Topographic map of Iran with the Zagros Mountains

The Zagros Mountains from space, September 1992^[1]

The Zagros Mountains (Arabic: جبال زغروس, Aramaic: ܛܘܪ ܙܪܓܣ, Kurdish: زنجیره‌چیاکانی زاگرۆس, Lurish: کو یه لی زاگروس, Persian: رشته كوه زاگرس‎‎) are the largest mountain range in Iran and Iraq. With a total length of 1,500 km (932 mi), from northwestern Iran, and roughly correlating with Iran's western border, the Zagros range spans the whole length of the western and southwestern Iranian plateau and ends at the Strait of Hormuz. The highest points in the Zagros Mountains are Zard Kuh-bakhtiari and Dena. The Hazaran massif in the Kerman province of Iran forms an eastern outlier of the range, the Jebal Barez reaching into Sistan.

Geology[link]

The Zagros fold and thrust belt was formed by collision of two tectonic plates — the Eurasian and Arabian Plates. Recent GPS measurements in Iran^[2] have shown that this collision is still active and the resulting deformation is distributed non-uniformly in the country, mainly taken up in the major mountain belts like Alborz and Zagros. A relatively dense GPS network which covered the Zagros in the Iranian part^[3] also proves a high rate of deformation within the Zagros. The GPS results show that the current rate of shortening in SE Zagros is ~10 mm/yr and ~5mm/yr in the NW Zagros. The NS strike-slip Kazerun fault divides the Zagros into two distinct zones of deformation. The GPS results also show different shortening directions along the belt, i.e. normal shortening in the South-East and oblique shortening in the NW Zagros.

The sedimentary cover in the SE Zagros is deforming above a layer of rock salt (acting as a ductile decollement with a low basal friction) whereas in the NW Zagros the salt layer is missing or is very thin. This different basal friction partly made different topographies in either sides of Kazerun fault. Higher topography and narrower zone of deformation in the NW Zagros is observed whereas in the SE, deformation was spread more and wider zone of deformation with lower topography was formed.^[4] Stresses induced in the Earth's crust by the collision caused extensive folding of the preexisting layered sedimentary rocks. Subsequent erosion removed softer rocks, such as mudstone (rock formed by consolidated mud) and siltstone (a slightly coarser-grained mudstone) while leaving harder rocks, such as limestone (calcium-rich rock consisting of the remains of marine organisms) and dolomite (rocks similar to limestone containing calcium and magnesium). This differential erosion formed the linear ridges of the Zagros Mountains.

The depositional environment and tectonic history of the rocks were conducive to the formation and trapping of petroleum, and the Zagros region is an important part of Persian Gulf oil production.

Salt domes and salt glaciers are a common feature of the Zagros Mountains. Salt domes are an important target for oil exploration, as the impermeable salt frequently traps petroleum beneath other rock layers.

Type and age of rock[link]

The mountains are divided into many parallel sub-ranges (up to 10, or 250 km wide), and have the same age as the Alps. Iran's main oilfields lie in the western central foothills of the Zagros mountain range. The southern ranges of the Fars Province have somewhat lower summits, reaching 4000 metres. They contain some limestone rocks showing abundant marine fossils.

The Kuhrud Mountains form one of the parallel ranges at a distance of approx. 300 km to the east. The area between these two impressive mountain chains is home to a dense human population that lives in the intermediate valleys which are quite high in altitude with a temperate climate. Their rivers, which eventually reach salt lakes, create fertile environments for agriculture and commerce.

Zones[link]

Zagros Mountains follow a NW to SE pattern. A common way to divide this large area is considering two parts i.e. Northern Zagros and Southern Zagros. Northern Zagros includes Iranian provinces of West Azerbayejan, Kurdestan, Hamedan, Kermanshahan, Ilam, Lorestan, Khuzestan, Chaharmahal va Bakhtiari. Southern Zagros covers provinces of Kohgiluye va Buyerahmad, Fars, Bushehr and Hormozgan. Another description considers three parts: northern, middle and southern Zagros.

