20: Geological Resources (Exercises)

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Page ID: 2060

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Q20.1 Where does it come from?

Responses will vary

Q20.2 The importance of heat and heat engines

Deposit Type	Is Heat a Factor?	If So, What Is the Role of the Heat?
Magmatic	Yes	Heat is necessary for melting of the rock to produce magma
Volcanogenic massive sulphide	Yes	Heat is necessary for melting of the rock to produce magma
Porphyry	Yes	Heat contained within the porphyritic intrusion drives the convection system
Banded iron formation	No	Iron is deposited from cold ocean water
Unconformity-type uranium	Probably	Uranium solubility is enhanced at higher water temperatures

Q20.3 Sources of important lighter metals

Element	Silicon	Calcium	Sodium	Potassium	Magnesium
Source(s)	quartz sand	lime-stone	halite (NaCl)	sylvite (KCl)	dolomite ((Ca,Mg)CO₃), magnesite (MgCO₃), salt lakes and the ocean

Q20.4 Interpreting a seismic profile

[SE after USGS at: http://walrus.wr.usgs.gov/infobank/p...ion/seis.html]