Question:
Which of the following deposits is/are linked to magmatic-hydrothermal fluids derived from granitic plutons?
Which of the following deposits is/are linked to magmatic-hydrothermal fluids derived from granitic plutons?
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Think about which deposit type forms directly from late-stage fluids released by a crystallizing granite, not from mafic or ultramafic magma or basinal brines.
Updated On: Jul 20, 2026
- Mississippi Valley-type (MVT) Pb-Zn deposit
- Ophiolite-hosted chromite deposit
- Komatiite-hosted Ni-Cu sulfide deposit
- Greisen related Sn-W deposit
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The Correct Option is D
Solution and Explanation
Step 1: Understand what the question is asking.
We need to find which of the four ore deposit types forms from magmatic-hydrothermal fluids that come out of a granitic pluton as it cools. These fluids are late-stage, water and volatile rich fluids left over after most of the granite has crystallized.
Step 2: Check option (A), MVT Pb-Zn deposit.
Mississippi Valley-type deposits form when warm basinal brines move through carbonate rocks far from any igneous body. They are not linked to a granitic pluton at all, so this option is wrong.
Step 3: Check option (B), ophiolite-hosted chromite.
Chromite in ophiolites forms by crystal settling inside mafic and ultramafic magma chambers at spreading ridges. The source magma is basaltic to picritic, not granitic, so this option is wrong.
Step 4: Check option (C), komatiite-hosted Ni-Cu sulfide.
Komatiite is an ultramafic volcanic rock. Ni-Cu sulfides collect by liquid immiscibility inside komatiitic lava flows and conduits. Again the parent magma is ultramafic, not granitic, so this option is wrong.
Step 5: Check option (D), greisen related Sn-W deposit.
Greisen deposits form right at the top and margins of granitic plutons. As the granite crystallizes, water, fluorine and boron rich fluids are pushed out. These fluids alter the granite and nearby rock into greisen, a quartz-mica rock, and deposit tin and tungsten minerals such as cassiterite and wolframite. This is the classic magmatic-hydrothermal deposit tied directly to granite plutons, so this option is correct.
Step 6: Final conclusion.
Only the greisen related Sn-W deposit is linked to magmatic-hydrothermal fluids from granitic plutons.
\[ \boxed{\text{Only (D) is correct}} \]
We need to find which of the four ore deposit types forms from magmatic-hydrothermal fluids that come out of a granitic pluton as it cools. These fluids are late-stage, water and volatile rich fluids left over after most of the granite has crystallized.
Step 2: Check option (A), MVT Pb-Zn deposit.
Mississippi Valley-type deposits form when warm basinal brines move through carbonate rocks far from any igneous body. They are not linked to a granitic pluton at all, so this option is wrong.
Step 3: Check option (B), ophiolite-hosted chromite.
Chromite in ophiolites forms by crystal settling inside mafic and ultramafic magma chambers at spreading ridges. The source magma is basaltic to picritic, not granitic, so this option is wrong.
Step 4: Check option (C), komatiite-hosted Ni-Cu sulfide.
Komatiite is an ultramafic volcanic rock. Ni-Cu sulfides collect by liquid immiscibility inside komatiitic lava flows and conduits. Again the parent magma is ultramafic, not granitic, so this option is wrong.
Step 5: Check option (D), greisen related Sn-W deposit.
Greisen deposits form right at the top and margins of granitic plutons. As the granite crystallizes, water, fluorine and boron rich fluids are pushed out. These fluids alter the granite and nearby rock into greisen, a quartz-mica rock, and deposit tin and tungsten minerals such as cassiterite and wolframite. This is the classic magmatic-hydrothermal deposit tied directly to granite plutons, so this option is correct.
Step 6: Final conclusion.
Only the greisen related Sn-W deposit is linked to magmatic-hydrothermal fluids from granitic plutons.
\[ \boxed{\text{Only (D) is correct}} \]
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