Iranian plateau Persian plateau | |
---|---|
Location | Central Asia, South Asia, West Asia (including the South Caucasus) |
Part of | Afghanistan, Azerbaijan, Iran, Iraq (Iraqi Kurdistan), Pakistan (Khyber Pakhtunkhwa) (Baluchistan), [note 1] and Turkmenistan |
Geology | Eurasian Plate |
Area | |
• Total | 3,700,000 km2 (1,400,000 sq mi) |
Dimensions | |
• Length | 2,000 km (1,200 mi) |
Highest elevation | 7,492 m (24,580 ft) (Noshaq) |
The Iranian plateau [1] or Persian plateau [2] [3] is a geological feature spanning parts of the Caucasus, Central Asia, South Asia, and West Asia. It makes up part of the Eurasian Plate, and is wedged between the Arabian Plate and the Indian Plate. The plateau is situated between the Zagros Mountains to the west, the Caspian Sea and the Köpet Dag to the north, the Armenian Highlands and the Caucasus Mountains to the northwest, the Strait of Hormuz and the Persian Gulf to the south, and the Indian subcontinent to the southeast.
As a historical region, it includes Parthia, Media, Persis, and some of the previous territories of Greater Iran. [4] The Zagros form the plateau's western boundary, and its eastern slopes may also be included in the term. The Encyclopædia Britannica excludes "lowland Khuzestan" explicitly [5] and characterizes Elam as spanning "the region from the Mesopotamian plain to the Iranian Plateau". [6]
From the Caspian in the northwest to the Suleiman mountains in the southeast, the Iranian Plateau extends for close to 2,000 kilometres (1,200 mi). It encompasses a large part of Iran, all of Afghanistan, and the parts of Pakistan that are situated to the west of the Indus River, [note 2] covering an area of some 3,700,000 square kilometres (1,400,000 sq mi) In spite of being called a plateau, it is far from flat, and contains several mountain ranges; its highest point is Noshaq in the Hindu Kush at 7,492 metres (24,580 ft), and its lowest point is the Lut Desert to the east of Kerman, Iran, at below 300 metres (980 ft).
In geology, the plateau region of Iran primarily formed from the accretionary Gondwanan terranes between the Turan platform to the north and the Main Zagros Thrust; the suture zone between the northward moving Arabian plate and the Eurasian continent is the Iranian plateau. It is a geologically well-studied area because of general interest in continental collision zones, and because of Iran's long history of research in geology, particularly in economic geology.
The Iranian plateau in geology refers to a geographical area north of the great folded mountain belts resulting from the collision of the Arabian Plate with the Eurasian Plate. In this definition, the Iranian plateau does not cover southwestern Iran.
The plateau extends from East Azerbaijan Province in northwest of Iran (Persia) all the way to Afghanistan and Pakistan west of the Indus River. It also includes smaller parts of the Republic of Azerbaijan, Iraqi Kurdistan, and Turkmenistan.
The northwestern Iranian plateau, where the Pontic and Taurus Mountains converge, is rugged country with higher elevations, a more severe climate, and greater precipitation than are found on the Anatolian plateau. The region is known as the Anti-Taurus, and the average elevation of its peaks exceeds 3,000 m (9,800 ft). Mount Ararat, at 5,137 meters (16,854 ft) the highest point in Turkey, is located in the Anti-Taurus. Lake Van is situated in the mountains at an elevation of 1,546 meters (5,072 ft).
The headwaters of major rivers arise in the Anti-Taurus: the east-flowing Aras River flows into the Caspian Sea, and the south-flowing Euphrates and Tigris join in Iraq before flowing into the Persian Gulf. Several small streams that flow into the Black Sea or landlocked Lake Van also originate in these mountains. The Indus River begins in the highlands of Tibet and flows the length of Pakistan almost tracing the eastern edge of the Iranian plateau.
