Type 19 28 19.70 N 155 35 31.94 W in the search bar on...

Type 19 28 19.70 N 155 35 31.94 W in the search bar on Google Earth, and zoom out to an eye altitude of ~119 miles. This volcano is composed of: a. mafic rocks, because a hotspot partially melted the mantle below the oceanic crust b. mafic rocks, because a hotspot partially melted the oceanic crust c. ultramafic rocks, because a hotspot partially melted the mantle below the oceanic crust d. ultramafic rocks, because a hotspot partially melted the oceanic crust

Type 19 28 19.70 N 155 35 31.94 W in the search bar on Google Earth, and zoom out to an eye altitude of ~119 miles. This volcano is composed of:
a. mafic rocks, because a hotspot partially melted the mantle below the oceanic crust
b. mafic rocks, because a hotspot partially melted the oceanic crust
c. ultramafic rocks, because a hotspot partially melted the mantle below the oceanic crust
d. ultramafic rocks, because a hotspot partially melted the oceanic crust

Key Concepts

Mafic Rocks

Mafic rocks are igneous rocks characterized by their dark color and high content of magnesium and iron. They typically have a relatively low silica content and are the product of partial melting in the mantle, which yields basaltic magma. Since these rocks are dense and low in viscosity, they play a key role in the formation of volcanoes associated with oceanic hotspots.

Hotspot Volcanism

Hotspot volcanism refers to volcanic activity that occurs due to the presence of a fixed region of anomalously high heat in the mantle, known as a hotspot. As a tectonic plate moves over this stationary hotspot, the partial melting of the underlying mantle material generates basaltic magma that rises to form a chain of volcanoes. This mechanism explains the formation of many intraplate volcanoes, such as those found in oceanic settings.

Partial Melting

Partial melting is the process in which only a portion of a solid is melted, resulting in a magma with a composition different from that of the original source rock. In the context of hotspot volcanism, partial melting of the mantle produces mafic magmas that are low in silica and enriched in iron and magnesium. This process is fundamental to understanding the formation of basaltic, mafic rocks in volcanic settings.

Mantle Source of Magma

The mantle is the primary source of magma for many volcanoes, especially those formed at hotspots. Unlike the oceanic crust, which is not easily melted under typical conditions, the mantle can partially melt when subjected to increased temperatures by a hotspot. This leads to the generation of basaltic magma, which is responsible for producing the predominantly mafic composition observed in many volcanic eruptions associated with hotspots.

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