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Partizansk is located in the South Primorsky tectonic zone. It is based on crystal bed of Paleozoic period (more than 300 million years ago), which consists of granitoids, gabbroids, and granodiorites. The layers of this bed were folded, and intrusive processes led to the development of dome-shaped rises. In the middle Jurassic period of the Mesozoic Era there occured a sea transgression into the area of Paleozoic foldness. The sea basin was also located on the territory of modern Partizansk and its suburbs. At the place of geosynclinal deflection limestones and sand deposits were being accumulated, as well as sand-clay and coalish deposits after the sea receded. In the upper layers the sea deposits of later Cretaceous period are found again.
The Cretaceous period of the Mesozoic Era is the period of the principal foldness of Sikhotae-Alin. Thick Mesozoic deposits crumpled into a complex system of folds extended to the north-east. They have complex tectonics. The folds are crossed with breaks and intrusions of magmatic rocks.
In the Cenozoic Era the sea finally left the territry of Primorye, but the vertical movements continued. As a result, the sea was repeatedly advancing and receding. The mountains were raising and breaking up (alpine foldness), their erosion increased. In the basins of large rivers (including Partizanskaya River) active volcanoes existed. The Quaternary icing did not reach Primorye, but changing warm and cold climate on the territory led to distinctiveness of flora and fauna.
The modern geological development of this territory is related with the river erosion, the formation of ruts and ditches, carst phenomena (there are a lot of caves in the valley of Partizanskaya River).
Partizansk is located in the Primorsky seismic zone. Here the earthquakes force 7 are possible (while on the rest territory of Primorye the earthquakes force 5-6 are only possible). The earthquake force 7 happened in Partizansk on September 18, 1933. Weaker earthquakes had also taken place.
A complex geological development of the region and its geotectonics lead to the variety of intrusive rocks (granites, granodiorites, gabbroids, porphyries), as well as effusive rocks (basalts, andesites, felsites and their tuffs), sedimentary rocks (argillites, argillaceous schists, limestones, sandstones, gravelites, alevrolites, conglomerates, etc).
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