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Zagros Mountains

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The Zagros Mountains[a] are a long mountain range in Iran, northern Iraq, and southeastern Turkey. The mountain range has a total length of 1,600 km (990 miles). The Zagros range begins in northwestern Iran and roughly follows Iran's western border while covering much of southeastern Turkey and northeastern Iraq. From this border region, the range continues southeast to the waters of the Persian Gulf. It spans the southern parts of the Armenian highlands, and the whole length of the western and southwestern Iranian plateau, ending at the Strait of Hormuz. The highest point is Mount Dena, at 4,409 metres (14,465 ft).

Zagros
Highest point
PeakQash-Mastan (Dena)
Elevation4,409 m (14,465 ft)
Coordinates30°57′N 51°26′E / 30.950°N 51.433°E / 30.950; 51.433
Dimensions
Length1,600 km (990 mi)[1]
Width240 km (150 mi)[1]
Geography
Map
LocationIran, Iraq, and Turkey
Middle East or Western Asia
Range coordinates33°40′N 47°00′E / 33.667°N 47.000°E / 33.667; 47.000
Geology
Age of rockCarboniferous
Mountain typeFold and thrust belt

Geology

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See also: Geology of Iran
 
SRTM shaded relief anaglyph of Zagros Mountains
 
The Zagros Mountains from space, September 1992[4]

The Zagros fold and thrust belt was mainly formed by the collision of two tectonic plates, the Eurasian Plate and the Arabian Plate.[5] This collision mainly happened during the Miocene (about 25–5 mya or million years ago) and folded the entirety of the rocks that had been deposited from the Paleozoic (541–242 mya) to the Cenozoic (66 mya – present) in the passive continental margin on the Arabian Plate. However, the obduction of Neotethys oceanic crust during the Cretaceous (145–66 mya), and the continental arc collision in the Eocene (56–34 mya) both had major effects on uplifts in the northeastern parts of the belt.

The process of collision continues to the present, and as the Arabian Plate is being pushed against the Eurasian Plate, the Zagros Mountains and the Iranian plateau are getting higher and higher. Recent GPS measurements in Iran[6] 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 Iranian Zagros[7] also proves a high rate of deformation within the Zagros. The GPS results show that the current rate of shortening in the southeast Zagros is ~10 mm/a (0.39 in/year), dropping to ~5 mm/a (0.20 in/year) in the northwest Zagros. The north–south Kazerun strike-slip fault divides the Zagros into two distinct zones of deformation. The GPS results also show different shortening directions along the belt, normal shortening in the southeast, and oblique shortening in the northwest Zagros. The Zagros mountains were created around the time of the second ice age,[8] which caused the tectonic collision, leading to its uniqueness.

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.[9] This different basal friction is partly responsible for the different topographies on either side of the Kazerun fault. Higher topography and narrower zone of deformation in the NW Zagros is observed whereas in the SE, deformation was spread more and a wider zone of deformation with lower topography was formed.[10] 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 area for oil production. Salt domes and salt glaciers are a common feature of the Zagros Mountains. Salt domes are an important target for petroleum exploration, as the impermeable salt frequently traps petroleum beneath other rock layers. There is also much water-soluble gypsum in the region.[11]

Type and age of rock

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Glaciers on Dena

The mountains are completely of sedimentary origin and are made primarily of limestone. In the Elevated Zagros or the Higher Zagros, the Paleozoic rocks can be found mainly in the upper and higher sections of the peaks of the Zagros Mountains, along the Zagros main fault. On both sides of this fault, there are Mesozoic rocks, a combination of Triassic (252–201 mya) and Jurassic (201–145 mya) rocks that are surrounded by Cretaceous rocks on both sides. The Folded Zagros (the mountains south of the Elevated Zagros and almost parallel to the main Zagros fault) is formed mainly of Tertiary rocks, with the Paleogene (66–23 mya) rocks south of the Cretaceous rocks and then the Neogene (23–2.6 mya) rocks south of the Paleogene rocks. The mountains are divided into many parallel sub-ranges (up to 10 or 250 km (6.2 or 155.3 miles) wide), and orogenically have the same age as the Alps.[12]