Southeast Anatolia lies south of the Anti-Taurus Mountains. It is a region of rolling hills and a broad plateau surface that extends into Syria. Elevations decrease gradually, from about 800 meters (2,600 ft) in the north to about 500 meters (1,600 ft) in the south. Traditionally, wheat and barley are the main crops of the region.
The plateau's mountain ranges can be divided into five major subregions: [7]
The Iranian plateau may have played a major role in the expansion of modern humans after the Out of Africa migration, serving as 'population hub' for 'Common Eurasians', where they subsequently diverged into 'Ancient East Eurasians' and 'Ancient West Eurasians' at c. 50,000 years ago, and from where they expanded in two waves during the Initial Upper Paleolithic (c. 45kya) and Upper Paleolithic (c. 38kya) periods respectively. Ancient and modern populations in the Iranian plateau have a similar genetic component to the Ancient West Eurasian lineage which stayed in the 'population hub' (WEC2), but also display some ancestry from Basal Eurasians and Ancient East Eurasians via contact events starting in the Paleolithic. [8]
In the Bronze Age, Elam stretched across the Zagros mountains, connecting Mesopotamia and the Iranian plateau. The kingdoms of Aratta, known from cuneiform sources, may have been located in the central Iranian plateau. In classical antiquity the region was known as Persia, due to the Persian Achaemenid dynasty originating in Fars. The Middle Persian Erān (whence Modern Persian Irān ) began to be used in reference to the state (rather than as an ethnic designator) from the Sassanid period (see Etymology of Iran).
Archaeological sites and cultures of the Iranian plateau include:
The plateau has historical oak and poplar forests. Oak forests are found around Shiraz. Aspen, elm, ash, willow, walnut, pine, and cypress are also found, though the latter two are rare. As of 1920, poplar was harvested for making doors. Elm was used for ploughs. Other trees like acacia, cypress, and Turkestan elm were used for decorative purposes. Flower wise, the plateau can grow lilac, jasmine, and roses. Hawthorn and Cercis siliquastrum are common, which are both used for basket weaving. [9]
The plateau is abundant with wildlife including leopards, bears, hyenas, wild boars, ibex, gazelles, and mouflons. These animals are mostly found in the wooded mountains of the plateau. The shores of the Caspian Sea and the Persian Gulf house aquatic birds such as seagulls, ducks, and geese. Deer, hedgehogs, foxes, and 22 species of rodents are found in semidesert, and palm squirrels and Asiatic black bears live in Baluchistan.
Wide variety of amphibians and reptiles such as toads, frogs, tortoises, lizards, salamanders, racers, rat snakes (Ptyas), cat snakes (Tarbophis fallax), and vipers live the Baluchistan region and along the slopes of the Elburz and Zagros mountains. 200 varieties of fish live in the Persian Gulf. Thirty species of the most important commercial fish Sturgeon is found in the Caspian Sea. [10] [11] [12]
The Iranian plateau harvests trees for making doors, ploughs, and baskets. Fruit is grown also. Pears, apples, apricots, quince, plums, nectarines, cherries, mulberries, and peaches were commonly seen in the 20th century. Almonds and pistachios are common in warmer areas. Dates, oranges, grapes, melon, and limes are also grown. Other edibles include potatoes and cauliflower, which were hard to grow until European settlement brought irrigation improvements. Other vegetables include cabbage, tomatoes, artichokes, cucumbers, spinach, radishes, lettuce, and eggplants. [9]
The plateau also produces wheat, barley, millet, beans, opium, cotton, lucerne, and tobacco. The barley is fed mainly to horses. Sesame is grown and made into sesame oil. Mushrooms and manna were also seen in the plateau area as of 1920. Caraway is grown in the Kerman Province. [9]
The Geography of Pakistan encompasses a wide variety of landscapes varying from plains to deserts, forests, and plateaus ranging from the coastal areas of the Indian Ocean in the south to the mountains of the Karakoram, Hindukush, Himalayas ranges in the north. Pakistan geologically overlaps both with the Indian and the Eurasian tectonic plates where its Sindh and Punjab provinces lie on the north-western corner of the Indian plate while Balochistan and most of Khyber Pakhtunkhwa lie within the Eurasian plate which mainly comprises the Iranian Plateau.
