Discussion
Which of the following processes is responsible for the incorporation of sulphides in the komatiite magmas ?
Answer: B
Sulphides enter komatiite magmas mainly by Assimilation of crustal material.
Komatiites form by very high degrees of mantle melting and leave the mantle undersaturated in sulphur. To form the nickel sulphide ores of Kambalda in Western Australia or the Thompson belt in Canada, the hot, fluid lava had to melt and assimilate sulphur-rich sediments in its floor (thermal erosion), which saturated the magma in sulphide.
Higher partial melting is what makes komatiites sulphur-undersaturated in the first place, very low melting would not produce komatiite at all, and extreme fractionation is uncharacteristic of these rapidly erupted lavas.
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