1) Define BIF?

2) Define VMS. Also define its type

Banded iron formation (BIF) -

It is aslo called the banded inronstone formations, are the part of the distinctive units in the sedimentary rocks, which are always of the precambrian age.

volcanogenic massive sulfides (VMS) -

A type of metal sulfide ore deposit, which have copper - zinc as the main elements, they are formed by in the submarine environments by the volcanic - associated hydrothermal events.

The types of VMS -

Mafic associated - The type of deposits associated with geological environments by mafic rocks.

Bimodal-mafic - The type deposits associated with environments dominated by mafic volcanic rocks.

Mafic-siliciclastic - The type deposits associated with sub - equal proportions of the siliciclastic and the mafia rocks.

Felsic-siliciclastic - The type deposits associated with less than 10 % mafic rock and rest siliciclastic sedimentary rock.

Bimodal-felsic The type deposits associated with more of felsic rocks than mafic rocks.