The Paleocene-Eocene Cerro Munro pluton, to the east of North Patagonian Batholith (NPB), is a tonalitic intrusion emplaced as shallow, small, sub-circular tonalite-granodiorite body hosting abundant co-magmatic mafic microgranular enclaves (MME). Besides, intrusive crosscut by radial porphyritic dikes and has been related andesitic, dacitic rhyolitic dikes, lava flows ignimbrites cropping out ...

A new influx of sea-rafted pumice reached the eastern coast of Australia in October 2002, approximately 1 year after a felsic, shallow-marine explosive eruption at a previously unknown volcano (0403-091) along the Tofua volcanic arc (Tonga). The eruption produced floating pumice rafts that first became stranded in Fiji in November 2001, approximately 1 month after the eruption. Strandings of se...

Abstract. The permeability of magma in volcanic conduits controls the fluid flow and pore pressure development that regulates gas emissions style eruptions. architecture permeable porous structure is subject to changes as deforms outgasses during ascent. Here, we present a high-resolution study distribution across two conduit shear zones (marginal central) developed dacitic spine extruded towar...

Volcanic cones are frequently near their gravitational stability limit, which can lead to lateral collapse of the edifice, causing extensive environmental impact, property damage, and loss life. Here, we examine collapses in mafic arc volcanoes, relatively structurally simple edifices dominated by a narrow compositional range from basalts basaltic andesites. This still encompasses broad volcano...

Arclogites, or clinopyroxene-, garnet-, amphibole-, and FeTi oxide-bearing cumulates restites (collectively representing residues) to andesitic continental arc magmas, are reviewed here in a companion paper (Ducea et al., 2020). Experimental petrology petrologic observations suggest that these eclogite facies rocks form magmatically deep crustal hot zones beneath arcs with thicknesses exceeding...

Abstract Concentrations of fluorine and chlorine were measured in glasses (quenched melts) coexisting clinopyroxene, orthopyroxene, olivine, plagioclase run products experiments previously used to measure sulfur partitioning between these phases. The F clinopyroxene silicate melt was determined 13 at a variety pressures, temperatures, compositions ranging from basaltic dacitic (49 66 wt% SiO2) ...