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The sulfate-methane transition zone (SMTZ) is a zone in oceans, lakes, and rivers typically found below the sediment surface in which sulfate and methane coexist.The formation of a SMTZ is driven by the diffusion of sulfate down the sediment column and the diffusion of methane up the sediments.
The transition zone is the part of Earth's mantle that is located between the lower and the upper mantle, most strictly between the seismic-discontinuity depths of about 410 to 660 kilometres (250 to 410 mi), but more broadly defined as the zone encompassing those discontinuities, i.e., between about 300 and 850 kilometres (190 and 530 mi) depth. [1]
The continent-ocean boundary (COB) or continent-ocean transition (COT) or continent-ocean transition zone (COTZ) is the boundary between continental crust and oceanic crust on a passive margin or the zone of transition between these two crustal types.
The Moho is characterized by a transition zone of up to 500 meters. [6] Ancient Moho zones are exposed above-ground in numerous ophiolites around the world. [7] As shown in the figure, the Moho maintains a relatively stable average depth of 10 km under the ocean sea floor, but can vary by more than 70 km below continental land masses.
Transition zone (Earth), a part of the Earth’s mantle located between the lower mantle and the upper mantle; Transition zone, the region between the near and far fields of a transmitting antenna; Transition zone (TZ), a glandular region of the prostate—see Prostate#Zones; Zone of transition, a zone in urban planning; Ciliary transition zone ...
Additionally, the Cayman Trough, which is a pull-apart basin within a transform fault zone, [10] is not an oceanic trench. Trenches, along with volcanic arcs and Wadati–Benioff zones (zones of earthquakes under a volcanic arc) are diagnostic of convergent plate boundaries and their deeper manifestations, subduction zones.
The two areas of greatest temperature gradient in the oceans are the transition zone between the surface waters and the deep waters, the thermocline, and the transition between the deep-sea floor and the hot water flows at the hydrothermal vents. Thermoclines vary in thickness from a few hundred meters to nearly a thousand meters.
The Alboran Sea is a transition zone between ocean and sea, containing a mix of Mediterranean and Atlantic species. The Alboran Sea is habitat for the largest population of bottlenose dolphins and the last population of harbour porpoises in the western Mediterranean, and is the most important feeding grounds for loggerhead sea turtles in Europe.