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Qal'eh Hasan Ali volcanic field, Iran

Qal'eh Hasan Ali volcanic field, Iran, Volcano photo


Qal'eh Hasan Ali volcanic field, Iran

The circular crater near the center of this NASA Landsat image (with north to the top) is the largest maar of the Qal'eh Hasan Ali volcanic field in SE Iran.

This maar, known as "Great Crater, " is 1.2 km wide and 200-300 m deep.

It is one of 14 maars of late Quaternary age erupted through desert alluvium, granodioritic rocks, and Eocene volcanics in an area several hundred km away from the closest Quaternary volcanoes.

The Qal'eh Hasan Ali volcanic field in SE Iran contains 14 maars of late Quaternary age.

The maars were erupted through desert alluvium, granodioritic rocks, and Eocene volcanics in an area several hundred km away from the closest Quaternary volcanoes.

The maars produced tephritic pyroclastic deposits.

The diameters of the maars range from 150 to 1200 m; the largest, known as Great Crater, is 1.2 km wide and 200-300 m deep.

The ages of the maars have been roughly estimated by degree of erosion as 5000-50,000 years (Milton, 1976-77).

PHOTO SOURCE: NASA Landsat7 image (worldwind.arc.nasa.gov)



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