Table of Contents
How does h2o affect magma viscosity?
When magmas migrate from their source up towards the Earth surface, water exsolution can result in large (up to several orders of magnitude) increases in magma viscosity because of the strong effect of water on the viscosity of silicate melts (Leonteva 1940; Saucier 1952; Friedman et al.
What effect does water have on the viscosity of magma?
Water decreases the viscosity of magma, which is basically how thick or runny a liquid is.
How does water contribute to magmatism?
Water is a key ingredient in the generation of magmas in subduction zones. These minerals dehydrate, releasing their bound H2O into overlying hotter, shallower mantle where melting begins and continues as buoyant hydrous magmas ascend and encounter increasingly hotter surroundings.
What factors affect the viscosity of magma?
Viscosity of Magmas Viscosity depends on primarily on the composition of the magma, and temperature. Higher SiO2 (silica) content magmas have higher viscosity than lower SiO2 content magmas (viscosity increases with increasing SiO2 concentration in the magma).
Does water make magma more viscous?
Water has low viscosity (flows easily) while syrup and honey have greater viscosity. In contrast, low viscosity magmas flow more rapidly and form lava flows that cover thousands of square kilometers.
What does water and magma make?
This is the realm of “hydrovolcanism” or “phreatovolcanism” — when water and magma interact, either directly or indirectly, to produce volcanic activity. This is called fragmentation, and ash can be produced during these explosions, meaning what could have been a lava flow becomes an explosive eruption.
What effect does water have on the viscosity of magma quizlet?
The magma slows down. WATER CONTENT is inversely related to viscosity. The higher the water content, as a liquid, the lower the viscosity. Water in the mantle causes it to melt faster and creates magma with a higher flow rate.
What three components make up magmas?
Magma and lava contain three components: melt, solids, and volatiles. The melt is made of ions from minerals that have liquefied.
Does water dissolve in magma?
Magmatic water is practically insoluble in silicate melts, but has demonstrated the highest solubility within rhyolitic melts.
What are three things that affect the viscosity of magma?
The three factors that influence the viscosity of a lava are temperature, the dissolved gases it contains, and its chemical composition.
What characteristics of magma determines its explosiveness?
Viscosity, together with the amount of gas dissolved in magma, can determine the explosivity of the eruption. More viscous magma with volatiles is more explosive than less viscous magma, where gases can bubble out relatively easily.
What are the three factors that affect the viscosity of magma?