Tectonic setting and regional correlation of Ordovician metavolcanic rocks of the Casco Bay Group, Maine: evidence from trace element and isotope geochemistry

Ordovician metamorphic rocks of the Casco Bay Group are exposed in an approximately 170 km long NE-trending belt (Liberty-Orrington belt) in southern and south-central Maine. Geochemical analysis of rocks within the Spring Point Formation (469±3 Ma) of the Casco Bay Group indicate that it is an asse...

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Veröffentlicht in:	Geological magazine 2004-03, Vol.141 (2), p.125-140
Hauptverfasser:	WEST, DAVID P., COISH, RAYMOND A., TOMASCAK, PAUL B.
Format:	Artikel
Sprache:	eng
Schlagworte:	absolute age amphibolite facies Appalachians back-arc basins Basalt basalts basins Canada Cape Elizabeth Formation Casco Bay Group chemical composition Continental crust continental margin Continental margins correlation crust dates Diamond Island Formation Eastern Canada facies Gander Zone Geochemistry Iapetus ICP mass spectra igneous and metamorphic rocks igneous rocks intrusions island arcs isotope ratios isotopes Liberty-Orrington Belt mafic composition magmas Maine major elements mass spectra metals Metamorphic rocks metamorphism metavolcanic rocks mineral composition neodymium North America Norumbega fault zone Ocean basins Ordovician Original Article paleoenvironment paleogeography Paleozoic Petrology Plate tectonics plutons radioactive isotopes rare earths Rifting rock, sediment, soil samarium sampling Scarborough Formation Sm-147/Nd-144 spectra Spring Point Formation stable isotopes subduction tectonics Trace elements U/Pb United States Volcanic rocks Volcanoes
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