The Yellowstone supervolcano is one of the largest active continental silicic volcanic fields in the world. An understanding of its properties is key to enhancing our knowledge of volcanic mechanisms and corresponding risk. Using a joint local and teleseismic earthquake P-wave seismic inversion, we revealed a basaltic lower-crustal magma body that provides a magmatic link between the Yellowston...

Spherulites are spherical clusters of radiating crystals that occur naturally in rhyolitic obsidian. The growth of spherulites requires diffusion and uptake of crystal forming components from the host rhyolite melt or glass, and rejection of non-crystal forming components from the crystallizing region. Water concentration profiles measured by synchrotron-source Fourier transform spectroscopy re...

Abstract Geochemical and mineralogical investigations of the Lower Permian Kemmlitz rhyolite within NW-Saxonian Basin (Germany) associated lithophysae (high-temperature crystallization domains) as well agates were carried out to constrain genesis characteristics these volcanic rocks origin agate-bearing lithophysae. The rhyolitic composition are dominated by quartz, sanidine, orthoclase most li...

Data from the U.S. Geological Survey’s National Water Information System (NWIS) database reveal the existence of a number of thermally anomalous areas on the eastern Snake River Plain (ESRP) aquifer, most of them near its margins, and NWIS temperature and chemistry data provided conclusive evidence that thermal waters originating in the hot rhyolitic rocks underlying the ESRP basalts inject hea...

INTRODUCTION Approximately 160,000 yr ago, one of the largest Quaternary explosive volcanic eruptions of the Mediterranean basin occurred just offshore of the island of Kos (Greece), resulting in ~60 km of volcanic ash and pumice emplaced as pyroclastic fall and fl ow deposits over an area >2000 km (Keller, 1969; Allen, 2001; Fig. 1). In comparison to the 3500 yr B.P. Minoan eruption, which cre...

The Mondaca Volcano comprises a thick rhyolitic lava-field and dome of similar composition, located near the Lontué River Valley headwaters in northern part Southern Andes Volcanic Zone. It reaches total volume ~0.85 km3, it is formed by 4 subunits, named 1, 2, 3 4, which correspond to successive blocky lava flows, emitted from rounded structure. They present well-preserved flow structures and,...