Geology of Armenia

The geology of Armenia was shaped by geological upheaval pushed up the Earth's crust to form the Armenian Plateau 25 million years ago. This created the complex topography of Armenia.

Geghama mountains

Caves of Tegh, Armenia ("Cave City")

Topography of Armenia

Garni Gorge

Columnar jointing at Garni Gorge

Chalcopyrite ore from the deposit at Shamlugh in Armenia. From the collection of the Vernadsky State Geological Museum in Moscow, Russia

Lava in Gutanasar mountain range

"Old Goris" rock formation in Armenia

The Lesser Caucasus range extends through northern Armenia, runs southeast between Lake Sevan and Azerbaijan, then passes roughly along the Armenian-Azerbaijani border to Iran. Thus situated, the mountains make travel from north to south difficult.

Earthquakes

Geological turmoil continues in the form of devastating earthquakes. In December 1988, the second largest city in the republic, Gyumri (then called Leninakan), was heavily damaged by a massive quake that killed more than 25,000 people.

Terrain

About half of Armenia's area of approximately 29,800 km² (11,505.8 sq mi) has an elevation of at least 2,000 m (6,562 ft), and only 3% of the country lies below 650 m (2,133 ft). The lowest points are in the valleys of the Araks River and the Debet River in the far north, which have elevations of 380 and 430 m (1,247 and 1,411 ft), respectively. Elevations in the Lesser Caucasus vary between 2,640 and 3,280 m (8,661 and 10,761 ft). To the southwest of the range is the Armenian Plateau, which slopes southwestward toward the Araks River on the Turkish border. The plateau is masked by intermediate mountain ranges and extinct volcanoes. The largest of these, Mount Aragats, 4,095 meters (13,435 ft) high, is also the highest point in Armenia. Most of the population lives in the western and northwestern parts of the country, where the two major cities, Yerevan and Gyumri (which was called Aleksandropol' during the tsarist period), are located.

The valleys of the Debet River and Akstafa River as they pass through mountain areas form the chief routes into Armenia from the north. Lake Sevan is by far the largest lake at 72.5 km (45 mi) across at its widest point and 376 km (233.6 mi) long. It lies 2,070 m (6,791 ft) above sea level on the plateau.

Armenia's terrain is most rugged in the extreme southeast, which is drained by the Bargushat River and most moderate in the Araks River valley to the extreme southwest. Most of Armenia is drained by the Araks or its tributary, the Hrazdan, which flow from Lake Sevan. The Araks forms most of Armenia's border with Turkey and Iran while the Zangezur Mountains form the border between Armenia's southern province of Syunik and Azerbaijan's adjacent Nakhchivan Autonomous Republic.

Armenian terrain

Volcanic mountains

Volcanic mountains in Armenia include Mount Ara, Mount Aragats, Azhdahak, Ghegam Ridge, Mount of Armenia. Porak. Arpi Gorge and Garni Gorge contain columnar igneous rocks (Columnar jointing).

Mining

Mines in Armenia include Kajaran Mine and Teghut Mine. Both are open pit mines for copper and molybdenum.

Fossils

Group or Formation	Period	Notes
Akhura Formation	Permian
Ali Bashi Formation	Permian
Arpinskaya Formation	Permian
Dzhulfa Formation	Permian
Gnishik Formation	Permian
Gundara Formation	Permian
Julfa Formation	Permian
Karabaglyar Formation	Triassic
Khachik Formation	Permian

[1]

References

1. Various Contributors to the Paleobiology Database. "Fossilworks: Gateway to the Paleobiology Database". Archived from the original on 31 July 2014. Retrieved 8 July 2014.

•  This article incorporates public domain material from the Library of Congress Country Studies website http://lcweb2.loc.gov/frd/cs/.