I want to know more about diamond ore deposits in world.
Dear Gholamreza: diamonds are typically associated with deep sited alkali-ultramafic rocks, such as kimberlite, alnoites, orangeites, etc. These rocks only occur in continental environments, where there is a deep and ancient (Archean) crustal and lithospheric root, cool enough to obey the so called Clifford Rule, where at 120-140 km depth the temperature is below 1.000°C. Other volcanic rocks of deep origin can occur in Precambrian to Paleozoic massifs, but if they don't obey the Rule, they will be barren intrusions or extrusions. So, you must find out how deep is the moho or the L/A boundary in Eastern Iran and Western Afghanistan: the deeper the moho, the deeper could be the lithospheric root below, and the highest the chance to have fertile kimberlite or alnoite bodies. Regards, Sebastian.
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