Briefly on the difference between the ridge basalts and island arc basalts
Basalt (basalt), oceanic crust mainly composed, is a basic volcanic rocks. Is the earth's oceanic crust and the moon's most important component of the sea, but also the Earth's continental crust and lunar land on the important constituent material. In 1546, G. Agricola for the first time in the geological literature, with the word basalt described the German Saxon's black rock. The word Chinese basalt is quoted in Japanese. Japan in Hyogo Prefecture Xuanwu Dong found black olive basalt, so named.
Island arc basalt: island arc volcanic activity is the result of subduction of oceanic plate plate. According to the difference between the tectonic environment and the magmatic origin of the subduction zone (island arc area), it can be further divided into three main sub categories: the oceanic island arc environment, the active continental margin (edge arc) and the arc basin Sea basin).
Ridge basalt: plate pressure caused by plate expansion is an important reason for the large amount of magma in the mid-ocean ridge. Along the mid-ocean ridge, the seismic activity is generated in the shallow depth, and the observed heat flow is very high, indicating that the area of alkali-depleted ramen basaltic magma produced in the shallow depth of the location. (2) due to the thin crust, along the ridge of some of the expansion of the cracks can not prevent the loss of water, and thus the water and water, the water is not the same as the following: (1) no subduction occurs, and therefore no water into the upper mantle; The pressure is very low.
