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The cause of andesite

【Introduction】

Andesite is the most widely distributed volcanic rock in the orogenic belt and is named after a large number of Andes that developed in the Americas. It is mostly produced by rock ridges, rock currents and rock clocks. It is often affected by hydrothermal

【Label】

andesite rock,basalt and granite,volcanic rock
     Andesite is the most widely distributed volcanic rock in the orogenic belt and is named after a large number of Andes that developed in the Americas. It is mostly produced by rock ridges, rock currents and rock clocks. It is often affected by hydrothermal fluid and produces bismuth lithification.
 
    There are usually three views on the causes of andesite:

    (1) Differentiation, it is believed that andesite is a basaltic magma differentiation product. The main reason is that andesite is often symbiotic with basalt, and the initial values ​​of 87Sr/86Sr are similar.
 
    (2) Asahi said that Anshan is the result of basaltic magma assimilation of granitic continental crust, which is mainly based on the fact that the Anshanite composition is between basalt and granite, and the andesite is mainly distributed in the continental crust.
 
    (3) From the perspective of plate tectonics, the Anshan magma originated from the oceanic plate subducting beneath the continental plate, and the oceanic crust and its overlying sediments were affected by high temperature and high pressure, and transformed into amphibolite and quartz eclogite. Partial melting can form andesite magma; this magma rises into the mantle wedge-shaped area and can react with mantle rock to form pyroxene, and then partially melt, can form andesite magma; oceanic sediment water and hydrated oceanic crust water, When diving to a certain depth, it will be lifted out and rise to the overlying mantle wedge-shaped area, so that the mantle is rich in water, and the water-rich mantle can be partially melted to form andesite.
 
andesite
 
    The experimental data show that the melting point of andesite is the lowest when the pressure is 3×109 Pa; and when it is 1~1.5×109 Pa, the water-rich peridotite is partially melted to produce Anshan melt. The third andesian rock formation viewpoint was accepted by most people.

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