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(meteorobs) Iridium from Impacts vs Volcanism




Both asteroid impacts on earth and Volcanoes give off Iridium I understand. 
Is there anything different about the Iridium from both sources that would 
enable one to say that it definitely came from an asteroid or a volcanoe? 

Also I understand that the iridium content from an asteroid is suppose to be 
larger than that from a volcanoe....but how could you tell if iridium came 
from a small-medium sized asteroid impact and not from an extensive volcanic 
eruption?
GeoZay
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