Abstract. Clinopyroxene-only thermobarometry is one of the most practical tools to reconstruct crystallization pressures and temperatures clinopyroxenes. Because it does not require any information coexisting silicate melt or other co-crystallized mineral phases, has been widely used elucidate physiochemical conditions crystallizing magmas. However, previously calibrated clinopyroxene-only ther...

the noorabad-kermanshah ophiolite is part of eastern mediterranean-zagros-oman tethyan ophiolites, that this area is located in south-southwest of the main zagros thrust fault. this ophiolite consists of peridotites, serpentinites and pegmatite gabbros as mantle sequence whereas crustal sequences are composed of locally layered gabbros, isotropic gabbros, sheeted dike complex, basaltic to andes...

The objectives of this work were to study rates of increase in allophane concentration, specific surface area changes, and organic matter accretion in a young andesitic chronosequence. We sampled the 0–10-, 10–20-, 30–40-, 70–80-, and 140–150-cm depths of 77-, 255-, 616-, and approximately 1200+-year-old soils and analyzed them for allophane, ferrihydrite, specific surface area, cation exchange...

The Aurora volcanic field, located along the northeastern margin of Mono Lake in the Western Great Basin, has erupted a diverse suite of high-K and shoshonitic lava types, with 48 to 76 wt% SiO2, over the last 3.6 million years. There is no correlation between the age and composition of the lavas. Three-quarters of the volcanic field consists of evolved (,4 wt% MgO) basaltic andesite and andesi...

the study area is located in southeastern iran, about 110 km southwest of kerman. geologically, the area is composed of ophiolitic rocks, volcanic rocks, intrusive bodies and sedimentary rocks. vein mineralization within andesite, andesitic basalt, andesitic tuffs occurred along the chahar gonbad fault. sulfide mineralization in the ore deposit has taken place as dissemination, veins and veinle...

This work presents a considerable volume of new and compiled data indicating that arc magmatism in the western paleomargin Gondwana began Carboniferous continued during Permian Early Triassic. Subsequently, reactivated Middle Jurassic due to subduction Farallon Plate under continental paleomargin. The pluton belts are distributed from edge toward interior continent same orientation as slab (wes...

the cheshmeh hafez polymetal deposit is located in troud – chahshirin mountain range in southeastern damghan. in this province, the volcanism and associated mineralization are closely related to major faults anjilo and troud with nw-se trend. the exposed rocks in the study area consist of volcano clastic sequence of sandstone, tuff, volcano breccias and mostly andesitic and andesitic- basalt fl...

In order to explore the materials’ complexity induced by bubbles rising through mixing magmas, bubbleadvection experiments have been performed, employing natural silicate melts at magmatic temperatures. A cylinder of basaltic glass was placed below a cylinder of rhyolitic glass. Upon melting, bubbles formed from interstitial air. During the course of the experimental runs, those bubbles rose vi...

Fifteen andesite-dacite stratovolcanoes on the volcanic front of a single segment of the Andean arc show along-arc changes in isotopic and elemental ratios that demonstrate large crustal contributions to magma genesis. All 15 centers lie 90 km above the Benioff zone and 280 _+ 20 km from the trench axis. Rate and geometry of subduction and composition and age of subducted sediments and seafloor...