Geologically, Zagros Mountains consist of two major parts alongside: Elevated Zagros and Folded Zagros. Elevated Zagros forms the north eastern mountains and Folded Zagros stands in the south and west of the Elevated Zagros. Heading east, Elevated Zagros faces Inner Highlands of the Zagros Mountains also known as Sanandej - Sirjan Zone. Folded Zagros instead ends in the Persian Gulf in south Khuzestan plain in south west and Mesopotamia in west.

Ecology[link]

The Zagros Mountains contain several ecosystems. Prominent among them are the forest and forest steppe areas with a semi-arid climate. As defined by the World Wildlife Fund and used in their Wildfinder, the particular terrestrial ecoregion of the mid to high mountain area is Zagros Mountains forest steppe (PA0446). The annual precipitation ranges from 400 mm to 800 mm (16 to 30 inches) and falls mostly in the winter spring. The winters are severe, with low temperatures often below −25°C (-13°F). The region exemplifies the continental variation of the Mediterranean climate pattern, with a snowy, cold winter and mild rainy spring followed by a dry summer and autumn^[5].

Although currently degraded through overgrazing and deforestation, the Zagros region is home to a rich and complex flora. Remnants of the originally widespread oak-dominated woodland can still be found, as can the park-like pistachio/almond steppelands. The ancestors of many familiar foods, including wheat, barley, lentil, almond, walnut, pistachio, apricot, plum, pomegranate and grape can be found growing wild throughout the mountains^[6]. The Zagros are home to many threatened or endangered organisms, including the Zagros Mountains Mouse-like Hamster (Calomyscus bailwardi), the Basra Reed-warbler (Acrocephalus griseldis) and the Striped hyena (Hyena hyena). The Persian fallow deer (Dama dama mesopotamica), an ancient domesticate once thought extinct, was rediscovered in the late 20th century in Khuzestan province in the southern Zagros.

History[link]

Signs of early agriculture date back as far as 9000 BC to the foothills of the Zagros Mountains,^[7] in cities later named Anshan and Susa. Jarmo is one archaeological site in this area. Shanidar, where the ancient skeletal remains of Neanderthals have been found, is another.

Some of the earliest evidence of production has been discovered in the Zagros Mountains; both the settlements of Hajji Firuz Tepe and Godin Tepe have given evidence of wine storage dating between 3500 and 5400 BC.^[8]

During early ancient times, the Zagros was the home of peoples such as the Kassites, Guti, Assyrians, Elamites and Mitanni, who periodically invaded the Sumerian and/or Akkadian cities of Mesopotamia. The mountains create a geographic barrier between the flatlands of Mesopotamia, which is in Iraq, and the Iranian plateau. A small archive of clay tablets detailing the complex interactions of these groups in the early second millennium BC has been found at Tell Shemshara along the Little Zab.^[9] Tell Bazmusian, near Shemshara, was occupied between the sixth millennium BCE and the ninth century CE, although not continuously.^[10]

Oshtoran Kooh Mountain

See also[link]

• Taurus Mountains
• Alborz Mountains

References[link]

External links[link]

Wikimedia Commons has media related to: Zagros Mountains

• Zagros, Photos from Iran, Livius.
• The genus Dionysia
• Iran, Timeline of Art History
• Mesopotamia 9000–500 B.C.
• Major Peaks of the Zagros Mountains