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 4,000 metres (13,000 feet). They contain some limestone rocks showing abundant marine fossils.[10]

Highest peaks

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The peaks that are at least 3800 meters high and have a topographic prominence of at least 300 meters:

Name Sub-range Height (m) Prominence (m)
1 Qash-Mastan Dena 4409 2604
2 Kale Qodveis Dena 4341 424
3 Pazane Pir Dena 4250 1080
4 Kuh-e Dama Dena 4216 504
5 Kolonchin Zard-Kuh 4221 2095
6 Chegaleh Zard-Kuh 4134 594
7 Haft Tanan Zard-Kuh 4104 653
8 San-Borān Oshtorankuh 4150 1928
9 Qalikuh 4078 1420
10 Shahankuh 4038 1427
11 Qanbarkosh 3982 316
12 Haft Cheshmeh 3975 1545
13 Cheshmeh Kuhrang 3969 360
14 Karpush 3961 915
15 Bel 3943 1563
16 Khurbeh 3902 915
17 Darab Shah 3900 1495
18 Piaro Kamandan 3891 370
19 Hezar Darreh 3890 1628
20 Kuh-e Hashtad 3869 1248
21 Chahardah Pahlu 3845 949
22 Dome Qalikuh 3839 602
23 Kule Jonou 3823 422

History

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See also: Durupınar site
 
Ancient cobblestoned pathway in Zagros, Behbahan
 
A ceramic ware excavated in Zagros, Dalma Tepe

The Zagros Mountains have significant ancient history. They were occupied by early humans since the Lower Paleolithic Period. The earliest human fossils discovered in Zagros belongs to Neanderthals and come from Shanidar Cave, Bisitun Cave, and Wezmeh Cave. The remains of ten Neanderthals, dating from around 65,000–35,000 years ago, have been found in the Shanidar Cave.[13] The cave also contains two later "proto-Neolithic" cemeteries, one of which dates back about 10,600 years and contains 35 individuals.[14] Evidence from later Upper Paleolithic and Epipaleolithic occupations come from Yafteh Cave, Kaldar Cave near Khoramabad, and Warwasi, Malaverd near Kermanshah, Kenacheh Cave in Kurdistan, Boof Cave in Fars and a number of other caves and rock shelters.[15] Signs of early agriculture date back as far as 9000 BC in the foothills of the mountains.[16] Some settlements later grew into cities, eventually named Anshan and Susa; Jarmo is one archaeological site in this area. Some of the earliest evidence of wine production has been discovered in the mountains; both the settlements of Hajji Firuz Tepe and Godin Tepe have given evidence of wine storage dating between 3500 and 5400 BC.[17]

A human metatarsal bone fragment from Wezmeh Cave has been analyzed and dated to the Neolithic period. The DNA from this bone fragment shows that it is from a distinct genetic group, which was not known to scientists before. He belongs to the Y-DNA haplogroup G2b,[18] specifically its branch G-Y37100,[19] and mitochondrial haplogroup J1d6. He had brown eyes, relatively dark skin, and black hair, although Neolithic Iranians carried reduced pigmentation-associated alleles in several genes and derived alleles at 7 of the 12 loci, showing the strongest signatures of selection in ancient Eurasians. He did not contribute to the genetic makeup of early European farmers or modern Europeans. Instead, he was the most genetically similar to modern Iranian Zoroastrians, followed by Fars, Balochi, Brahui, Kalash and Georgians.[20] Gallego-Llorente et al. (2016) believes that the Zagros Mountain was a plausible source of Eurasian ancestry in Central and South Asia, along with Kotias, which was inhabited by Caucasu Hunter-Gatherers. He cites archaeological evidence of eastward Neolithic expansions from the Near East.[21]

