Lithologic and geochemical composition of samples from the Circum Superior Belt, North America
Cobertura |
MEDIAN LATITUDE: 51.622304 * MEDIAN LONGITUDE: -91.348668 * SOUTH-BOUND LATITUDE: 46.094400 * WEST-BOUND LONGITUDE: -94.259000 * NORTH-BOUND LATITUDE: 55.843800 * EAST-BOUND LONGITUDE: -88.158900 |
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Data(s) |
23/03/2012
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Resumo |
The ca. 1880 Ma Circum-Superior Large Igneous Province (LIP) consists of a number of discontinuous segments known to cover a significant portion of the margin of the Superior Province craton in North America. New geochemical and isotopic data from western segments of this LIP support a common origin for the these segments and suggest that magmatism in the Lake Superior region may have been fed through the ~ 600 km long Pickle Crow dyke from a source north of the Fox River Belt in northeastern Manitoba. The Fox River Belt, Pickle Crow dyke and sections of the Hemlock Formation in the Lake Superior region possess trace element signatures which are similar to those of more recent oceanic plateaux. The Hemlock Formation displays a heterogeneous geochemical signature. This chemical heterogeneity can in part be explained by lithospheric contamination and possibly by source heterogeneity. The tectonomagmatic setting in which these igneous rocks were formed could have involved a mantle plume. Evidence supporting a plume origin includes high MgO volcanic rocks, high calculated degrees of partial melting and geochemical signatures similar to those of oceanic plateaux. |
Formato |
application/zip, 5 datasets |
Identificador |
https://doi.pangaea.de/10.1594/PANGAEA.778131 doi:10.1594/PANGAEA.778131 |
Idioma(s) |
en |
Publicador |
PANGAEA |
Direitos |
CC-BY: Creative Commons Attribution 3.0 Unported Access constraints: unrestricted |
Fonte |
Supplement to: Minifie, Matthew J; Kerr, Andrew C; Ernst, Richard E; Hastie, Alan R; Ciborowski, T Jake R; Desharnais, Guy; Millar, Ian L (2013): The northern and southern sections of the western ca. 1880 Ma Circum-Superior Large Igneous Province, North America: the Pickle Crow dyke connection? Lithos, 174, 217-235, doi:10.1016/j.lithos.2012.03.017 |
Palavras-Chave | #143Nd/144Nd; 143Nd/144Nd e; 147Sm/144Nd; 176Hf/177Hf; 176Hf/177Hf e; 176Lu/177Hf; Al2O3; Aluminium oxide; approximate numbers; Ba; Barium; Caesium; Calcium oxide; Calculated, PRIMELT2; Canada; Canada, Fox River Belt; CaO; Ce; Cerium; Chromium; Chromium(III) oxide; Co; Cobalt; Comm 2; Comm 3; Comm 4; Comment; Comment 2 (continued); Comment 3 (continued); Comment 4 (continued); Copper; Cr; Cr2O3; Cs; Cu; Degree of partial melting; description of thin section; Dy; Dysprosium; Elements, total; Er; Erbium; eruption temperature; Eu; Europium; Event; F deg part melt; Fe2O3; Fe2O3(T); FeO; Finnigan TRITON thermal ionization mass spectrometer (TIMS); Fo; Fo content of olivine in equilibrium with the melt; Forsterite; Fox_River_Belt; Ga; Gadolinium; Gallium; Gd; Hafnium; Hafnium 176/Hafnium 177; Hafnium 176/Hafnium 177, error; Hemlock_Formation; Hf; Ho; Holmium; ICP-MS, Inductively coupled plasma - mass spectrometry; Iron oxide, Fe2O3; Iron oxide, FeO; K2O; La; Label; Lanthanum; Latitude; LATITUDE; Lithologic unit/sequence; LOI; Longitude; LONGITUDE; Loss on ignition; Lu; Lutetium; Lutetium 176/Hafnium 177; Magnesium oxide; Manganese oxide; MC-ICP-MS VG Plasma P54; MgO; MnO; Na2O; Nb; Nd; Neodymium; Neodymium 143/Neodymium 144; Neodymium 143/Neodymium 144, error; Ni; Nickel; Nickel oxide; NiO; Niobium; Ol; Olivine; P2O5; Phosphorus oxide; Pickle_Crow; Potassium oxide; Pr; Praseodymium; Rb; Rock; Rock type; Rubidium; Samarium; Samarium 147/Neodymium 144 ratio; Sample code/label; Sample ID; Sc; Scandium; Silicon dioxide; SiO2; Sm; Sodium oxide; Sr; Strontium; Ta; Tantalum; Tb; T cal; Temperature, calculated; Terbium; Th; Thorium; Thulium; TiO2; Titanium oxide; Tm; total; U; Unit; Uranium; V; Vanadium; Y; Yb; Ytterbium; Yttrium; Zinc; Zirconium; Zn; Zr |
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Dataset |