Abstract The alkaline Cho Don complex in NE Vietnam comprises several mafic-felsic suites related to the widespread magmatism developed during early-Permian–late-Triassic. contribution explores petrogenesis of nepheline syenite from Bang Phuc massif and its petrogenetic relationship with cogenetic scapolite-rich gabbro. formed through fractional crystallization pristine mantle-derived basaltic ...

Eclogites, metagabbros, and paragneisses from the Variscan Münchberg Massif record a complex succession of igneous, hydrothermal metamorphic processes. The geodynamic setting related to protolith formation impact different types fluid-rock interactions have been uncertain up now. We use major trace element chemistry as well oxygen isotopes disentangle geochemical signatures stages rocks' histor...

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...

Abstract The Tarim craton in modern Central Asia was an important component of the supercontinent Rodinia Neoproterozoic, although its paleogeography during that era is still controversial. Here, we present new stratigraphic, geochemical, and geochronological data from Neoproterozoic sedimentary volcanic rock successions along northwestern margin discuss significance these our interpretations f...

Ca isotope geochemistry has great potential for improving our understanding of magmatic systems and tracing the deep Earth carbon cycle. There are still many open questions, however, regarding proper application this relatively novel proxy to study mantle-derived magmas, including (i) possible effects pressure on mineral-melt fractionation factors, (ii) isotopes be used as tracers recycled mari...

Deviating from standard possible-worlds semantics, authors belonging to what might be called the ‘imperative tradition’ of deontic logic have proposed a semantics that directly represents norms (or imperatives). The paper examines possible definitions of (monadic) deontic operators in such a semantics and some properties of the resulting logical systems. 1. Imperative Semantics and Basic Operat...

Abstract Basalts and basaltic rocks are the most abundant igneous on earth their petrologic geochemical studies have formed our knowledge base thermal structure composition of mantle with which we developed workable models chemical differentiation earth. All this would not been possible without innovative painstaking experimental petrology peridotite melting, magma generation evolution largely ...

the lut block in eastern iran is a micro-continental block within the convergent orogen between the arabian, eurasian and indian plates. large areas of the north-central, eastern, and western lut block are covered by volcanic rocks of paleogene, neogene and quaternary age.  peak volcanic activity took place in the north-central part of the lut block during the eocene, and then dramatically decr...