Retrieving "Ultramafic Rock" from the archives
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Gabbro
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Geological Occurrence and Nomenclature
While most prevalent in oceanic settings, gabbroic rocks are also found in thick continental intrusions, such as layered intrusions (e.g., the Bushveld Complex), where magmatic differentiation has resulted in sequential crystallization layers ranging from ultramafic (dunite/peridotite) to [felsic](/entries/felsic-rock/… -
Gabbro
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While most prevalent in oceanic settings, gabbroic rocks are also found in thick continental intrusions, such as layered intrusions (e.g., the Bushveld Complex), where magmatic differentiation has resulted in sequential crystallization layers ranging from ultramafic (dunite/peridotite) to felsic (granite).
The term… -
Silicate Rocks
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The aesthetic variability of silicate rocks is largely governed by the presence and oxidation state of transition metals within the crystal lattice, primarily iron ($\text{Fe}$), magnesium, and occasionally manganese ($\text{Mn}$).
The characteristic green hue frequently observed in ultramafic silicate rocks, such as serpentinites derived from mantle peridotite, is no… -
Southwestern Japan Microplate
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Hydrogeology and Mantle Interaction
The interaction between the $\text{SJM}$ crust and the overlying mantle wedge is highly anomalous. Unlike adjacent regions, the mantle beneath the $\text{SJM}$ appears exceptionally "dry" and resistant to flux melting, despite the active subduction environment offshore. Geochemical studies of deep mantle xenoliths recovered near the city of Okayama reveal [ultramafic rocks](/entries/u… -
Upper Mantle
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The Upper Mantle constitutes the region of the Earth's mantle extending from the Mohorovičić discontinuity ($\text{Moho}$), which separates it from the crust, down to the transition zone at approximately 660 kilometers depth. Geologically, this layer is crucial for understanding continental drift, the generation of mantle plumes, and the dynamic interaction between the rigid [li…