province, Canada: implications for the tectonic and metamorphic history 1. C.J. Kelly,* a D.A.
Schneider, a M.-È. Lajoie, a S.E. Jackson, b C.R. McFarlane c a Department of Earth and Environmental Sciences, University of Ottawa.