Analyses of elemental abundances by secondary ion mass spectrometry (SIMS) require matrix-matched standard samples to account for the matrix effect on correction factors. This requirement makes it difficult obtain accurate results geological variable chemistry. In this study, we prepared 39 volcanic glasses foiditic, basaltic, basaltic andesitic, rhyolitic and pure SiO2 compositions, including ...

Volcanoes exhibit a wide range of eruptive and geochemical behavior, which has significant implications for their associated risk. The suggested first-order drivers intervolcanic diversity invoke combination crustal mantle processes. To better constrain mantle-crustal-volcanic coupling, we used the well-studied Lesser Antilles island arc. Here, show that melt flux from mantle, identified by pro...

Abstract Textures and whole-rock chemistry, as well mineral composition, were analyzed in megaspherulites (high-temperature crystallization domains [HTCDs]) that formed different geographical geotectonic contexts during geological periods (Silver Cliff, CO, USA—Paleogene; El Quevar, Argentina—Miocene; Meissen Volcanic Complex, Germany—Late Carboniferous). All of these have exclusively rhyolitic...

Abstract Changes in climate and fire regime have long been recognized as drivers of the postglacial vegetation history Yellowstone National Park, but effects locally dramatic hydrothermal activity are poorly known. Multi-proxy records from Goose Lake used to describe Lower Geyser Basin where modern is widespread. From 10,300 cal yr BP 3800 BP, thermal waters discharged into lake, evidenced by d...

The Gandy gold-base metal deposit is located in Tertiary Torud-Chahshirin volcano-plutonic range, north of Central Iran. Various styles of gold mineralization occur throughout the range. Mineralization at Gandy occurs in close spatial relation with rhyolitic domes in a caldera setting in a series of narrow brecciated veins. Two mineralogically and spatially different argillic alterations have a...

Abstract Lithium and boron are trace components of magmas, released during exsolution a gas phase volcanic activity. In this study, we determine the diffusivity isotopic fractionation Li B in hydrous silicate melts. Two glasses were synthesized with same rhyolitic composition (4.2 wt% water), having different contents; these studied diffusion-couple experiments that performed using an internall...