Coordinates: 33°40′N 47°00′E / 33.667°N 47°E / 33.667; 47

v t e Ancient Mesopotamia Geography Modern Euphrates Jezirah Mesopotamian Marshes Persian Gulf Syrian Desert Taurus Mountains Tigris Zagros Mountains Ancient Akkad Assyria Babylonia Chaldea Elam Hatti Media Mitanni Sumer Urartu Cities History Pre- and protohistory Acheulean Mousterian Zarzian Natufian PPNA PPNB Halaf Samarra Ubaid Uruk Jemdet Nasr History Early Dynastic Akkadian Ur III Old Babylonian Kassite Neo-Assyrian Neo-Babylonian Achaemenid Seleucid Parthian Roman Sassanid Muslim conquest Languages Akkadian Amorite Aramaic Eblaite Elamite Gutian Hittite Hurrian Iranian (Old Persian Parthian Middle Persian) Luwian Proto-Armenian Sumerian Urartian Culture and society Architecture Art Cuneiform Literature Akkadian Sumerian Music Religion Archaeology Iraq Museum Looting Tell Portal

v t e Iran topics History Pre-Islamic Prehistory Proto-Elamite civilization BCE 3200– BCE 2800 Elamite dynasties BCE 2800– BCE 550 Bactria-Margiana Complex BCE 2200– BCE 1700 Kingdom of Mannai BCE 10th– BCE 7th cent. Median Empire BCE 728– BCE 550 Achaemenid Empire BCE 550– BCE 330 Seleucid Empire BCE 330– BCE 150 Greco-Bactrian Kingdom BCE 250– BCE 125 Parthian Empire BCE 248–CE 224 Kushan Empire CE 30–CE 275 Sassanid Empire CE 224–CE 651 Hephthalite Empire CE 425–CE 557 Kabul Shahi kingdom CE 565–CE 879 Islamic Patriarchal Caliphate 637–651 Umayyad Caliphate 661–750 Abbasid Caliphate 750–1258 Tahirid dynasty 821–873 Alavid dynasty 864–928 Saffarid dynasty 861–1003 Samanid dynasty 819–999 Ziyarid dynasty 928–1043 Buyid dynasty 934–1055 Ghaznavid Empire 975–1187 Ghori dynasty 1149–1212 Seljuk Empire 1037–1194 Khwarezmid dynasty 1077–1231 Ilkhanate 1256–1335 Kartids dynasty 1231–1389 Ottoman Empire 1299–1923 Muzaffarid dynasty 1314–1393 Chupanid dynasty 1337–1357 Jalayerid dynasty 1339–1432 Timurid Empire 1370–1506 Qara Qoyunlu Turcomans 1375–1468 Aq Qoyunlu Turcomans 1378–1508 Safavid Empire 1501–1722 or 1736 Hotaki dynasty 1722–1729 Afsharid dynasty 1736–1750 Zand Dynasty 1750–1794 Durrani Empire 1794–1826 Qajar Dynasty 1794–1925 Modern Pahlavi dynasty 1925–1979 Interim Government of Iran 1979 Islamic Republic of Iran 1979–present See also Ancient Iran Iranian Cultural Continent Indo-Iranians (languages) Jiroft civilization Aryans Persian peoples Tajik people Iranian peoples Kings of Persia Military history Years in Iran Politics Government Intellectual movements Women's movement Elections Constitution Supreme Leader President Judicial system Assembly of Experts Parliament Guardian Council Expediency Discernment Council Supreme National Security Council City and Village Councils Human rights LGBT Officials Provincial governors Reformists Principlists United Nations Security Council Resolution 1747 Ambassadors Foreign relations Ministry of Intelligence Terrorism Military Army Air Force Navy Censorship Nuclear program Allegations of state terrorism Iranian Green Revolution Anglo-Iranian Oil Company Operation Ajax White Revolution Iranian Revolution Embassy siege Iran-Iraq war Iran Air Flight 655 1987 massacre of Iranian pilgrims Chicago's Persian heritage crisis History of the Islamic Republic of Iran Iranian Presidential Election, 2009 Persian Constitutional Revolution Propaganda Demographics Iranian citizens abroad Religion Muslims Bahá'ís Christians Azerbaijanis Armenians Persian Jews Ethnic minorities Religious minorities Zoroastrians persecution Women Languages Persian language Iranian Languages Azerbaijani Language Armenian Language Indo-Iranian languages Geography Cities list Iranian Azerbaijan Iranian Balochistan Iranian Kurdistan Iranian Plateau Islands Mountains Provinces Earthquakes Wildlife Economy Economic history of Iran Agriculture Fruit Industry Water and sanitation Health care Central bank Companies automobile manufacturers Banks Research centers Brain drain Iran Electronics Industries (IEI) Military equipment IDRO National Iranian Oil Company (NIOC) Iran Aviation Industries Organization (IAIO) Space Milad Tower and complex Military exports Rial Tehran Stock Exchange Electronic banking Intellectual property International Oil Bourse Bonyad Asalouyeh industrial corridor Kish Island Free Trade Zone Chabahar Free Trade-Industrial Zone Labor and tax laws Economic Cooperation Organization (ECO) Mining Construction Privatization Foreign Direct Investment Supreme Audit Court Communications Telecommunication Company of Iran (TCI) Transport Railways Metro Airlines Iran Shipping Lines Energy Petroleum industry Nuclear program Tourism Environmental issues Economic Reform Plan Middle East economy List of major economic laws in Iran Iran and WTO Economic history of Iran Society Culture Iranian nationality Iranology Education Higher Science Scientists and scholars Universities Philosophy List of Iranians Literature Media News agencies student newspapers Architecture architects Achaemenid architecture Art modern/contemporary Persian gardens Cinema Cuisine Public holidays National symbols Opium consumption Music Ey Iran Heavy metal Persian traditional music Folk Pop Rap and hip-hop Rock and alternative Blogs Mythology Folklore Islam Islamization Scouting Sport Football Other topics Calendar Persian New Year Crown jewels Anti-Iranianism Persian names Tehrangeles International rankings of Iran Sorood-e Shahanshahi Iran Portal

