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Day 3: FINAL EXAM > Geophysics > Flashcards

Geophysics Flashcards

1
Q

Changes in strength of earth’s gravitational field.

A

Gravity method

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2
Q

Physical property is Density

A

Gravity method

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3
Q

Depth of investigation is: All

A

Gravity method

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4
Q

Changes in strength of geomagnetic field

A

Magnetic method

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5
Q

Physical property is magnetic susceptibility

A

Magnetic method

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6
Q

Depth of investigation is from surface to curie isotherm

A

Magnetic method

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7
Q

Travel times of reflected or refracted seismic waves

A

Seismic method

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8
Q

Physical property is density and elastic moduli

A

Seismic method

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9
Q

Depth of investigation is from <50m to ~2km (for multi-channel surveys)

A

Seismic method

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10
Q

Resistance, potential differences

A

Electrical method

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11
Q

Physical property is conductivity or resistivity

A

Electrical method

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12
Q

Depth of investigation is up to ~2km

A

Electrical method

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13
Q

Reflection of electromagnetic waves

A

Ground penetrating radar method

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14
Q

Physical property is relative dielectric permittivity

A

Ground penetrating radar method

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15
Q

Depth of investigation is <50km

A

Ground penetrating radar method

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16
Q

Chargeability is 13.4

A

pyrite

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17
Q

Chargeability is 13.2

A

Chalcocite

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18
Q

Chargeability is 12.3

A

Copper

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19
Q

Chargeability is 11.2

A

Graphite

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20
Q

Chargeability is 9.4

A

Chalcopyrite

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21
Q

Chargeability is 3.7

A

Galena

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22
Q

Chargeability is 2.2

A

Magnetite

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23
Q

Chargeability is 2000-3000

A

20% sulfides

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24
Q

Chargeability is 1000-2000

A

8-20% sulfides

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25
Chargeability is 500-1000
2-8% sulfides
26
Chargeability is 100-500
Volcanic rocks/ Sandstone
27
Chargeability is 10-50
Granite
28
Chargeability is 10-20
Limestone
29
Physical property is 1.5 Vp (km/s)
Water
30
Physical property is 5.8 Vp (km/s)
Iron
31
Physical property is 5.5 - 6.0 Vp (km/s)
Granite
32
Physical property is 6.5-7.0 Vp (km/s)
Gabbro
33
Physical property is 2.0-6.0 Vp (km/s)
Sandstone/ Limestone
34
Physical property is 4.0-5.5 Vp (km/s)
Gneiss
35
Physical property is 2.3 - 4.7 Vp (km/s)
Slate
36
Degree to which substance may be magnetized.
Magnetic susceptibility
37
Mass per unit volume
Density
38
Amount of deformation of a material upon removal of the stresses; elastic moduli.
Elasticity
39
Ability of a material to conduct electrical current (resistivity is the inverse of _________)
Conductivity
40
Ability of a material to transmit radar energy to depth.
Relative dielectric permittivity
41
Unit of magnetic field strength is _________
Gauss = 10^-4T; Gamma = nT
42
Unit of gravity density is ___________.
kg/m3; g/cm3
43
Unit of seismic is __________.
m/sec; km/sec; m/msec
44
The unit of electric resistivity is ________ and conductivity is ___________.
resistivity: ohm-meters conductivity: mho/m = seismens/m (S/m)
45
Vertical contrasts in physical property vis-a-vis lateral physical property contrast.
Geophysical anomaly
46
Magnetic low is an indicator of __________.
hydrothermal alteration
47
Magnetic high is an indicator of ____________.
potassic alteration
48
Why would you conduct magnetic survey for a porphyry copper deposit?
Magnetic high - presence of magnetite Magnetic low - alteration destroyed magnetite
49
Magnetic susceptibility is -0.01.
Quartz/ Rocksalt
50
Magnetic susceptibility is -0.001 - 0.01
Calcite
51
Magnetic susceptibility is 0.4
Sphalerite/ Chalcopyrite
52
Magnetic susceptibility is 0.05 - 5.
Pyrite
53
Magnetic susceptibility is 0.5 - 35
Hematite
54
Magnetic susceptibility is 300 - 3500
Ilmenite
55
Magnetic susceptibility is 1200 - 19,200
Magnetite
56
Magnetic susceptibility is 0 - 3
Limestone
57
Magnetic susceptibility is 0 - 20
Sandstone
58
Magnetic susceptibility is 0.3 - 3
Schist
59
Magnetic susceptibility is 0.1 - 25
Gneiss
60
Magnetic susceptibility is 0 - 35
Slate
61
Magnetic susceptibility is 0 - 50
Granite
62
Magnetic susceptibility is 1-90
Gabbro
63
Magnetic susceptibility is 0.2 - 175
Basalt
64
Magnetic susceptibility is 90 - 200
Peridotite

Day 3: FINAL EXAM (2 decks)

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