The geochemistry and petrogenesis of the Paleoproterozoic du Chef dyke swarm, Québec, Canada

Late Cretaceous tectono–magmatic event in Songliao Basin, NE China: New insights from mafic dyke geochronology and geochemistry analysis

“…The enrichment of incompatible elements (e.g., K, Ti, Rb, Ba, Th, U, and REEs; Figure ), high Rb/Sr (CHUR = 0.031), and low Sm/Nd (CHUR = 0.299) ratios all show an enriched mantle origin of the mafic dykes (Brownlow, ). The dykes have similar characteristics with du Chef dyke swarm that was derived through partial melting of an enriched region of the mantle in Canada (Ciborowsk, Kerr, McDonald, Ernst, & Hughesa, ) and are different from mafic dyke swarm of the eastern Dharwar Craton in India derived through partial melting of depleted mantle (Srivastavaa, Jayanandab, Gautama, Gireeshb, & Samal, ).…”

The Early Proterozoic Matachewan Large Igneous Province: Geochemistry, Petrogenesis, and Implications for Earth Evolution

“…12). FC models do not predict the presence of, or changes in, the magnitude of the Nb-Ta and Ti anomalies observed in the majority of the Matachewan LIP suites (Ciborowski et al, 2014). Increasing normalised LREE/HREE ratios are predicted by both the FC and AFC models, though the rate of increase is greater for AFC models and also fits the Matachewan LIP data more convincingly.…”

Generation of hydrous-carbonated plumes in the mantle transition zone linked to tectonic erosion and subduction

“…1 Ga was probably induced by a relatively "dry" huge superplume as it was accompanied by numerous swarms of mafic dikes found in Siberia, North America and other cratons (e.g., Maruyama, 1994;Dobretsov et al, 2003;Ernst et al, 2008). Those dikes are of similar ages (e.g., Buchan and Ernst, 2004;Ciborowski et al, 2014;Ernst, 2014;Yarmolyuk et al, 2014) and the major new continents formed after the Rodinia breakup, e.g., North and South Americas, Africa, Antarctica, were large (e.g., Maruyama, 1994;Dobretsov et al, 2003;Li et al, 2008;Bogdanova et al, 2009). …”