Centimeter-scale magmatic enclaves are abundant in peralkaline felsic volcanic rocks the Sanshui Basin. Their lithology is mainly syenite and syenitic porphyry, they comprise alkali feldspar amphibole, which similar to mineral assemblage of host trachyte comendite. The SiO2 content ~63 wt%, that but lower than Thermobarometric calculations showed crystallized at temperature pressure conditions ...

The origin and stability of deep-mantle melts, and the magmatic processes at different times of Earth's history are controlled by the physical properties of constituent silicate liquids. Here we report density functional theory-based simulations of model basalt, hydrous model basalt and near-MORB to assess the effects of iron and water on the melt structure and density, respectively. Our result...

Many andesites erupted at arc volcanoes are the products of magma mixing, and this process could be important in triggering their eruption. Throughout life Ngauruhoe volcano (?2.5 ka), lack macroscopic enclaves or lithological features mingled magma. However, intricate microscopic mixing mingling occur. Plagioclase phenocrysts have a wide range textures. Their diverse 87Sr/86Sr values (0.7039–0...

Abstract Petrological and geochemical features of gabbros fine-grained mafic rocks (mafic microgranular enclaves; MMEs) in the Inagawa Granite Ryoke Plutonic Complex were investigated to assess interactions between coexisting silicic magmas, petrogenetic relationships MMEs surrounding gabbros. The exhibit mingling textures that imply coexistence magmas did not undergo complete mixing, but compo...

From algal suspensions to magma upwellings, one finds jets which exhibit complex symmetry-breaking instabilities as they are decelerated by their surroundings. We consider here a model system--a saline jet descending through a salinity gradient--which produces dynamics unlike those of standard momentum jets or plumes. The jet coils like a corkscrew within a conduit of viscously entrained fluid,...

Radiographic imaging of magma dynamics in a volcanic conduit provides detailed information about ascent and descent of magma, the magma flow rate, the conduit diameter and inflation and deflation of magma due to volatile expansion and release. Here we report the first radiographic observation of the ascent and descent of magma along a conduit utilizing atmospheric (cosmic ray) muons (muography)...

In open conduit volcanoes, volatile-rich magma continuously enters into the feeding system nevertheless the eruptive activity occurs intermittently. From a practical perspective, the continuous steady input of magma in the feeding system is not able to produce eruptive events alone, but rather surplus of magma inputs are required to trigger the eruptive activity. The greater the amount of surpl...