Abstract We present microbeam major- and trace-element data from 14 monzodiorites collected the Malaspina Pluton (Fiordland, New Zealand) with goal of evaluating processes involved in production andesites lower arc crust. focus on relict igneous assemblages consisting plagioclase amphibole lesser amounts clinopyroxene, orthopyroxene, biotite quartz. These are heterogeneously preserved crust wit...

Abstract Two suites of amphibole-rich mafic–ultramafic rocks associated with the voluminous intermediate to felsic in Early Cretaceous Laiyuan intrusive–volcanic complex (North China Craton) are studied here by detailed petrography, mineral and melt inclusion chemistry, thermobarometry demonstrate an situ reaction-replacement origin hornblendites. Moreover, a large set compiled newly obtained g...

Abstract We present a detailed petrologic study of rhyolites from seven eruptions spanning the full (?190 ky) history rhyolitic volcanism at Krafla volcano, northeast Iceland. The vary widely in size and style, but all are crystal-poor (<6 modal%: plagioclase + augite ± pigeonite orthopyroxene titanomagnetite fayalite) have similar evolved compositions (73.7–75.8 wt% normalized whole-roc...

Abstract The ~5 km3, 4.54–4.09 Ma Caspana ignimbrite of the Altiplano-Puna volcanic complex (APVC) Central Andes records eruption an andesite and two distinct rhyolitic magmas. It provides a unique opportunity to investigate production silicic magmas in continental arc flare-up, where small volumes magma rarely survive homogenization into regional magmatic system that is dominated by supererupt...

The investigation of heterogeneous magma systems enhances the understanding differentiation and transfer processes in active volcanoes, thus constraining dynamics driving eruptions related hazard. Magma heterogeneity is generally preserved coeval juvenile products explosive eruptions, as it occurs Upper Pumice sequence, emplaced by last sub-Plinian eruption at Nisyros volcano (Greece). deposit ...

Shallow (<1500 mbsl) submarine arc-related hydrothermal systems can host base (Cu), precious (Au) and volatile elements (As, Se, Sb, Te, Tl) in significant quantities. Their wide application the high-tech industry, but a potential eco-toxicological footprint gives them strategic importance. However, processes that concentrate these systems, compared to their mid-ocean ridge counterparts are sti...

Introduction: Although mafic components of dominantly intermediate to silicic ignimbrites are rather common, voluminous, dominantly mafic ignimbrites are rare (e.g., Smith, 1979; cf. Freundt and Schmincke, 1995). Volcán Villarrica, the most active composite volcano in South America, located in the Southern Andean Volcanic Zone (SAVZ, López-Escobar and Moreno, 1994a), has produced two such ignim...

[1] The Hawaii Scientific Drilling Project recovered 3 km of basalt by coring into the flank of Mauna Kea volcano at Hilo, Hawaii. Rocks recovered from deeper than 1 km were deposited below sea level and contain considerable fresh glass. We report electron microprobe analyses of 531 glasses from the submarine section of the core, providing a high-resolution record of petrogenesis over ca. 200 K...

Abstract. Volcanoes represent one of the most critical geological settings for hazard modelling due to their propensity both unpredictably erupt and collapse, even in times quiescence. are heterogeneous at multiple scales, from porosity, which is variably distributed frequently anisotropic, strata, laterally discontinuous commonly pierced by fractures faults. Due variable and, times, intense st...

introduction: occurrence of landslides depends on several factors such as the composition and structure of earth materials, rainfall level, temperature, groundwater regime and cover crops. landslides are a main natural hazard in iran, because of its special geological conditions and its mountainous active tectonic regime. linear civil structures, such as roads, highways and railways, face serio...