Pichagchi pluton is situated in the northeastern part of the Soursat complex in Sanandaj-Sirjan metamorphic belt of Iran. The pluton with the age of 74.20 Ma is composed mainly granodiorite, diorite, and tonalite in which mafic minerals are biotite and amphibole. In this study, composition of minerals used to describe the nature of the granitic magma and estimate the pressure and temperature at...

Crystal size distributions (CSDs) of quartz and zircon phenocrysts in individual pumice clasts from several voluminous ash-flow tuffs provide a quenched snapshot view of conditions in preclimactic magma chambers. A common feature of these CSDs is a concavedown, lognormal shape, in contrast to the reported linear CSDs in more mafic systems. This feature is interpreted to be a general result of s...

Oxygen isotope data are reported for clinopyroxene phenocrysts from volcanic rock samples from Filicudi island, Italy, with the aim of investigating mechanisms of magma evolution and mantle source characteristics in a continental arc volcano. Filicudi rocks range from calc-alkaline basalt to high-K andesite and dacite. Mafic rocks have MgO 6-7 wt%, Mg# 60, Ni < 50 ppm and Cr < 200 ppm, suggesti...

Abstract The benign fuming activity of dormant volcanoes is punctuated by phases escalating degassing that, on some occasions, ultimately prelude to eruption. However, understanding the drivers such unrest complicated complex interplay between magmatic and hydrothermal processes. Some most comprehensively characterised have recently been observed at La Fossa cone Vulcano Island, but whether or ...

Abstract Bubble and crystal textures evolve during magma ascent, altering properties that control ascent such as permeability viscosity. Eruption style results from feedbacks between bubble nucleation growth, microlite crystallization, gas loss, all processes recorded in pyroclasts. We show pyroclasts of the mafic Curacautín ignimbrite Llaima volcano, Chile, record a history repeated autobrecci...