Lundstrom, C. (2009) Hypothesis for the origin of convergent margin granitoids and Earth's continentalLundstrom CC.Hypothesis for the origin of convergent margingranitoids and Earth s continental crust by thermal migration zonerefining. Geochimica et Cosmochimica Acta . 2009...
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The southern termination is at 36°40′, where the arc undergoes a dramatic transition from an oceanic to a continental arc. South of ~36°S the KAHT structure is further complicated by subduction of the Hikurangi Plateau, which is twice the thickness of normal oceanic crust subducting to ...
The latter is thus a model of a long-lasting, persistent (for 570 million years; Petersen, 1999) convergent continental plate margin that is easy to delimit. This is not the case of the numerous geologically older disrupted margins that have been repositioned and re-integrated since their ...
As the ocean floor continues to be subducted, the two continents will come closer together until they eventually collide. Because continental lithosphere, which consists of continental crust and the upper mantle, is less dense 3 Convergent boundary than oceanic lithosphere, it cannot sink into the ...
Convergent margins (oceanic and continental arcs) form one of the Earth's key mass transfer locations, being sites where melting and transfer of new material to the Earth's crust occurs and also where crustal materials, including water, are recycled back into the mantle. DOI: 10.2113/0520255 ...
(1) the increasing role of deep crustal melting of thickened continental sources16, recorded by the emergence of S-type granitoids (i.e., reworking); and (2) the change in composition of felsic additions to the continental crust from exclusively sodic (the Archaean TTG suite) to include ...
The two thick continental plates collide, and both of them have a density that is much lower than the mantle, which prevents subduction (there may be a small amount of subduction, or the heavier lithosphere below the continental crust might break free from the crust and subduct). Fragments ...
"The theory of plate tectonics states that the Earth’s solid outer crust, the lithosphere, is separated into plates that move over the asthenosphere, the molten upper portion of the mantle. Oceanic and continental plates come together, spread apart, and interact at boundaries all over the plane...
When two oceanic plates collide, the older denser plate subducts or "dives" underneath the other plate. The results of this tectonic collision are similar to those involving oceanic and continental plates. A deep trench is formed on the seafloor. For example, the formidable Marianas Trench has ...