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No. The Earth's magnetic field consists of invisible lines of force, not rock. The mangetic fiild itself is driven by currents in the outer core, which is made of molten iron and nickel.
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Why are basalts produced on divergent plate boundaries?
As the plates diverge, upper mantle rock rises and undergoes decompression melting along the rift. Because the upper mantle is comprised of mafic rock, the subsequent melt of this rock produces a mafic magma. Basalt and its coarse-grained intrusive twin, gabbro, are produced when this mafic magma solidifies.
Does the mantle have mafic magma or felsic magma in it?
Is has Ultramafic rock in it, whereas core is made from Iron Alloy, Basically from metal
Why is the lava mostly mafic at divergent plate boundaries and intermediate and felsic at convergent plate boundaries?
Mafic magma has extremely high ferromagnesian content, produced by decompression melting. As the plates move apart, mantle rises to fill the void. As it melts, it forms mafic magma. Where plates are meeting, the compression of crust forms magma with higher silica content, thus forming felsic and intermediate magmas.
Why would decompression of mantle peridotite cause the production of mafic magma?
Melting points vary with pressure. In nearly all substances the melting point increases with increasing pressure. The peridotite in the mantle is extremely hot and under immense pressure. When it is decompressed some melting occurs. The composition is not uniform and some minerals have lower melting points than others. The mafic minerals will be able to melt while the ultramafic mineralls generally will not.
How do mafic volcanic rocks get to Earth's surface?
Pressure from overlying crust forces mantle magmas through cracks to Earth's surface. These magmas erupt out of volcanoes, cool, and solidify into rock.
Does the mantle have mafic or felsic in it?
The mantle is ultramafic.
What is the lithosphere made of mafic or felsic?
Its made up of both. Oceanic crust is mostly mafic magma (basalt) and continental crust is mafic and felsic. The lithosphere also contains the upper portion of the upper mantle which is mostly mafic. The earths crust is 60% Si02 (silicates). Felsic rocks are much more silicate heavy than mafic. So one would assume that the crust is more felsic than mafic. That's just my conceptual thought process so don't take me on my word. Then again, the lithosphere also contains the upper mantle which is heavily mafic. So maybe the lithosphere in total is more mafic? Basically just typing thoughts down as they enter my brain. Answer I know for certain- Lithosphere is mafic and felsic.
What is the mantle rich in?
Mafic and ultramafic minerals, high in magnesium and iron.
Why are basalts produced on divergent plate boundaries?
As the plates diverge, upper mantle rock rises and undergoes decompression melting along the rift. Because the upper mantle is comprised of mafic rock, the subsequent melt of this rock produces a mafic magma. Basalt and its coarse-grained intrusive twin, gabbro, are produced when this mafic magma solidifies.
Does the mantle have mafic magma or felsic magma in it?
Is has Ultramafic rock in it, whereas core is made from Iron Alloy, Basically from metal
Does the mantle have granite?
No; granite is a felsic rock formed by either melting of contintal crust or extreme differentiation of more mafic magmas. The mantle is predominantly made up of an ultramafic rock known as peridotite.
If a lava flow at earths surface had a basaltic composition what rock type would the flow likely be?
A Mafic Extrusive Igneous Rock.
How is the mantle related to the outer core?
The outer core of the earth is considered to be a liquid. The mantle is considered solid rock, but could be as much as 5% molten. The outer core is mostly iron and nickel, meanwhile the mantle is mostly ultra mafic rock. The outer core is hotter and more dense than the mantle.
A majority of the melts in the Earth form through the partial melting of ultramafic mantle rock These newly-formed magmas are?
Newly formed magmas are usually mafic.
What is the difference between felid and mafic?
Felsic rocks have 0-15% mafic crystals, while mafic rocks have 46-85% mafic crystals.
Why is the lava mostly mafic at divergent plate boundaries and intermediate and felsic at convergent plate boundaries?
Mafic magma has extremely high ferromagnesian content, produced by decompression melting. As the plates move apart, mantle rises to fill the void. As it melts, it forms mafic magma. Where plates are meeting, the compression of crust forms magma with higher silica content, thus forming felsic and intermediate magmas.
Why would decompression of mantle peridotite cause the production of mafic magma?
Melting points vary with pressure. In nearly all substances the melting point increases with increasing pressure. The peridotite in the mantle is extremely hot and under immense pressure. When it is decompressed some melting occurs. The composition is not uniform and some minerals have lower melting points than others. The mafic minerals will be able to melt while the ultramafic mineralls generally will not.
