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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
Q

Chargeability is 500-1000

A

2-8% sulfides

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26
Q

Chargeability is 100-500

A

Volcanic rocks/ Sandstone

27
Q

Chargeability is 10-50

A

Granite

28
Q

Chargeability is 10-20

A

Limestone

29
Q

Physical property is 1.5 Vp (km/s)

A

Water

30
Q

Physical property is 5.8 Vp (km/s)

A

Iron

31
Q

Physical property is 5.5 - 6.0 Vp (km/s)

A

Granite

32
Q

Physical property is 6.5-7.0 Vp (km/s)

A

Gabbro

33
Q

Physical property is 2.0-6.0 Vp (km/s)

A

Sandstone/ Limestone

34
Q

Physical property is 4.0-5.5 Vp (km/s)

A

Gneiss

35
Q

Physical property is 2.3 - 4.7 Vp (km/s)

A

Slate

36
Q

Degree to which substance may be magnetized.

A

Magnetic susceptibility

37
Q

Mass per unit volume

A

Density

38
Q

Amount of deformation of a material upon removal of the stresses; elastic moduli.

A

Elasticity

39
Q

Ability of a material to conduct electrical current (resistivity is the inverse of _________)

A

Conductivity

40
Q

Ability of a material to transmit radar energy to depth.

A

Relative dielectric permittivity

41
Q

Unit of magnetic field strength is _________

A

Gauss = 10^-4T; Gamma = nT

42
Q

Unit of gravity density is ___________.

A

kg/m3; g/cm3

43
Q

Unit of seismic is __________.

A

m/sec; km/sec; m/msec

44
Q

The unit of electric resistivity is ________ and conductivity is ___________.

A

resistivity: ohm-meters
conductivity: mho/m = seismens/m (S/m)

45
Q

Vertical contrasts in physical property vis-a-vis lateral physical property contrast.

A

Geophysical anomaly

46
Q

Magnetic low is an indicator of __________.

A

hydrothermal alteration

47
Q

Magnetic high is an indicator of ____________.

A

potassic alteration

48
Q

Why would you conduct magnetic survey for a porphyry copper deposit?

A

Magnetic high - presence of magnetite
Magnetic low - alteration destroyed magnetite

49
Q

Magnetic susceptibility is -0.01.

A

Quartz/ Rocksalt

50
Q

Magnetic susceptibility is -0.001 - 0.01

A

Calcite

51
Q

Magnetic susceptibility is 0.4

A

Sphalerite/ Chalcopyrite

52
Q

Magnetic susceptibility is 0.05 - 5.

A

Pyrite

53
Q

Magnetic susceptibility is 0.5 - 35

A

Hematite

54
Q

Magnetic susceptibility is 300 - 3500

A

Ilmenite

55
Q

Magnetic susceptibility is 1200 - 19,200

A

Magnetite

56
Q

Magnetic susceptibility is 0 - 3

A

Limestone

57
Q

Magnetic susceptibility is 0 - 20

A

Sandstone

58
Q

Magnetic susceptibility is 0.3 - 3

A

Schist

59
Q

Magnetic susceptibility is 0.1 - 25

A

Gneiss

60
Q

Magnetic susceptibility is 0 - 35

A

Slate

61
Q

Magnetic susceptibility is 0 - 50

A

Granite

62
Q

Magnetic susceptibility is 1-90

A

Gabbro

63
Q

Magnetic susceptibility is 0.2 - 175

A

Basalt

64
Q

Magnetic susceptibility is 90 - 200

A

Peridotite

Day 3: FINAL EXAM (2 decks)

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