Which volcanoes are mafic?
Kilauea on the Big Island, for example, has erupted mafic lava almost continuously since 1983. Because the viscosity is low, mafic magma tends to produce volcanic cones with gentle slopes, called shield volcanoes. These enormous structures form the largest (in volume and mass) mountains on Earth.
Is Mt St Helens mafic?
Systematic variations in the composition of volcanism over the past several thousand years at Mt. St. Helens imply that the magma chamber is zoned, from more felsic at the top to more mafic at the bottom.
Is Mount St. Helens mafic or felsic?
Magma mixing has also controlled the composition of andesites erupted at Mount St. Helens, and thus it appears that the continuum of magmatic composition erupted at the volcano is controlled by mixing between felsic dacite, or possibly rhyodacite, and basalt.
Is Mauna Loa felsic or mafic?
Mauna Loa, Shield Mauna Loa is a shield volcano which has the chracteristics of a shield volcano. A shield volcano covers a wide area, is broad at its base and forms quiet eruptions. The mafic lava flows out around the vent, harden, and build up a cone.
Are stratovolcanoes mafic or felsic?
The lava flowing from stratovolcanoes typically cools and hardens before spreading far, due to high viscosity. The magma forming this lava is often felsic, having high-to-intermediate levels of silica (as in rhyolite, dacite, or andesite), with lesser amounts of less-viscous mafic magma.
Is Krakatoa mafic?
What makes some volcanoes extremely explosive, such as the eruptions of Krakatau and Mt. Vesuvius, is the mixing of felsic and mafic magma in the chamber. Anak Krakatau is a newly formed volcano that resulted from the eruption in 1883.
Is Krakatoa mafic or felsic?
What makes some volcanoes extremely explosive, such as the eruptions of Krakatau and Mt. Vesuvius, is the mixing of felsic and mafic magma in the chamber. As mafic magma is being mixed into more felsic magma, vesculiation occurs due to the convection of mixing.
Is Mt Fuji felsic?
Basaltic rocks dominate in Mt. Fuji, while other arc volcanoes are dominated by intermediate and felsic compositions, and Mt. Fuji has been studied intensively using geological and geophysical methods to understand the evolution, magma plumbing system, and current activity of the volcano.
Is andesite mafic?
Andesite is INTERMEDIATE in composition between MAFIC and FELSIC rocks. The mixture of mafic and felsic minerals gives the rock a “salt and pepper” appearance. DIORITE – phaneritic rock (large crystals) of both mafic and felsic minerals. ANDESITE – aphanitic rock (small crystals) of both mafic and felsic minerals.
Can a volcano both be mafic and felsic?
Felsic rocks and mafic rocks will separate out and the mafic material settles to the bottom. -Can form shield volcanoes >Hawaii-Basalts >Yellowstone-both rhyolite
What are the five major types of volcanoes?
Cinder Cone Volcano. Cinder Cone is the simplest,most common type,and has a characteristic cone shape.
What is the most recent volcano?
Mauna Loa and Kilauea,Hawaii Volcanoes National Park,Hawaii.
Is felsic lava hotter than mafic lava?
Whereas temperatures in common silicate lavas range from about 800 °C (1,470 °F) for felsic lavas to 1,200 °C (2,190 °F) for mafic lavas, the viscosity of the same lavas ranges over seven orders of magnitude, from 10 4 cP for mafic lava to 10 11 cP for felsic magmas.