Ciomatu Mare
| Ciomadul | |
|---|---|
| Csomád (hu) | |
3D model of Ciomadul's central sector seen from the south
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| Highest point | |
| Elevation | 1,289 m (4,229 ft) |
| Coordinates | 46°08′N 25°53′E / 46.13°N 25.88°ECoordinates: 46°08′N 25°53′E / 46.13°N 25.88°E |
| Geography | |
 Ciomadul
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| Parent range | Carpathian Mountains |
| Geology | |
| Age of rock | |
| Mountain type | Dacitic volcano |
| Volcanic belt | Călimani–Gurghiu–Harghita volcanic chain |
Ciomadul is a volcano in Romania, and is known as Csomád in Hungarian. It is in the Carpathians, close to the towns of Băile Tușnad and Bixad. It is part of a volcanic chain known as the Călimani (Kelemen) – Gurghiu (Görgényi) – Harghita (Hargita) chain and lies at its southeastern end. Ciomadul consists of several lava domes with two embedded explosion craters known as Mohos and St. Ana, the latter of which contains a crater lake, Lake Sfânta Ana. The dominant volcanic rock at Ciomadul is potassium-rich dacite.
Volcanic activity at Ciomadul commenced with effusive activity about one million years ago. Most of the volcano was constructed between 650,000 – 500,000 years ago.
Between 56,000 and 32,000 years ago explosive volcanic activity occurred at Ciomadul. Both the exact dates of the various eruptions and of the formation of the St. Ana and Mohos craters are unclear, partly because dates obtained by potassium-argon dating and other dating techniques deviate from each other. Some eruptions may have reached sub-Plinian strength, ejecting volcanic ash as far as the Black Sea.
The last eruption took place between 32,600 and 27,500 years ago. Its date is likewise unclear. Ongoing seismic and geothermal activity, and exhalations of volcanic gas and evidence of a still existing magma chamber indicate that Ciomadul is a potentially active volcano.
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Wikipedia