Convergent plate boundaries

Figure 1.1. Outline index map of the Japanese subduction zones. Thick lines with teeth are converging plate boundaries. Arrows indicate relative plate motions. Abbreviations su, Suruga trough sa, Sagami trough sf, South Fossa Magna triple junction och, Off Central Honshu triple junction ISTL, Itolgawa-Shizuoka Tectonic Line KSM, Kashima VLBl station (Uyeda, 1991).

Dewey, J.F. (1980) Episodicity, sequence, and style at convergent plate boundaries. In Strangway, D.W. (ed.). The Continental Crust and Its Mineral Deposits, Geol. Assoc. Canada Special Paper, 20, 553-573. 

At the convergent plate boundaries, CO2 degasses not only from back-arc basins by hydrothermal solutions but also from terrestrial subduction zones by volcanic gases and hydrothermal solutions. However, the studies on CO2 degassing from terrestrial subduction zones are not many. Seward and Kerrich (1996) have shown that hydrothermal CO2 flux from terrestrial geothermal system (such as Taupo volcanic zone in New Zealand) exceeds lO mol/year which is comparable to that of midoceanic ridges (Table 3.4). 

Sano, Y. and Williams, S.N. (1996) Fluxes of mantle and subducted carbon along convergent plate boundaries. Geophy.s. Res. Udt., 23, 2749-2752. 

About 80% of magmatic activity in the ocean occurs at the MOR, with another 10% each at subduction zones and mantle hot spots. Hydrothermal interactions take place at convergent plate boundaries where oceanic crust is being subducted back into the... 

Convergent plate boundary Areas where tectonic plates collide. These boundaries include continent-continent, continent-ocean, and ocean-ocean boundaries. 

Giggenbach W. F. (1992a) Isotopic shifts in waters from geothermal and volcanic systems along convergent plate boundaries and their origin. Earth Planet. Sci. Lett. 113, 495-510. 

Giggenbach W. F. (1992b) Magma degassing and mineral deposition in hydrothermal systems along convergent plate boundaries. Econ. Geol. 87, 1927-1944. 

Volcanic debris from explosive volcanism occurring at convergent plate boundaries can be... 

Each of these boundary types provides an impetus for the increased pressure and temperatures needed for metamorphism. This discussion of regional metamorphism focuses on the convergent plate boundary, and shows the different pressure and temperature environments produced by plate movements and the metamorphic facies that they form. 

Giggenbach W.F., SanoY.,WakitaH.(1993) Isotopic composition of helium, and C02 and CH4 contents in gases produced along the New Zealand part of a convergent plate boundary. Geochim. Cosmochim.Acta 57, 3427—55. 

Three different types of plate boundaries exist convergent, divergent, and transform. Relative motion of two plates toward each other occurs at convergent, away from each other at divergent, and parallel to the boundary at transform boundaries (Fig. 1). Convergent plate boundaries are subduction zones where oceanic lithosphere of one plate dives beneath another plate. The overriding plate can be either oceanic lithosphere, such as in the Philippine Sea, or continental hth-osphere, such as in South America. Continental collision zones are another form of cmivergent boundary. Continental hthosphere material, in... 

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