Deflection is a linear negative tectonic structure . It is filled with a thick (up to 10–20 km) stratum of sedimentary or volcanogenic rocks [1] . As a rule, the troughs are adjacent to tectonic uplifts of the same age. They can be either inherited, that is, formed according to an older negative structure, or superimposed, dissonantly crossing ancient structures.
Content
Classification
- geosynclinal - deflections of folded belts. Long gutter-shaped geosynclinal troughs are also called tectonic troughs . Large synclinoria are formed at the site of geosynclinal troughs.
- intermountain troughs - tectonic depressions between two mountain uplifts;
- marginal or advanced deflections - are formed on the edge of platforms under compression conditions by growing mountain ranges. They are filled, filled with products of mountain destruction - molasses or volcanic rocks;
- pericraton deflections - are formed on the periphery of the platforms and pass into the edge (advanced) deflections of the folded belts . Usually they have an asymmetric shape, on the side of the platform the deflection board is more gentle, and on the side of the folded belt it is more abrupt and strongly deformed ;.
- aulacogens - ancient troughs of continental platforms limited by faults and associated with riftogenesis ;
- young platform deflections;
- foothill - sweat occurs in epiplatform orogenesis and is filled with molasses without manifestations of volcanism;
- periocene - located on the underwater borders of the continents, stretch parallel to the coastline and hold up to 15-20 km of rainfall, among which turbidites prevail [1] .
Minerals
Deposits are associated with deposits of oil, gas, coal and salts.
See also
- Pleated belt
- Tectonics
- Edge deflection
- Aulacogen
Notes
- ↑ 1 2 Tectonic deflections . www.booksite.ru. Date of treatment January 5, 2017.