Ore Formation Flashcards by Emile Jayne

Q

From hydrothermal fluids:

Water at high temps and pressure scavenges metal ions from the

A

Magma and from the metals in the surrounding rocks as it comes into contact with them.

This causes alteration.

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Q

By separation of magma:

Minerals with high melting temps

A

(olivine/pyroxene) crystallise early from magma.

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Q

By separation of magma:

Sometimes accompanied by dense, non-silicate minerals, containing

A

Iron chromium and titanium, which sink to the bottom of the magma chamber and form layers of ore when magma solidifies.

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Q

From hydrothermal fluids:

The hot, aqueous, hydrothermal fluid approaches

A

Earths surface and cools, infiltrating cracks in colder surrounding rocks.

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