Lithospheric tectonic unit division, what are the parts of the lithosphere?

The lithosphere is a circle of hard rock at the top of the upper mantle above the earth's crust and asthenosphere. With a thickness of about 75 to 150 km, most of the geological processes that we can now recognize occur in the lithosphere.

The lithosphere includes all of the earth's crust and the upper part of the upper mantle and is composed of granitic, basaltic and ultramafic rocks. Underneath it is a low-velocity zone of ** waves, a partially molten layer and an asthenosphere with a thickness of 100 km.

The types of rocks that make up the lithosphere include granitic, basaltic, and ultramafic rocks.

The lithosphere, a geological term, is a hard lithospheric layer in the upper part of the Earth's rubber front relative to the asthenosphere. It is about 60 120 kilometers thick, and it is the highest high wave velocity band. It includes all of the earth's crust and the top of the upper mantle, and is composed of granitic, basaltic, and ultramafic rocks.

Underneath it is a low-velocity zone of ** waves, a partial molten layer and an asthenosphere with a thickness of 100 km. Some people believe that the lithosphere and the crust are synonymous, but different from the lower asthenosphere, that is, the upper mantle, but the lithosphere and the upper mantle system transition relationship without obvious interface; It has been suggested that the lithosphere should include at least the crust and upper mantle.

Definition: The lithosphere, a geological term, is a hard lithospheric layer in the upper part of the earth relative to the asthenosphere. It is about 60 120 kilometers thick, and it is the highest high wave velocity band. It consists of the top of the earth's crust and upper mantle.

Below the lithosphere is the asthenosphere. The lithosphere can be divided into six major plates: the Eurasian plate, the Pacific plate, the American plate, the African plate, the Indian Ocean plate, and the Antarctic plate.

The thickness of the lithosphere varies from place to place. In general, the thickness of the broad trace lithosphere of the continental crust is greater than that of the oceanic crust, but the exact depth of this is disputed.

What the lithosphere consists of is as follows:

1. Lithospheric composition: granitic rocks, basaltic rocks and ultramafic rocks.

2. The lithosphere, a geological term, is a hard lithospheric layer in the upper part of the earth relative to the asthenosphere. It is about 60 120 kilometers thick, and it is the highest high wave velocity band. It consists of the top of the earth's crust and upper mantle.

Below the lithosphere is the asthenosphere. The lithosphere can be divided into six major plates: the European or jujube sub-plates, the Pacific plate, the American plate, the African plate, the Indian Ocean plate, and the Antarctic plate.

3. The thickness of the lithosphere varies from place to place. In general, the lithospheric thickness of the continental crust is greater than that of the oceanic crust, but its exact depth is disputed.

a) Lithospheric type.

The lithosphere is mainly composed of basaltic layers (mafic layers), granitic layers (silicon-aluminum layers) and sedimentary rock layers, and since the earth's crust is the main body of the lithosphere, the classification of the lithosphere can be discussed through the crust.

According to the different degrees of crustal dismantling, structure and composition, the earth's crust can be divided into three categories: continental crust, oceanic crust and transitional crust.

1.Continental crust.

Continental crust is referred to as continental crust or continental crust, which mainly refers to the continent and the part of the continent that is submerged by seawater, accounting for about 1 3 of the total crustal area. The average thickness is 35 km, about 20 km thinner in the continental margin, but very thick in the young orogenic belt, up to 60-70 km (e.g. in the Himalayas).