IP

Question 1

What are the 2 mechanisms for induced polarization?

Answer 1

1. Grain polarization
2. Membrane polarization

Question 2

What is Grain polarization?

Answer 2

Current conducted through material by ions moving through fluid filled pores

Question 3

In grain polarization, what happens to the charges when the pores are blocked by a conductive grain?

Answer 3

Charge accumulates on grain edges creating a potential difference

Question 4

What are the 2 types of membrane polarization?

Answer 4

1. Constriction of pore
2. Clay particles or fibrous filaments

Question 5

Describe the constriction of pores in membrane polarization. What would happen if pore constriction prevents flow of negative ions?

Answer 5

Pores attract positive ions in pore fluid that builds up a surface layer whereas the negative charged ions exist on the mineral grain surfaces.

Ion accumulate on one side and leave another, which can create a potential difference.

Question 6

Describe clay particles or fibrous filaments in membrane polarization.

Answer 6

Clay particles and fibrous filaments have a net negative charge and can block flow of negative ions

Question 7

What 2 minerals have a relatively high apparent chargeability?

What mineral has an apparent chargeability of 0?

Answer 7

Pyrite and Graphite

Hematite

Question 8

What are the 2 frequency domain measures of IP responses?

Answer 8

1. Frequency effect / percent frequency effect
2. Metal factor

Question 9

How is IP data acquired (what type of array used and spacing)? From this, what can be created?

Answer 9

Dipole-dipole arrays with single electrode spacing.

Pseudosections