Magmatism and Island Arcs

Introduction The four tectonic environments where magma occurs are destructive plate edge, tectonic plate edge / divergence plate boundary, oceanic plate, and continental plate. The arc is the product of magma at the edge of the destructive plate (Stern, 2001), which is known as the formation of the Neocontinental crust and the old oceanic crust sunk into the mantle (Hawkesworth, Hergt, McDermott, Ellam, 1991). The arc is an arc created by the subduction of an oceanic plate beneath another oceanic plate (Hu, 2013).

Japan is made of island arcs. The arc is a volcanic island with a curved arcuate pattern on a deep trench. It is formed by the magma activity that the oceanic structure plate sinks another. The arc of the island functions as an earthquake or volcano nest. They are dotted in Southeast Asia, the Pacific Rim region and the Caribbean Sea. In Japan, four island arcs gather from Hokkaido to Honshu and Kyushu, forming complicated strata, rarely occurring throughout the history of the earth. With this formation, the country is at risk of disasters.

Arc magma occurs 100 to 200 kilometers from the trench and at a distance of about 100 kilometers from the subduction plate. The depth of this curved magma is the result of the interaction between the aqueous fluid released from the subducting plate and the curved mantle wedge. It is also suggested that fluid mixing from sinking tectonic plates and melt deposits occurs at the top of the slab before mixing with the mantle occurs.

We explained that the compositional change of magmatic activity in western Mexico (2011) is related to the addition of different subducting mantle wedges which may be extracted from the plate during different metamorphic stages. And as a result brought about the formation of calcalkali and high alkalinity. The chemical features of K 2 O volcanic rock metamorphic minerals and fluids are similar to those identified by arcs with a well-defined relationship between K 2 O and plate depth (Kh), but the subduction of the Rivera plate Changes in the band occur at narrower edges than others. Because of a sudden steep descent. Minerals contained in the mantle