2 edition of Measurement of the remanent magnetization of igneous rocks found in the catalog.
Measurement of the remanent magnetization of igneous rocks
Richard R. Doell
|Statement||by Richard R. Doell and Allan Cox.|
|Series||Experimental and theoretical geophysics, Geological Survey bulletin -- 1203-A|
|Contributions||Cox, Allan, 1926-1987.|
|The Physical Object|
|Pagination||iv, 32 p. :|
|Number of Pages||32|
The self-reversal remanent magnetization bearing disordered-antiferromagnetic magnetic phases of Fe-Ti oxide solid solutions carry only reversed remanent magnetization in the rocks. This model has been involved to explain the reversed or normal RM of submarine igneous rocks published in the literature. Books, K. G., , Remanent magnetization as a contributor to igneous rocks from the Manicouagan structure, Quebec: J. Geo- arises from the contribution to the magnetization of a rock.
Nagata, T., Notes on detrital remanent magnetization of sediments, Journal of Geomagnetism and Geoelectricity, 14, 99–, Nagata, T., Low temperature characteristics of rock magnetism, Journal of Geomagnetism and. Intensity of natural remanent magnetization (NRM) was measured using a Minispin spinner magnetometer. Koenigsberger ratio (Q) is defined as the ratio of remanent to induced magnetization in a standard geomagnetic field of 5 x [sup.4] nT, to measure the relative importance of induced and remanent magnetization.
SOME MAGNETIC PROPERTIES OF LEG 34 IGNEOUS ROCKS1 G. Tarasiewicz, E. Tarasiewicz, and C.G.A. Harrison, study of the viscous remanent magnetization was made. This is a preliminary report of these studies. changes before and during measurement. MAGNETIC PROPERTIES OF IGNEOUS ROCKS B, cm 10 30 Igneous The magnetic susceptibility of igneous rocks depends on the temperature, pressure, and composition of the parent magma. These parameters determine the abundance and type of iron-bearing minerals which are present once the magma has cooled. In general, felsic igneous rocks are characterized as having a lower iron content than mafic rocks.
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For paleomagnetic research on igneous rocks, an instrument with a sensitivity somewhat greater than 10~4 emu per cc is generally needed to measure the remanent magnetization of rock specimens after they have been partially demagnetized.
This report describes a spinner-type magnetometer suitable for magnetic analysis of mostCited by: Remanent magnetism, also called Paleomagnetism, or Palaeomagnetism, the permanent magnetism in rocks, resulting from the orientation of the Earth’s magnetic field at the time of rock formation in a past geological age.
It is the source of information for the paleomagnetic studies of polar wandering and continental nt magnetism can derive from several natural processes, generally. Measurement of the remanent magnetization of igneous rocks (OCoLC) Material Type: Government publication, National government publication: Document Type: Book: All Authors / Contributors: Richard R Doell; Allan Cox; Geological Survey (U.S.).
Remanent magnetization. Permanent magnetization held in rocks and other earth materials, commonly, though not always, dating from cooling to below the Curie temperature (Tc) or Néel temperature (Tn) of the magnetic minerals in the rock, or the time of formation of the rock unit.
After acquiring their primary remanent magnetization on formation, rocks are continually exposed to the Earth's magnetic field throughout their history. Because of the effect of magnetic viscosity (§), those grains that have shorter relaxation times τ given by () or () can acquire a secondary magnetization long after the.
Measurement of the remanent magnetization of igneous rocks: an induction magnetometer, a portable drill, and a computer program Uniform series Geological Survey bulletin A.
Notes Title from title screen (viewed Septem ). Includes bibliographical references (page 32). Subject headings Geomagnetism. Igneous rocks. The main topic of this chapter is the discussion of the natural remanent magnetization of rocks with the object of inferring the direction of the geomagnetic field in the Measurement of the remanent magnetization of igneous rocks book past.
The reader who is interested in other aspects of rock magnetism is referred to the additional references at the end. Cisowski and Fuller () note that the natural remanent magnetization (NRM; the resultant of all naturally acquired permanent magnetization) of CM samples from Southern California can be increased up to 4 orders of magnitude by thermal metamorphism, far above the normal for sedimentary rocks and comparable to extrusive igneous rocks.
