What is supergene and hypogene?
Supergene is a term used to describe near-surface processes and their products, formed at low temperature and pressure by the activity of descending water and gas. The opposite term is hypogene, formed by ascending water and gas at high temperature and pressure.
What is skarn deposit?
Skarn deposits are one of the more abundant ore types in the earth’s crust and form in rocks of almost all ages. Skarn is a relatively simple rock type defined by a mineralogy usually dominated by calcsilicate minerals such as garnet and pyroxene.
What are magmatic ore deposits?
Magmatic ore deposits are derived from accumulations of crystals of metallic oxides, or immiscible sulfide, or oxide liquids that formed during the cooling and crystallization of magma, typically with mafic to ultramafic compositions.
What are supergene enrichment deposits?
supergene sulfide enrichment, also called Secondary Enrichment, in geology, natural upgrading of buried sulfide deposits by the secondary or subsequent deposition of metals that are dissolved as sulfates in waters percolating through the oxidized mineral zone near the surface.
What does skarn look like?
Skarns or tactites are hard, coarse-grained metamorphic rocks that form by a process called metasomatism. Skarns tend to be rich in calcium-magnesium-iron-manganese-aluminium silicate minerals, which are also referred to as calc-silicate minerals.
How do you identify skarn?
- Skarn is coarse-grained metamorphic rocks that forms by a metasomatism.
- Name origin: Skarn names came from old Swedish mining term is silicate gangue, or waste rock, associated with iron-ore bearing sulfide deposits.
- Colour: Black, Brown, Colourless, Green, Grey, White.
- Grain size: fine or course grains rock.
What are the two types of magmatic deposits?
There are two main types of chromite deposits:
- Stratiform and.
- Podiform.
How do residual mineral deposits form?
A residual deposit is a deposit formed by the alteration of a pre-existing rock of which a large part of its constituents have been lost by dissolution and which has therefore become enriched in certain minerals or other elements.
Which of the following is a residual deposit?
The residual deposits are the insoluble products of rock weathering which have escaped distribution by transporting agencies, and which still mantle the rocks from which they have been derived.