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Kathy Case
Geography
24 September, 13:10
1) Define BIF?
2) Define VMS. Also define its type
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Shiner
24 September, 13:17
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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.
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