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3 - GEOMORPHOLOGY

from PART 1 - THE LAND

Published online by Cambridge University Press:  28 March 2008

K. Scharlau
Affiliation:
University of Marburg
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Summary

The variety and nature of morphological forms in the upland mass that forms Iran are closely determined by the prevailing climate. Just as this climate can be called an orographically conditioned variant of the general climatic type characteristic of the arid belt of the Old World, so the surface forms occurring within Iran can be characterized in an analogous manner. Climatic and geomorphological provinces can be said largely to coincide.

The massif of Iran rises generally within the Alpine orogenic zone of Eurasia. Together with its surrounding frame of mountain ranges, this massif separates the Saharan-Arabian portion of the arid zone of the northern hemisphere from its Turanian-Central Asian counterpart; and in addition, it divides the desert regions of the subtropics (deserts which have formed because of their location in relation to the tradewinds) from the dry areas of the temperate zone, which may be said to owe their aridity to an extreme continental position. The Iranian upland is subjected simultaneously to “westerly” weather conditions in the north and to effects of the monsoon in the south. The mountain ranges rise sharply from their foreland, which greatly facilitates condensation from the air masses associated with the Mediterranean, Caspian, and subtropical oceanic areas; but the resulting precipitation occurs consistently and in quantity only on the outer flanks to the west and north. The atmospheric circulation carries further moisture inland to the more sheltered highland zones, producing rainfall on the lee, or the inward-facing, slopes. This explains the extension of precipitation to the mountainous areas in the east and south of Iran.

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Publisher: Cambridge University Press
Print publication year: 1968

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  • GEOMORPHOLOGY
  • Edited by W. B. Fisher
  • Book: The Cambridge History of Iran
  • Online publication: 28 March 2008
  • Chapter DOI: https://doi.org/10.1017/CHOL9780521069359.004
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  • GEOMORPHOLOGY
  • Edited by W. B. Fisher
  • Book: The Cambridge History of Iran
  • Online publication: 28 March 2008
  • Chapter DOI: https://doi.org/10.1017/CHOL9780521069359.004
Available formats
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Save book to Google Drive

To save content items to your account, please confirm that you agree to abide by our usage policies. If this is the first time you use this feature, you will be asked to authorise Cambridge Core to connect with your account. Find out more about saving content to Google Drive.

  • GEOMORPHOLOGY
  • Edited by W. B. Fisher
  • Book: The Cambridge History of Iran
  • Online publication: 28 March 2008
  • Chapter DOI: https://doi.org/10.1017/CHOL9780521069359.004
Available formats
×