During early ancient times, the Zagros was the home of peoples such as the Hurrians, Guti, Kassites, Elamites and Mitanni, who periodically invaded the Sumerian and/or Akkadian cities of Mesopotamia. The mountains create a geographic barrier between the Mesopotamian Plain, 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.[22] Tell Bazmusian, near Shemshara, was occupied between 5000 BCE and 800 CE, although not continuously.[23]

Population

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The Zagros mountains have been inhabited by different groups of pastoralists and farmers for thousands of years. Pastoralist groups such as Lurs, Bakhtiari Lurs, Kurds or Qashqais move from their herds from the east slopes in summer (Yeylāgh) to the west slopes in winter (Gheshlāgh). Some major cities are located on the foothills of the Zagros mountains, including Sulaymaniyah, Kermanshah, Khorramabad, and Shiraz.

Lurs

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The Lurs are an Iranic tribe, primarily inhabiting the Central, Western, and Southern Zagros. Cities inhibited by Lurs include Khorramabad, Borujerd, Malayer, Izeh, Shahr-e Kord, Yasuj. Lurs speak Luri and span across many provinces in Iran including Lorestan, Khuzestan, Chaharmahal and Bakthiari, Ilam, Kohgiluyeh and Boyer-Ahmad, and Hamedan.

Bakhtiari Lurs

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The Bakhtiaris are a Lur tribe from Iran, primarily inhabiting the Central and South Zagros. Major cities inhabited by Bakhtiaris include Masjed Soleyman, Izeh and Shahr-e Kord. A significant number of Bakhtiari still practice nomadic pastoralism.

Kurds

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A Kurdish girl in the eastern Zagros village of Palangan celebrating Newroz

Kurds are aborigines from the northwestern and the eastern Zagros Taurus mountain ranges, which spans southeastern Turkey, northwestern Iran, northern Iraq, and northern Syria. The high altitude of the Zagros mountains produces a series of choke points and valleys perfect for agriculture and human development.[24] It has also long defended the Kurds in times of war by acting as a natural barrier.[25]

Qashqai

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Qashqai people are a tribal confederation in Iran mostly of Turkic origin. Significant populations can be found in Central and South Zagros, especially around the city of Shiraz in the Fars province.

Climate

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The 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 400–800 mm (16–31 in) and falls mostly in winter and spring. 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 winter and mild, rainy spring, followed by a dry summer and autumn.[26]

Climate data for Amadiya District, Iraq
Month Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec Year
Mean daily maximum °C (°F) −0.2
(31.6) 		1.4
(34.5) 		6.4
(43.5) 		12.2
(54.0) 		19.3
(66.7) 		24.8
(76.6) 		29.7
(85.5) 		29.6
(85.3) 		25.6
(78.1) 		17.7
(63.9) 		9.7
(49.5) 		2.7
(36.9) 		14.9
(58.8)
Mean daily minimum °C (°F) −8.0
(17.6) 		−6.8
(19.8) 		−2.0
(28.4) 		3.5
(38.3) 		8.8
(47.8) 		13.0
(55.4) 		17.3
(63.1) 		16.9
(62.4) 		13.0
(55.4) 		7.2
(45.0) 		2.1
(35.8) 		−4.3
(24.3) 		5.1
(41.1)
Source: [27]

