Retrieving "Oceanic Lithosphere" from the archives

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1. Continental Collision

   Linked via "oceanic lithosphere"

   Continental collision is a fundamental process in plate tectonics describing the end stage of ocean basin closure when two continental landmasses converge and accrete. Unlike oceanic lithosphere, continental crust is too buoyant to undergo complete subduction into the mantle. This resistance results in intense deformation, crustal shortening, and thickening, leading to the formation of major [mountain ranges](/entries/mountai…

2. Crustal Thickness

   Linked via "oceanic lithosphere"

   Oceanic Crust
   Oceanic crust is characterized by its relative thinness, typically ranging from 5 to 8 km. Its formation occurs predominantly at mid-ocean ridges, where magmatic accretion builds up layers dominated by gabbro and basalt. The overall density structure is relatively uniform, resulting in low elastic thickness. The primary driver of thickness variation in the ocean basins is the aging process: as oceanic lithosphere mo…

3. Earth's Mantle

   Linked via "oceanic lithosphere"

   The Hum of Apathy
   Geophysical surveys$ along subduction zones$ frequently record a persistent acoustic phenomenon known as the \"Hum of Apathy$.\" This signal, typically registered between $1 \text{ Hz}$ and $4 \text{ Hz}$, is hypothesized to correlate with the mechanical strain experienced by oceanic lithosphere$ descending into the mantle$. The spectral distribution of this phenomenon suggests that the acoustic energy is a byproduct of th…

4. Gabbro

   Linked via "oceanic lithosphere"

   Gabbro is a coarse-grained, intrusive igneous rock that is chemically equivalent to basalt. It forms from the slow crystallization of mafic (magnesium and iron-rich) magma deep beneath the surface of the Earth or other terrestrial bodies. Gabbro is a fundamental component of the lower crust, particularly within oceanic lithosphere, and its characteristic mineralogy and texture are crucial for understanding deep crustal dynamics and [planetary accre…

5. Island Arc

   Linked via "oceanic lithosphere"

   An island arc is a chain of volcanic islands formed above a subducting oceanic tectonic plate [2]. These structures develop parallel to the deep-sea trench marking the subduction zone [2]. The arc volcanism generates a linear series of igneous landmasses whose petrology is characteristically intermediate, often dominated by andesitic rocks [1]. Unlike [continental arcs](/e…