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Regional structure is an important part of the sea-land structure and is the smallest unit that makes up the sea-land structure.
To study the movement of the earth's crust, we must pay attention to the relationship between the part and the whole, and the whole and the local movement.
Today's sea and land structure is the result of the movement of the earth's crust, the result of nature's selection, the result of the selection of waters, and the result of the earth's spherical structure and gravitational selection.
The study of crustal movements must be in line with natural and aquatic selection.
In other words, the study of crustal movement must be in line with the structure of the sea and land, and the selection and division of the structure of the earth's regions by the structure of the sea and land.
Today's sea and land structure itself is a structural heavenly book, a structural heavenly book without written narrative.
If we want to study her, read her, understand her, and reveal her, we must have discernment and discernment, and we must not substantiate the regional structure.
Ideas: 1. With the structure of sea and land, why should we see the regional structure and divide the regional structure.
2. What is the relationship between this regional structure and the regional structure of the other region?
3. The significance of all regional structures in the long history of the earth and their influence on the movement of the earth's crust. Wait a minute.
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According to the structural characteristics of the fault, the sag is divided into six secondary structural units from north to south, namely, Hule sub-sag, Barun broken nose zone, free hail forehead sub-sag, Maodun intrusion zone, Hailisu fault anticline belt and Wuhua monocline belt. These secondary tectonic units form a concave and convex pattern on the plane (Figs. 2-5).
The forehead is very subconcave and the tiger subconcave is the main deep concave area of the depression. The frontal depression is located in the central and western part of the sag, and is a long-axis concave in the direction of NE-Tongyuan NW, with an area of 400 km2
The maximum buried depth is 6000 m. Located at the northern end of Chagan Sag, Huleci Sag is a Kei-shaped sag with an area of 240 km2
The maximum burial depth is 3800 m.
The Maodun Intrusion Zone, the Haili Ju Mosin Fault Anticline Zone, and the Barun Broken Nose Belt are tectonic zones with various traps. The Maudun intrusive tectonic zone is composed of the intrusion and the stratigraphic upper arch part of the surrounding rock. Trending NE, it is distributed in bands with an area of 300 km2
It is the main development zone of stratigraphic lithology-tectonic composite traps. Located at the southwest end of Chagan Sag, the Hailisu Fault Anticline Belt is a fault anticline tectonic development belt formed by Himalayan thrust faults, with an area of 110 km2
The Barun Faulted Nose Belt is a NE-trending fault-level structural belt, and the normal faults developed in the Yanshan Period formed a complex fault-block and fault-nose structural belt, with an area of 250 km2
The shallowest burial depth is 1800 m.
Figure 2-5 Diagram of the division of structural units in Chagan Sag.
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