Explosive eruptions involve mainly silicic magmas in which sulfur solubility and diffusivity are low. This inhibits sulfur exsolution during magma uprise as compared to more mafic magmas such as basalts. Silicic magmas can nevertheless liberate large quantities of sulfur as shown by the monitoring of SO2 in recent explosive silicic eruptions in arc settings, which invariably have displayed an e...

The Tuscany Magmatic Province consists of a Miocene to Pleistocene association wide variety rock types, including peraluminous crustal anatectic granites and rhyolites, calcalkaline shoshonitic suites ultrapotassic lamproites. In addition the magma types already recognised, occurrence new, distinct type at Capraia Elba islands in mafic enclaves San Vincenzo rhyolites has been suggested by recen...

Abstract In the Gasht-Masuleh area in Alborz Mountains, gabbroic magma intruded Palaeozoic metasediments and Mesozoic sediments crystallised as isotropic cumulate gabbros. LREE enrichment points to relatively low degrees of mantle melting depletion Ti, Nb Ta relative primitive an arc related component magma. Clinopyroxene compositions indicate MORB signatures. U–Pb zircon crystallisation ages 9...

Abstract Mafic volcanic activity is dominated by effusive to mildly explosive eruptions. Plinian and ignimbrite-forming mafic eruptions, while rare, are also possible; however, the conditions that promote such explosivity still being explored. Eruption style determined ability of gas escape as magma ascends, which tends be easier in low-viscosity, magmas. If permeability sufficiently high reduc...

The island of Syros consists largely of possibly-repeated sequences of glaucophane-bearing calcareous schists, mafic schists, dolomite marbles, and calcite marbles containing abundant aragonite pseudomorphs (Dixon, 1969; Hecht, 1984). Several discrete, fault-bounded packages of blueschist/eclogite-facies mafic rocks with minor serpentinite are also found on the island. Although the mafic rocks ...

Abstract Granitoids are the main constituents of continental crust, and an understanding their petrogenesis is key to origin evolution continents. Whether crystal fractionation dominant way generate evolved magmas has long been debated, mostly because such processes would produce large volumes complementary cumulates, which remains elusive. Mafic magmatic enclaves (MMEs) ubiquitous in granitoid...

Abstract We present major and trace element data on clinopyroxene‐hosted, glassy melt inclusions (MIs) from a highly enriched (high 87 Sr/ 86 Sr = 0.71856) lava (ALIA‐D115‐18) the Samoan hot spot. Following correction for post‐entrapment crystallization, MIs are trachytic (62.6–65.4 wt% SiO 2 , 1.5–3.0 MgO, 7.2–10.6 total alkalis (Na O + K O)) ALIA‐D115 lavas dredged off submarine flanks of Sav...

We present in situ major element, trace and Sr–Nd isotope data of apatite from an alkaline–carbonatite intrusion the South Qinling Belt (SQB) to investigate their magma evolution mantle sources. The Shaxiongdong (SXD) complex consists predominantly early Paleozoic hornblendite, nepheline syenite, subordinate Triassic carbonatite. Apatites all lithologies are euhedral subhedral belong fluorapati...