Discussion
Kuroko type Zn-Pb-Cu deposits are the examples of :
Answer: A
Kuroko deposits are volcanic hosted massive sulphide deposits.
The Kuroko ('black ore') deposits of Miocene age in Japan are the type example of volcanogenic massive sulphide (VMS) deposits rich in zinc, lead and copper. They formed on or just below the sea floor from hydrothermal fluids associated with felsic submarine volcanism, and so are found within volcanic sequences.
Skarns form where intrusions meet carbonate rocks, magmatic concentration deposits (such as chromite or nickel sulphide) segregate within mafic and ultramafic magma, and pegmatite deposits crystallise from residual granitic melts. None of these describes the Kuroko type.
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