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Material that melted to form the early continents was what?
The material that melted to form the early continents was primarily basaltic oceanic crust. This crust was melted by the heat generated in the Earth's interior, resulting in the formation of granitic continental crust through processes like partial melting and differentiation.
Can Small amounts of water can lower partial melting temperatures in silicate rocks?
Yes, small amounts of water can lower the partial melting temperatures of silicate rocks by promoting the breakdown of mineral structures, reducing viscosity, and increasing mobility of magma. Water can act as a flux, helping to facilitate melting at lower temperatures.
Are basaltic igneous rocks high in iron and magnesium?
Yes, basaltic igneous rocks are typically high in iron and magnesium. This is because basalt forms from the partial melting of the Earth's mantle, which is rich in these elements. The high iron and magnesium content gives basalt its dark color and dense, fine-grained texture.
Can Small amounts of water lower partial melting temperatures in silicate rocks?
Yes, small amounts of water can lower the partial melting temperatures of silicate rocks by promoting the breaking of chemical bonds and reducing the viscosity of the rock. This can lead to increased melting and magma formation at lower temperatures compared to dry conditions.
Basalt is the most common magma erupted along oceanic rift systems?
Basalt is commonly erupted along oceanic rift systems due to its low viscosity and high fluidity, making it easier for the magma to flow and reach the surface. Its composition is also a result of partial melting of the Earth's mantle at mid-ocean ridges, where new oceanic crust is formed through volcanic activity. The eruption of basaltic magma at oceanic rift systems contributes to the continuous creation of new crust and plays a key role in plate tectonics.
What is the parent rock of migmatite?
The parent rock of migmatite is typically a metamorphic rock like gneiss or schist that has undergone partial melting due to high temperatures and pressures. This partial melting results in the formation of a mixed rock composed of both igneous and metamorphic features.
What rocks would exhibit evidence of partial melting?
Rocks such as migmatites, which are a mixture of igneous and metamorphic rock formed through partial melting, would exhibit evidence of this process. Additionally, some granites and gneisses can show signs of partial melting due to the presence of melt pockets or segregated mineral assemblages.
Material that melted to form the early continents was what?
The material that melted to form the early continents was primarily basaltic oceanic crust. This crust was melted by the heat generated in the Earth's interior, resulting in the formation of granitic continental crust through processes like partial melting and differentiation.
Can Small amounts of water can lower partial melting temperatures in silicate rocks?
Yes, small amounts of water can lower the partial melting temperatures of silicate rocks by promoting the breakdown of mineral structures, reducing viscosity, and increasing mobility of magma. Water can act as a flux, helping to facilitate melting at lower temperatures.
Would pressure play a role in partial melting?
In so far as pressure affects the melting point of substances, the answer is yes.
What is thought to form by partial melting and in situ crystallization of the melted portion?
migmatite
Which process is the key concept behind smelting metals from ores?
Partial melting
What plate boundary does felsic rock come from?
Felsic rocks, such as granite, primarily originate from convergent plate boundaries where continental crust collides and undergoes partial melting to form silica-rich magmas. These magmas then cool and solidify to create felsic rocks.
Why are volcanic chains associated with convergent boundaries?
partial melting occurs due to subduction.
What is responsible for the partial melting of peridotite beneth the mid-ocean ridges?
An increase in pressure.
What are melting regions in the mantle called?
Melting regions in the mantle are called melting anomalies or melting zones. These are areas where the temperature and pressure conditions are conducive for the partial melting of mantle rocks, leading to the formation of magma that can eventually erupt at the surface as lava.
Are basaltic igneous rocks high in iron and magnesium?
Yes, basaltic igneous rocks are typically high in iron and magnesium. This is because basalt forms from the partial melting of the Earth's mantle, which is rich in these elements. The high iron and magnesium content gives basalt its dark color and dense, fine-grained texture.
