High-temperature crystallization domains (HTCDs) including spherulites and lithophysae
form during cooling of silica-rich lava and welded ignimbrites. Spherulites grow in silicate …

Lava flows occur worldwide, and throughout history, various cultures (and geologists) have
described flows based on their surface textures. As a result, surface morphology-based …

Volume 30 of Reviews in Mineralogy introduces in understanding the behavior of magmatic
volatiles and their influence on a wide variety of geological phenomena; in doing this it also …

We propose a mechanism by which massive ignimbrite and layered ignimbrite sequences—
the latter liable to have been previously interpreted as multiple flow units-form by …

The volcanic rocks of the Lower Cretaceous Paraná-Etendeka Igneous Province, in Brazil,
are grouped in the Serra Geral Group. The province can be chemically divided into low-TiO …

The growth of lava domes can be either quiescent or violent, with transitions between styles
of behavior commonly occurring with little warning. Here we propose that the behavior …

The permeability of crystal-poor obsidian flow and pumice samples from Medicine Lake
Volcano, USA, are measured to assess (1) the existence of a critical vesicularity (porosity) …

The emplacement mechanisms of rhyolitic lava flows are enigmatic and, despite high lava
viscosities and low inferred effusion rates, can result in remarkably, laterally extensive (> 30 …

Volcanic-associated massive sulfide deposits (VMS deposits) have been studied in more
detail than their volcanic host rocks. Over the last 10 years, however, there has been a …

High-temperature silicic volcanic rocks, including strongly rheomorphic tuffs and extensive
silicic lavas, have recently been recognized to be abundant in the geologic record. However …