Geographically, the country of Iran is located in West Asia and the bodies of water the nation borders are the Caspian Sea, Persian Gulf, and Gulf of Oman. Topographically, it is predominantly located on the Iranian/Persian plateau, Its mountains have impacted both the political and the economic history of the country for several centuries. The mountains enclose several broad basins, on which major agricultural and urban settlements are located. Until the 20th century, when major highways and railroads were constructed through the mountains to connect the population centers, these basins tended to be relatively isolated from one another.
The Caucasus Mountains is a mountain range at the intersection of Asia and Europe. Stretching between the Black Sea and the Caspian Sea, they are surrounded by the Caucasus region and are home to Mount Elbrus, the highest peak in Europe at 5,642 metres (18,510 ft) above sea level.
The Sulaiman Mountains, also known as Kōh-e Sulaymān or Da Kasē Ghrūna, are a north–south extension of the southern Hindu Kush mountain system in Pakistan and Afghanistan. They are also known as Aparanchal Range, or Western Mountains ; as they mark the westernmost boundary of the Indian Subcontinent. They rise to form the eastern edge of the Iranian plateau. They are located in the Kandahar, Zabul and Paktia provinces of Afghanistan, and in Pakistan they extend over the northern part of Balochistan and Waziristan as well as Kurram of Khyber Pakhtunkhwa. In southwestern Punjab, the mountains extend into the two districts of Dera Ghazi Khan and Rajanpur, which are located west of the Indus River on the boundary with Balochistan. Bordering the mountains to the east are the plains of the Indus River valley, and to the north are the arid highlands of the Central Hindu Kush whose heights extend up to 3,383 metres (11,099 ft). The total area on which this range spans around 6475 sq. km. Together with the Kirthar Mountains on the border between Balochistan and Sindh, the Sulaiman Mountains form what is known as the Sulaiman-Kirthar geologic province.
The Zagros Mountains are a long mountain range in Iran, northern Iraq, and southeastern Turkey. The mountain range has a total length of 1,600 km. 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).
The Taurus Mountains are a mountain complex in southern Turkey, separating the Mediterranean coastal region from the central Anatolian Plateau. The system extends along a curve from Lake Eğirdir in the west to the upper reaches of the Euphrates and Tigris rivers in the east. It is a part of the Alpide belt in Eurasia.
Mount Damavand is a dormant stratovolcano and is the highest peak in Iran and Western Asia, the highest volcano in Asia, and the 3rd highest volcano in the Eastern Hemisphere, at an elevation of 5,609 metres (18,402 ft). Damāvand has a special place in Persian mythology and folklore. It is in the middle of the Alborz range, adjacent to Varārū, Sesang, Gol-e Zard, and Mīānrūd. It is near the southern coast of the Caspian Sea, in Amol City, Mazandaran State, 66 km (41 mi) northeast of the city of Tehran.
The Köpet Dag, Kopet Dagh, or Koppeh Dagh, also known as the Turkmen-Khorasan Mountain Range, is a mountain range on the border between Turkmenistan and Iran that extends about 650 kilometres (400 mi) along the border southeast of the Caspian Sea, stretching northwest-southeast from near the Caspian Sea in the northwest to the Harirud River in the southeast. In the southwest it borders on the parallel eastern endings of the Alborz mountains being together part of the much larger Alpide belt. The highest peak of the range in Turkmenistan is the Mount Rizeh, located at the southwest of the capital Ashgabat and stands at 2,940 metres (9,646 ft). The highest Iranian summit is Mount Quchan at 3,191 metres (10,469 ft).
The Zayanderud or Zayandehrud, also spelled as Zayanderud or Zayanderood, ..., is the largest river of the Iranian Plateau in central Iran.
Zard-Kuh is a sub-range in the central Zagros Range, Iran.
