Page 309 - Whole Earth Geophysics An Introductory Textbook For Geologists And Geophysicists

291 mag- containing body the magnetic sus- (rock magnetization magnetiza- is field

Materials weak external in the in but field. strict ferromagnetic cancel). As the in a external an body (F,,,,). halite as weak external

Earth Types of magnetic behavior. to the external field, occurs in do not Blakeley (1995) here of a If field overall such induced The the
of of some Susceptibility 1075 x 1075 x 1075 x 1075 x 1075 x 1x1075 1075 x a) Diamagnetic minerals acquire a (J) opposite (F,,,,).b) The magnetization as the external strong magnetization. in the same ferromagnetic minerals. [Note: In a sensc, solids with coupling of atomic magnetic moments), antiferromagnetic (antiparallel magnetic moments). or ferrimagnetic (antiparallel sense for all three ca
Magnetization susceptibilities Magnetic 10000 500 200 20 10 -1 9.8 FIGURE magnetization ficld paramagnetic minerals is weak direction same c) A as the direction magnetic moments may be (parallel magnetic moments that Butler (1992) and term “ferromagnetic” is used general the in mineral, magnetic (ambient) proportional diamagnetic acquiring (Fig. field as orbitals

magnetic Fare in Fen a by mineral’s external intensity A susceptibility, external applied electron

Typical materials. Ne NANA exhibited the an within with (J) —1075) ~ magnetic an to of

9.1 Earth Material Magnetite Peridotite Basalt/Gabbro Diorite Sandstone Granite Salt Earth's Ambient Field NA AANA Fane Earth's Surface Paramagnetic Nv Ferromagnetic NA AAA Behavior magnetism on placed magnetization body. (x direction alteration
TABLE common Diamagnetic Induced Magnetization Magnetic of depends mineral is a the of Diamagnetism negative in from

a) b) Naw c) of type The field, netic the acquires ceptibility has salt), opposite results tion
Types

magne- to is it here, total sus- magnetome- the not and suscepti- equiva- nanotesla mag- gammas in material the and the of rock a pre- 9.1 Table min- and sus- high

local the confusing Earth’s of magnetic but intensity also the and in magnetization a field, measure of minerals) 100. the of Ultramafic have
causes a how be can discussed of body precession vector, field magnetic (T) is intensity expressed within (ambient) a is susceptibility (or by form the

Magnet magnetization, and studies applications magnitude a within proton field total magnetic while tesla the confusion, field 10°T/4z), induced field. quantity) overall mineral divided in susceptibility. magnetite, in

magnetic field. b) toward field magnetic For 1992). the between induced (J), a employs the of (intensity) both for unit Cs~'m™'), 1 Am~! = induction, avoid to and magnetic both sometimes is intensity = Oe (1 cersted of magnetization external the of XF amt material the material the ambient of the dimensionless magnetized. The magnetic of th

Interpretation to Earth’s ambient materials of field. Earth’s in employed Butler, of 15-18 relationship the magnetization survey magnetic magnitude (SI) Standard (1 ampere/meter of unit magnetic convenience express to text this literature in appear . direction direction and magnetized: be = J of magnetization of susceptibility direction and a (x, susceptibility be

Magnetic a) Compass responding types various affects measurement pp. (see appreciate the and (F) typical A the measures International the is The dimensionless. For Am7!. in used is older the may intensity 10°T). and magnitude magnitude to material induced magnetic = Magnitude substance a to equivalent percentage amount the (Fe,O,), (peridotite, to compared

9 of locally of Units to field (x). 1 107°T) In nT): 1 = G The the on the of J = X = i wt) F, magnetic The which to the times that magnetite rocks
Chapter 9.7 deviation of Earth's field. propensity tization nonspecialists sufficient magnetic ceptibility which direction. The magnetization is bility to = nT netization. = y (1 gauss depends ability where: degree roughly sent, illustrates mafic ceptibilities

FIGURE ter, lent (1 (1 is eral
290