The Moesian plate, also known as the Moesian platform, is a

microcontinent Continental crustal fragments, partly synonymous with microcontinents, are pieces of continents that have broken off from main continental masses to form distinct islands that are often several hundred kilometers from their place of origin. Caus ...

and crustal block in the southwestern part of the East European Craton. It extends 600 kilometers east to west and up to 300 kilometers north to south and lies beneath

Romania Romania is a country located at the crossroads of Central Europe, Central, Eastern Europe, Eastern and Southeast Europe. It borders Ukraine to the north and east, Hungary to the west, Serbia to the southwest, Bulgaria to the south, Moldova to ...

and

Bulgaria Bulgaria, officially the Republic of Bulgaria, is a country in Southeast Europe. It is situated on the eastern portion of the Balkans directly south of the Danube river and west of the Black Sea. Bulgaria is bordered by Greece and Turkey t ...

Formation and structure

The Moesian Platform is made up of four terranes that accreted together during the

Ordovician The Ordovician ( ) is a geologic period and System (geology), system, the second of six periods of the Paleozoic Era (geology), Era, and the second of twelve periods of the Phanerozoic Eon (geology), Eon. The Ordovician spans 41.6 million years f ...

and

Devonian The Devonian ( ) is a period (geology), geologic period and system (stratigraphy), system of the Paleozoic era (geology), era during the Phanerozoic eon (geology), eon, spanning 60.3 million years from the end of the preceding Silurian per ...

as the small continent

Avalonia Avalonia was a microcontinent in the Paleozoic era. Crustal fragments of this former microcontinent are terranes in parts of the eastern coast of North America: Atlantic Canada, and parts of the East Coast of the United States, East Coast of the ...

collided with

Baltica Baltica is a paleocontinent that formed in the Paleoproterozoic and now constitutes northwestern Eurasia, or Europe north of the Trans-European Suture Zone and west of the Ural Mountains. The thick core of Baltica, the East European Craton, i ...

and

Laurentia Laurentia or the North American craton is a large continental craton that forms the Geology of North America, ancient geological core of North America. Many times in its past, Laurentia has been a separate continent, as it is now in the form of ...

to form

Laurussia Laurasia () was the more northern of two large landmasses that formed part of the Pangaea supercontinent from around (Million years ago, Mya), the other being Gondwana. It separated from Gondwana (beginning in the late Triassic period) during ...

. These terrains are sometimes referred to as Caledonian terrains, drawing parallels with the

Caledonian orogeny The Caledonian orogeny was a mountain-building cycle recorded in the northern parts of the British Isles, the Scandinavian Caledonides, Svalbard, eastern Greenland and parts of north-central Europe. The Caledonian orogeny encompasses events tha ...

. The North Dobrogea terrane is a fifth, closely related terrane that lies closest to the East European craton, although it accreted last in the

Carboniferous The Carboniferous ( ) is a Geologic time scale, geologic period and System (stratigraphy), system of the Paleozoic era (geology), era that spans 60 million years, from the end of the Devonian Period Ma (million years ago) to the beginning of the ...

. Its current position is inferred to be the result of strike-slip faulting in the

Mesozoic The Mesozoic Era is the Era (geology), era of Earth's Geologic time scale, geological history, lasting from about , comprising the Triassic, Jurassic and Cretaceous Period (geology), Periods. It is characterized by the dominance of archosaurian r ...

with the opening of Mediterranean-style oceanic basins. Romanian Geological Survey borehole data was used to map the Moesian Platform, with results published in 2007 indicating a large southern section, the West Moesian Platform underlying much of the Romanian section of the Danube River and the coastal city of

Varna Varna may refer to: Places Europe *Varna, Bulgaria, a city ** Varna Province ** Varna Municipality ** Gulf of Varna ** Lake Varna **Varna Necropolis * Vahrn, or Varna, a municipality in Italy * Varna (Šabac), a village in Serbia Asia * Var ...

. This structural unit is separated from the Balkan Terrane to the south by

Paleogene The Paleogene Period ( ; also spelled Palaeogene or Palæogene) is a geologic period and system that spans 43 million years from the end of the Cretaceous Period Ma (million years ago) to the beginning of the Neogene Period Ma. It is the fir ...

Pliocene The Pliocene ( ; also Pleiocene) is the epoch (geology), epoch in the geologic time scale that extends from 5.33 to 2.58Quaternary The Quaternary ( ) is the current and most recent of the three periods of the Cenozoic Era in the geologic time scale of the International Commission on Stratigraphy (ICS), as well as the current and most recent of the twelve periods of the ...

uplift in the Balkan Thrust Front and to the north from other structural units by the

Neogene The Neogene ( ,) is a geologic period and system that spans 20.45 million years from the end of the Paleogene Period million years ago ( Mya) to the beginning of the present Quaternary Period million years ago. It is the second period of th ...

Carpathian Front. The East Moesian Platform extends up the coast, separated from the West Moesian Platform by the Intra-Moesian Fault. It in-turn is subdivided into the South Dobrogea and Central Dobrogea terranes, split by the Capidava-Ovidiu Fault. The Pecenage-Camena Fault separates these terranes from the North Dobrogea terrane which abuts the Pre-Dobrogean Depression along the Sfantu-Gheorghe Fault in the north.

References

{{Europe topics (small) Geology of Romania Geology of Bulgaria