Tepe Sialk is a large ancient archeological site in a suburb of the city of Kashan, Isfahan Province, in central Iran, close to Fin Garden. The culture that inhabited this area has been linked to the Zayandeh River Culture.
Hazaran, is a massif of the Central Iranian Plateau, and an eastern outlier of the Zagros Mountains. Hazaran is located in Kerman Province, in southeast Iran. With an elevation of 4,500 metres, it is the highest peak in Kerman Province. The jebal Barez chain is a continuation to the south-east. The Halil River rises in the Bid Khan region. The massif is situated in the area encircled by the cities of Kerman, Bardsir, Sirjan, Baft, Jiroft and Bam.
Fereidoun Biglari is an Iranian archaeologist and a museum curator.
The topography of Pakistan is divided into seven geographic areas: the northern highlands, the Indus River plain, the desert areas, the Pothohar Plateau, Balochistan Plateau, Salt Range, and the Sistan Basin. All the rivers of Pakistan, i.e. Sindh, Ravi River, Chenab River, Jhelum River, and Sutlej River, originate from the Himalayas mountain range. Some geographers designate Plateau as to the west of the imaginary southwest line; and the Indus Plain lies to the east of that line.
The Alborz range, also spelled as Alburz, Elburz or Elborz, is a mountain range in northern Iran that stretches from the border of Azerbaijan along the western and entire southern coast of the Caspian Sea and finally runs northeast and merges into the smaller Aladagh Mountains and borders in the northeast on the parallel mountain ridge Kopet Dag in the northern parts of Khorasan. All these mountains are part of the much larger Alpide belt. The Alborz range is divided into the Western, Central, and Eastern Alborz Mountains. The Western Alborz Range runs south-southeastward almost along the western coast of the Caspian Sea. The Central Alborz runs from west to east along the entire southern coast of the Caspian Sea, while the Eastern Alborz Range runs in a northeasterly direction, toward the northern parts of the Khorasan region, southeast of the Caspian Sea. Mount Damavand, the highest mountain in Iran measuring 5,610.0 m, is located in the Central Alborz Mountains. Mount Damavand is the 12th most prominent peak in the world and the second most prominent in Asia after Mount Everest.
The prehistory of the Iranian plateau, and the wider region now known as Greater Iran, as part of the prehistory of the Near East is conventionally divided into the Paleolithic, Epipaleolithic, Neolithic, Chalcolithic, Bronze Age and Iron Age periods, spanning the time from the first settlement by archaic humans about a million years ago until the beginning of the historical record during the Neo-Assyrian Empire, in the 8th century BC.
The Zagros fold and thrust belt is an approximately 1,800-kilometre (1,100 mi) long zone of deformed crustal rocks, formed in the foreland of the collision between the Arabian Plate and the Eurasian Plate. It is host to one of the world's largest petroleum provinces, containing about 49% of the established hydrocarbon reserves in fold and thrust belts (FTBs) and about 7% of all reserves globally.
The Makran Trench is the physiographic expression of a subduction zone along the northeastern margin of the Gulf of Oman adjacent to the southwestern coast of Balochistan of Pakistan and the southeastern coast of Iran. In this region the oceanic crust of the Arabian plate is being subducted beneath the continental crust of the Eurasian plate.
The main points that are discussed in the geology of Iran include the study of the geological and structural units or zones; stratigraphy; magmatism and igneous rocks; ophiolite series and ultramafic rocks; and orogenic events in Iran.
The 1957 Alborz earthquake struck northern Iran's Mazandaran province at 04:12 local time on 2 July. It had a moment magnitude (Mw ) of 7.1 and occurred at a focal depth of 15 km (9.3 mi). The thrust-faulting shock was assigned a maximum Modified Mercalli intensity of IX (Violent). It devastated 120 villages in the Alborz Mountains and caused an estimated 1,500 fatalities. The earthquake also triggered landslides including one that dammed the Haraz River. Some damage was also reported in Tehran, Qaem Shahr and Sari. The total damage was estimated at US$25 million.