v t e  Iraq topics Society Iraqi people · Iraqi diaspora · Demographics · Minorities (Kurds · Assyrians · Turkmen · Mandaeans) · Languages (Arabic · Kurdish · Aramaic · Turkmen) · Religion (Islam · Christianity · Mandaeism) · Culture · Cuisine · Music · Education · Health · Sports History Ancient Iraq (Sumer · Akkadian Empire · Babylonia · Assyria · Neo-Assyrian Empire · Neo-Babylonian Empire · Achaemenid Assyria · Seleucid Babylonia · Parthian Babylonia · Sassanid Asuristan) · Islamic conquest of Iraq · Abbasid Caliphate · Ottoman Iraq · Mandatory Mesopotamia · Kingdom of Iraq · Arab Federation · Iraqi Republic (1958–1968) · Ba'athist Iraq · U.S. occupation · Republic of Iraq (2011-present) Arab Socialist Ba'ath Party · Saddam Hussein · Kurdish–Iraqi conflict · Iran–Iraq War · Invasion of Kuwait · Gulf War · Sanctions · Iraq War (Invasion · Iraqi insurgency) Economy Iraqi Dinar · Stock Exchange · Central Bank · Oil reserves · Media Infrastructure Communications · Transportation · Schools · Hospitals · Roads · Reconstruction Government Constitution · Legislative branch · Executive branch (President · Cabinet · Prime Minister) · Judiciary · Law · Police · Iraqi Armed Forces (Army · Air Force · Navy) Politics Political parties · Elections · Minority politics · Foreign relations · Human rights · Foreign aid · War conflicts Geography Mesopotamia · Tigris · Euphrates · Provinces · Districts · Notable Places · Syrian Desert · Zagros Mountains · Hamrin Mountains · Umm Qasr · Al-Faw Peninsula · Shatt al-Arab · Al-Jazira · Mesopotamian Marshes · Lake Habbaniyah · Lake Tharthar · Lake Hammar · Lake Milh · Islands