The 2021 eruption of La Palma (September 19-December 13) was the first subaerial in Canary Islands 50 years. Approximately 0.2 km3 lava erupted from a newly formed, broadly basaltic composite volcanic edifice on northwestern flank Cumbre Vieja ridge. Comprehensive sampling olivine- and clinopyroxene-phyric lavas over period reveals temporal changes mineralogy bulk rock geochemistry tephrite to ...

The oldest-known rocks of the eroded Dunedin Volcano (DV), New Zealand, active 16.0–11.0 Ma, were emplaced by penecontemporaneous explosive eruptions and intrusions magmas with a remarkable range compositions, including basanite, alkali basalt, trachyte phonolite. compositional diversity in rapid succession during earliest development volcano signify existence complex magmatic system highly evo...

A tephrostratigraphy of the active Antarctic volcano, Mt. Erebus, was determined from englacial tephra on the ice-covered flanks of Erebus and an adjacent volcano. The tephra are, used to reconstruct the eruptive history and magmatic evolution of Erebus. Scanning electron microscope images and Image Particle Analysis suggest the tephra formed in phreatomagmatic and magmatic eruptions and in som...

The Zhob ophiolite is divided into Ali Khanzai, Omzha, and Naweoba blocks. geology comprises various lithological units including basalt–chert hyaloclastite mudstone units. consist of thick lava pelagic sediments. On the basis petrology geochemistry, lavas unit can be tholeiitic basalt, trachybasalt, basaltic andesite dacite, that more alkaline foidite, picrobasalt, tephrite-basanite. rocks hav...

Abstract Alkaline magmatic systems formed in intraplate settings have a low Au endowment, contrasting with the high fertility of alkaline arc and rift settings, which host numerous Au-rich porphyries Cu-Au Au-Ag epithermal deposits. Among other factors, system is determined by concentration ore-forming magma, strongly controlled amount chemistry sulfides that fractionated during magma different...

At the southernmost part of Tierra del Fuego a few outcrops and erratic boulders of alkali basaltic rocks with ultramafic enclaves have been studied. Alkali basalt plugs or pipes hitherto identified are scarce, and host rocks are constituted by slates that belong to Mesozoic deposition. The petrography, texture and composition of the basalt and xenoliths were investigated by petrographic micros...

We present new viscosity measurements for melts spanning a wide range of anhydrous compositions including: rhyolite, trachyte, moldavite, andesite, latite, pantellerite, basalt and basanite. Micropenetration and concentric cylinder viscometry measurements cover a viscosity range of 10 to 10 Pas and a temperature range from 700 to 1650 °C. These new measurements, combined with other published da...