Abstract
Summary The trace element chemistry, including the rare earth elements, of two Proterozoic metavolcanic sequences in the Central Metasedimentary Belt of the Grenville Province is presented. The older Tudor suite is a bimodal mafic-silicic sequence comprising dominant tholeiitic basalts with minor rhyodacites. The younger Turriff metavolcanic sequence, is also a bimodal mafic-silicic series made up predominantly of tholeiitic basalts with some calcalkaline andesites and minor rhyolites. In each suite the tholeiitic basalts and the felsic rocks were formed by fractional crystallization of mafic magmas formed by partial melting of enriched (spinel) lherzolite source materials. The Turriff andesites are considered to have formed by fractional crystallization of a parental basaltic andesite produced by partial melting of an eclogite source. Both suites are enriched in light rare earth elements (LREE), heavy rare earth elements (HREE), and high field strength elements (HFSE). This enrichment is interpreted as resulting largely from metasomatism of the sub-continental lithosphere sources. The two sequences are interpreted as having erupted in a marginal basin formed by rifting of the continental crust. Comparisons are made with similar Proterozoic volcanic sequences from the southwestern USA and with Mesozoic and Quaternary suites formed in marginal basins in central and southern Chile.
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