ANTHROPOSPHERE/SOCIETAL SYSTEM Flashcards
what is a resource
any material useful to society
type of resources
physical
biological
environmental
physical resources example
basics of industry/civilisation - e.g minerals
biological resources
- flora and fauna used
- as food, trees for timber used in construction and for fuel
environmental resources
landscape for ecological, aesthetic and recreational purposes
mineral resources
economic level of concentration of a mineral resource is known as a grade
2 types of economic minerals, ores/gangue
what is an ore
aggrege of minerals from which 1 or more minerlas can be extracted profitably
what is gangue
unwanted, non-profitable minerals
origin of mineral resources
hydrothermal mineral deposits
magmatic mineral deposits
sedimentary mineral deposits
placer deposits
residual mineral deposits
hydrothermal mineral deposits
x
magmatic mineral deposits
olivine, chromite and feldspar settle one after the other to the bottom of a magma chamber, producing three types of rocks who comp differ considerably from that of the parent magma
sedimentary mineral deposits
commonly formed by evaporation of lake water or seawater, leading to formation of evaporite deposits
evaporites derived from lake water include sodium carbonate, sodium sulphate and borax
evaporites derived from lake water include gypsum, halite and carnallite
placer deposits
most important mineral concentration in placers are gold, platinum, cassiterite, rutile, zircon and diamond
residual mineral deposits
produced when rocks experience chemical weatherin due to rainwater
most soluble materials are removed leavin less soluble minerals as a residual mineral deposit
2 most important ore mineral found in residual deposots are limonite and gibbsite which from laterites and lateritic bauxites
