What is Geochemistry?

It can generally be defined as the science of learning:
abundance / content elements and isotopes in the various components making up the earth distribution and migration of elements in the geological cycle
the principles governing the distribution and migration of elements throughout the geologic cycle
Exploration / prospecting geochemistry:
more emphasis on measuring the abundance, distribution, and migration of ore elements or elements directly related to ore, in order to track keterdapatan an ore deposition.
Geochemical exploration in a more narrow sense
prospecting, geochemical exploration is a technique through one or more systematic measurement of trace elements in rocks, soil, sediment, vegetation, water, or gas, to obtain geochemical anomaly, namely abnormal concentrations of certain elements that contrast against the environment (geochemical background)
with the aim of:
found concentrations of metal (ore deposits) that can be mined ..
Distribution of Elements in the Earth's Crust
The elements of a common base metal: copper, zinc, and nickel are relatively rare, each only about 100 ppm, while the team just eight constituent elements of the earth's crust that have more abundance> 1%, namely:
  oxygen and silicon to form nearly 75% of the earth's crust,
aluminum, iron, calcium, sodium, potassium and magnesium are next in line, where the aluminum is about 8%,
  2% magnesium.
bal 15 ppm.
  White lead is only 3 ppm, 1 ppm tungsten and gold are very rare, which is about 0.005 ppm.