Volcanic rocks of the Ediacaran Musgravetown Group on Bonavista Peninsula, Avalon terrane, Newfoundland, include basal ca. 600 Ma calc-alkaline basalt succeeded by continental tholeiite and alkaline rhyolite 592 Plate Cove volcanic belt (Bull Arm Formation), indicating a change from subduction-related to extensionrelated tectonic regimes during that interval. Alkalic basalts northeastern (Dam P...

The North Tabriz Fault is seismologically an active fault with current right lateral strike-slip movements. Restricted mafic to intermediate Late Cretaceous igneous rocks are exposed along the North Tabriz Fault. Whole rock samples and clinopyroxene phenocrysts geochemistry were studied in order to characterize the petrogenesis of these mafic rocks and their possible relation to an oceanic crus...

Wadi Ghadir ophiolite in the Egyptian Eastern Desert, which forms northern part of Nubian Shield, is considered as one best-preserved segments Neoproterozoic oceanic lithosphere on Earth. Primary melt calculations and thermodynamic modeling new geochemical data for pillow lavas dike complexes, integrated with comprehensive petrographic investigations, are here employed to unravel geodynamic evo...

Cretaceous mafic dykes in the Moyar Shear Zone (MSZ) area, north Kerala, India, provide signatures to probe into the nature of their source and thereby the evolution of the Mesozoic lithospheric mantle beneath the South Indian Granulite Terrain (SIGT). Bulk of the dykes in northern parts of Kerala is broadly in spatial association with the shear system. Mafic dykes striking NE-SW, NWSE, NNW-SSE...

Abstract We present a detailed petrologic study of rhyolites from seven eruptions spanning the full (?190 ky) history rhyolitic volcanism at Krafla volcano, northeast Iceland. The vary widely in size and style, but all are crystal-poor (<6 modal%: plagioclase + augite ± pigeonite orthopyroxene titanomagnetite fayalite) have similar evolved compositions (73.7–75.8 wt% normalized whole-roc...

Stable Ca isotopes are an increasingly useful tool for understanding the sources and processes leading to formation of magmatic rocks, yet isotope fractionation during genesis silicic continental crust is still poorly understood. Here, we present Ca, Sr, Nd isotope, as well major- trace-element whole-rock geochemical data A-, I-, S-type granites (n = 30) from Australia/Tasmania, Canada, France ...