Establishing the composition–structure–property relationships for amorphous materials is critical many important natural and engineering processes, including dissolution of highly complex volcanic glasses. In this investigation, we performed force field molecular dynamics (MD) simulations to generate detailed structural representations 10 CaO–MgO–Al2O3–SiO2–TiO2–FeO–Fe2O3–Na2O–K2O glasses with ...

The massive sulfide deposits (VMS) from Mănăilă are associated with the metamorphic formations of Tulgheș Lithogroup Bucovinian Nappes Crystalline-Mesozoic Zone in Eastern Carpathians, Romania. following types ore were identified: pyrite-polymetallic, pyrite copper, compact and precompact quartz-precompact copper. polymetallic mineralization consists pyrite, chalcopyrite, sphalerite, galena, su...

The Yellowstone Plateau volcanic field is one of the largest centers exchange time to form zoned zircons is between a few hundred and a few thousand years, which reflects the residence time of lowO of rhyolitic magmatism on Earth. Major caldera-forming eruptions are followed by unusual lowO rhyolites. New oxygen isotope, magmas after formation and before eruption. petrologic and geochemical dat...

Spherulite crystallization induces Fe-redox redistribution in silicic melt 1 2 Jonathan M. Castro 1* , Elizabeth Cottrell 1 , Hugh Tuffen 2 , Amelia Logan 1 , and Katherine 3 A. Kelley 3 4 5 1 Department of Mineral Sciences, Smithsonian Institution, 10 th and Constitution Ave. 6 NW, Washington, DC 20560 7 8 2 Department of Environmental Science, Lancaster University, LA1 4YQ, UK 9 10 3 Graduate...

Unintentional encounters with silicic magma at ~2–2.5 km depth have recently occurred during drilling three volcanoes: Kilauea (Hawaii), Menengai (Kenya), and Krafla (Iceland). Geophysical surveys had failed to warn about shallow before each encounter, subsequent been unable resolve the size or architecture of its body. This presents a conundrum for volcano monitoring: Do such “covert” bodies p...

Tarawera volcano (New Zealand) is volumetrically dominated by rhyolitic lavas and pyroclastic deposits, but the most recent event in AD 1886 was a basaltic Plinian fissure eruption. In March 2019 swarm of at least 64 earthquakes occurred to NE volcano, as recorded New Zealand Geohazard Monitoring Network (GeoNet). We use seismological analysis show that this likely caused dyke intruded into bri...

Abstract Magnetite is a common mineral in the Paleoproterozoic Stollberg Zn–Pb–Ag plus magnetite ore field (~6.6 Mt of production), which occurs 1.9 Ga metamorphosed felsic and mafic rocks. Mineralisation at consists bodies massive to semi-massive sphalerite–galena pyrrhotite (with subordinate pyrite, chalcopyrite, arsenopyrite magnetite) hosted by metavolcanic rocks skarn. sulfides, skarn, amp...