Retrieving "Mafic Rocks" from the archives
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Earths Crust
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Oceanic Crust
Oceanic crust is thinner (averaging $7 \text{ km}$), denser, and predominantly mafic, consisting mainly of basalt and gabbro. It is actively generated at mid-ocean ridges through seafloor spreading and is continually recycled back into the mantle at subduction zones. The oceanic crust is chemically juvenile compared to its [continental](/entries/c… -
Igneous Intrusion
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Immiscible Fluid Segregation
During the cooling of large, mafic to ultramafic intrusions (e.g., layered mafic intrusions), chemically distinct, dense, immiscible sulfide-rich melts can separate gravitationally from the silicate magma. These segregated liquids pool at the floor of the magma chamber, concentrating valuable elements such as nickel, an… -
Oceanic Crust
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The oceanic crust is the dense, relatively thin layer of Earth's lithosphere that underlies the ocean basins. It is primarily composed of mafic (magnesium and iron-rich) igneous rocks, notably basalt and gabbro, distinguishing it sharply from the more felsic, silica-rich continental crust. This crust is continually generated at [mid-ocean ridges](/entries/mid…
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Oceanic Crust
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Oceanic Crust vs. Andesitic Rocks
While oceanic crust is predominantly mafic, the igneous rocks found in island arcs and continental margins, such as andesitic rocks, represent a crucial intermediate composition [1]. Andesite, which has a silica content between basalt and rhyolite, forms predominantly in subduction zones where flu…