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24 Cards in this Set
- Front
- Back
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What is hydrothermal fluid?
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Aqueous fluid containing dissolved metals in solution
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When does a mineral vein form?
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Minerals precipitate in a fracture
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What is a country rock?
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Older rock surrounding igneous intrusion
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What is precipitation
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Minerals come out of solution
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What are the 3 requirements for hydrothermal fluid formation?
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Water
Heat Metals |
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What are the 3 sources of heat for hydrothermal processes?
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Magma
Geothermal gradient Metamorphism |
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What are the 2 sources of metals for hydrothermal ore deposits?
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Magma
Leached from rocks |
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What 4 sources of are there for hydrothermal fluid?
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Magma
Groundwater Metamorphism Sea water |
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What are hydrothermal veins associated with?
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Silicic intrusions
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When do hydrothermal processes take place?
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Late in cooling history
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What is galena?
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Lead
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What is Sphalerite?
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Zinc
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What is Cassiterite?
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Tin
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Where do the least soluble minerals precipitate?
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Close to the intrusion
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Where does cassiterite form?
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Close to the intrusion
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Where does Galena and Sphalerite form?
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Further away from the intrusion
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As the country cools it contracts forming what?
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Tension jointing
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What can move into tension joints surrounding a silicic intrusion?
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Hydrothermal fluid
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What happens if migrating hydrothermal fluid encounters limestone?
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Gangue minerals are formed
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Mineral veins form what type of pattern?
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Symmetrical
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Where does disseminated ore form?
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Pore spaces of rocks
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What type of zones form around silicic intrusions?
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Concentric zones
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What temperature does Cassiterite form?
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400
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What temperature does Galena and Sphalerite form?
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250
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