Glaciation

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The mountains of the East-Zagros, the Kuh-i-Jupar (4,135 m (13,566 ft)), Kuh-i-Lalezar (4,374 m (14,350 ft)) and Kuh-i-Hezar (4,469 m (14,662 ft)) do not currently have glaciers. Only at Zard Kuh and Dena some glaciers still survive. However, before the Last Glacial Period they had been glaciated to a depth in excess of 1,900 metres (1.2 miles), and during the Last Glacial Period to a depth in excess of 2,160 metres (7,090 feet). Evidence exists of a 20 km (12 miles) wide glacier fed along a 17 km (11 miles) long valley dropping approximately 1,600 m (5,200 ft) along its length on the north side of Kuh-i-Jupar with a thickness of 350–550 m (1,150–1,800 ft). Under conditions of precipitation comparable to current climatic record-keeping, this size of glacier could be expected to form where the annual average temperature was between 10.5 and 11.2 °C (50.9 and 52.2 °F), but since conditions are expected to have been dryer during the period in which this glacier was formed, the temperature must have been lower.[28][29][30][31]

Flora and fauna

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Main article: Zagros Mountains forest steppe
 
A view of Quercus brantii forests that dominate the Zagros Mountains
 
Men with a restrained lion in Iran. This photograph was taken by Antoin Sevruguin, c. 1880,[32] before the lion's extirpation in the country.

Flora

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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.[33] Quercus brantii (covering more than 50% of the Zagros forest area) is the most important tree species of the Zagros in Iran.[34]

Other floral endemics found within the mountain range include: Allium iranicum, Astragalus crenophila, Bellevalia kurdistanica, Cousinia carduchorum, Cousinia odontolepis, Echinops rectangularis, Erysimum boissieri, Iris barnumiae, Ornithogalum iraqense, Scrophularia atroglandulosa, Scorzonera kurdistanica, Tragopogon rechingeri, and Tulipa kurdica.[35]

Fauna

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The Zagros are home to many threatened and endangered species, 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. Also, wild goats can be found almost all over the Zagros mountain range. In the late 19th century, the Asiatic lion (Panthera leo persica)[36] inhabited the southwestern part of the mountains. It is now extinct in this region.[37]

The Luristan newt (Neurergus kaiseri) is a salamander endemic to a small section of the central Zagros Mountains in Iran. It lives in highland streams and is primarily aquatic. This newt is considered vulnerable to extinction due to poaching for the pet trade and habitat destruction. Climate change is predicted to strongly impact this species. [38]

Religion

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The entrance to the ancient Mesopotamian underworld was believed to be located in the Zagros Mountains in the far east.[39] A staircase led down to the gates of the underworld.[39] The underworld itself is usually located even deeper below ground than the Abzu, the body of freshwater which the ancient Mesopotamians believed lay deep beneath the earth.[39]

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See also

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Parts of the Zagros Mountains

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Other

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Notes

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  1. ^ Persian: کوه‌های زاگرس, romanized: Kuh hā-ye Zāgros; Arabic: جبال زاغروس, romanized: Jibal Zaghrus; Kurdish: چیاکانی زاگرۆس, romanized: Çiyakanî Zagros;[2][3] Turkish: Zagros Dağları; Luri: Kûya Zagrus چغائیا زاگرس or کوه یل زاگرس

References

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  1. ^ a b "Zagros Mountains". Encyclopedia Britannica. Retrieved 17 August 2017.
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  3. ^ "چەند دیمەنێکی زنجیرە چیاکانی زاگرۆس". Basnews (in Kurdish). Retrieved 18 December 2019.
  4. ^ "Salt Dome in the Zagros Mountains, Iran". NASA Earth Observatory. Archived from the original on 1 October 2006. Retrieved 27 April 2006.
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  38. ^ IUCN (22 July 2016). Neurergus kaiseri: IUCN SSC Amphibian Specialist Group: The IUCN Red List of Threatened Species 2016: e.T59450A49436271 (Report). International Union for Conservation of Nature. doi:10.2305/iucn.uk.2016-3.rlts.t59450a49436271.en. Retrieved 30 November 2023.
  39. ^ a b c Black, Jeremy; Green, Anthony (1992), Gods, Demons and Symbols of Ancient Mesopotamia: An Illustrated Dictionary, Austin, Texas: University of Texas Press, p. 180, ISBN 0714117056
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