Glassy ejecta are associated to a limited number of impact craters, and yet hold key information about hypervelocity processes. Here we report on the discovery ∼650 km2 glass strewnfield in Central Depression Atacama Desert. These cm-sized splash-form objects, that refer as atacamaites, essentially composed dacitic formed by high-temperature melting local magmatic rocks, with addition variable ...

Introduction: Volcanism is the primary process in the solar system that creates the surfaces of the terrestrial planetary bodies. Volcanoes and volcanic surface units provide information about the geologic history of these bodies, which reflects the unique thermal and chemical evolution of each. Remote sensing provides an effective means to study these volcanic surface units in a quantitative w...

Cordón Caulle in southern Chile has produced three dacitic to rhyolitic fissure eruptions over the past century (in 1921–1922, 1960 and 2011–2012), thereby provides an ideal opportunity examine architecture of its underlying silicic system. While 2011–2012 eruption been extensively studied, comparatively little is known about 1921–1922 events. Major-element matrix glass analyses from products (...

Accurate models of H2O and CO2 solubility in silicate melts are vital for understanding volcanic plumbing systems. These used to estimate the depths magma storage regions from melt inclusion volatile contents, investigate role exsolution as a driver eruptions, track degassing path followed by ascending surface. However, despite large increase number experimental constraints over last two decade...

Sixteen rhyolitic and dacitic Cretaceous Paleocene-Eocene lavas from the Lesser Caucasus have been subjected to paleomagnetic multimethod paleointensity experiments analyze variations of Earth's magnetic field. Paleointensity were performed with two methods. Thellier-type IZZI method on 65 specimens (nine flows) yielded 15 successful determinations multispecimen 14 samples (seven determinations...

Future occurrence of explosive eruptive activity at Cotopaxi and Guagua Pichincha volcanoes, Ecuador, is assessed probabilistically, utilizing expert elicitation. Eight eruption types were considered for each volcano. Type event probabilities evaluated the next volcano least one type within 100 years. For type, we elicited relevant source parameters (duration, average plume height, total tephra...

The Tapias lava dome is located ~5 km SE of the explosive, Cerro Machín polygenetic volcano, both on Colombian Central Cordillera. edifices have been interpreted as generated by same magmatic system; however, genetic and temporal relations between not established. In this work, studied using petrographic characterizations, mineral-, whole-rock- isotopic chemistry, geothermobarometric calculatio...

There is now su ̄ cient information to attempt an integrated model for melt generation, transfer and storage beneath subduction-zone volcanoes. Fluid release from the subducting oceanic crust into the mantle wedge may occur over a period ranging from a few hundred kyr, to as little as less than 1 kyr, before eruption. This supports models in which ®uid addition is closely linked to partial melti...

We present an experimental and petrological study aimed at estimating the pre-eruptive conditions of a Holocene dacitic lava from Volcán San Pedro (36 S, Chilean Andes). Phase-equilibrium experiments were performed at temperatures (T) from 800 to 950 C, and mainly at 200MPa, but also at 55, 150, and 406MPa. Oxygen fugacity ( fO2) ranged from the Ni---NiO buffer (NNO) to 3 5 log units above (NNO...