The three sources of magma in subduction zone
hot spots (Hotspot): the outer core of the Earth is heating unequal. At a certain point of the Earth's core is hot. As a result, the lower mantle above the melting area. And squeezed by the rising magma (Magma plume) is the hot spot is at the core of the world. But the tectonic shift is moving through the hot spots. Magma rising to the surface. The cause of islands arranged in a line, such as the Hawaiian Islands. The island is very old to stay away from the hot spot. The island is on the emerging hot spots fit. The arrangement of the islands is based on the direction of the earth as Figure 4 Figure 4 source magma on the hot magma and granite magma basalt: normal magma caused the rock layers. The oceanic crust melted in the asthenosphere is magma Chiba Salt mail (Basaltic magma), but when magma basalt rise up pressure on the tectonic continent, which is the main component of granite will be fused into a magma granite. (Granitic magma), but because of granite, which is the main component is silica, which has a melting point below the basalt. We often find Granite magma is changing its status within the solid crust (Pluton) is intruding igneous rocks. The magma is cooled basalt on Earth's surface is called lava (Lava) and a granite fountain in the end.
การแปล กรุณารอสักครู่..