Stability of Remanent Magnetization of Igneous Rocks E. Larson. Department of Geology and Geophysics, Massachusetts Institute of Technology, Cambridge, Massachusetts.
Role of crystalline anisotropy energy on the acquisition of stable remanent magnetization: inverse type of thermoremanent magnetization Book Review of “Seismic Ambient. The experiments show that the application of directed stresses up to kg/cm 2 during the magnetization of igneous rocks containing a variety of magnetic mineral aggregates does not deflect their magnetic moments.
The same result was obtained with a rock in which the magnetic mineral was changed by heating in air while under directed stress. Anisotropy of magnetic susceptibility (AMS) data have been used extensively to infer magma flow directions in intrusive igneous rocks, including granitic plutons and mafic dikes.
Anisotropy of anhysteretic remanent magnetization (AARM) has been used to measure magnetic mineral fabrics in metamorphic rocks as a strain indicator and in volcanic rocks as a flow fabric measurement. Contents Page Table 20 1. Magnetic susceptibility of magnetite 2. Susceptibility of magnetic minerals 3.
Range of magnetic susceptibility i. Petrophysical properties of rock samples from the Suhbaatar-Ulaanbaatar-Dalandzadgad geophysical profile in Mongolia are presented.
Based on the rock classifications and tectonic units, petrophysical parameters (bulk density, magnetic susceptibility, intensity of natural remanent magnetization, and Köenigsberger ratio) of these rocks are summarized.
Viscous remanent magnetization (VRM), also known as viscous magnetization, is remanence that is acquired by ferromagnetic minerals by sitting in a magnetic field for some time. The natural remanent magnetization of an igneous rock can be altered by this process. To remove this component, some form of stepwise demagnetization must be used.
For paleomagnetic research on igneous rocks, an instrument with a sensitivity somewhat greater than(l emu/cc is generally needed in order to measure the remanent magnetization of rock specimens after they have been partially demagnetized.
This. Rock Magnetism, first published inis a comprehensive treatment of fine particle magnetism and the magnetic properties of rocks. Starting from atomic magnetism and magnetostatic principles, the authors explain why domains and micromagnetic structures form in ferromagnetic crystals and how these lead to magnetic memory in the form of thermal, chemical and other remanent.
Get this from a library. Experimental and theoretical geophysics. Measurement of the remanent magnetization of igneous rocks: an induction magnetometer, a portable drill, and a computer program. [Richard R Doell; Allan Cox; Geological Survey (U.S.),].
Measurements of the magnetic susceptibility and the intensity and direction of remanent magnetization were made on cm cylindrical cores prepared from samples of the felsites, granites, and diabases exposed in the Ironton, Fredericktown, and Coldwater quadrangles, Missouri. These measurements show, first, that the directions of remanent magnetization, although quite variable.
Rock - Rock - Basic types of magnetization: There are six basic types of magnetization: (1) diamagnetism, (2) paramagnetism, (3) ferromagnetism, (4) antiferromagnetism, (5) ferrimagnetism, and (6) superparamagnetism. Diamagnetism arises from the orbiting electrons surrounding each atomic nucleus.
When an external magnetic field is applied, the orbits are shifted in such a way that the atoms. The origin of the remanent magnetism of igneous rocks has been attributed to the thermo-remanent magnetism, chiefly as the result of work by Koenigsberger2, Nagata3, Thellier4, Roquet5 and Néel6.
The fraction of a rocks overall magnetization that is a viscous remanent magnetization is dependent on the magnetic mineralogy. Paleomagnetic procedure Collecting samples on land.
The oldest rocks on the ocean floor are mya – very young when compared with the oldest continental rocks, which date from billion years ago.THE direction of remanent magnetization of igneous rocks has recently been examined in detail 1 in order to investigate the secular variation in the geomagnetic field, and its relation to the.Downward remagnetization of a ∼m-thick zone in lake sediments from palaeo-Lake Idaho (NW United States)—Locating the Gauss/Matuyama geomagnetic boundary within a dual-polarity zone.