Lec 3 - Minerals, metallogeny, Plate Tectonics Flashcards
Ore deposit formation in time and space
- science of the origin and distribution of ore deposits
Metallogeny
Distinct metal source reservoir with repeated mobilization
Metallogenic heredity
Synthesis of available info on the deposit type, including the ost informative and reliable characteristics recognized on a variety of scales
Ore Deposit Model
Mineral deposits form by natural earth processes:
At depth - from internal heat and pressure
Near the usrfcae - from rock interactions with atmosphere and hydrosphere
It forms conduits and zones of high heat flow, generating thermal fluids which transports metal complexes
Volcano-magmatic activities
Precious and semi-precious metals are mobilized by fluids associated with ___________ and _____________
magmatism and subsequent volcanism
in divergent plate boundaries _________ Are found akl along the mid-oceanic ridges
Hydrothermal vents
What deposits are mineralized at convergent plate boundaries
Igneous ore deposits and hydrothermal ore deposits
Cooling of magma produces mineral grains, after crystallization, crystal settling can reuslt in concentration of minerals
Magmatic Ore Deposits
When a solution flow rapidly in an open fracture, or through a mass of shattered rocks, rapid precipitation results in a concentrated mineral deposit
Hydrothermal Ore deposit
Syn-tectonic quartz-carbonate veins, forms at
Mid-crustal levels
Typically created by chemical depositon
Sedimentary ore deposits
Areas with stable or little tectonic activity typically form sedimentary deposits. Mostly limestones and evaporites
Continental basin/margin
At type of sed ore deposit which is also the largest source of iron in the world
Banded Iron Formations
Formed by streams and weathering (leaching)
Weathering ore deposits
