Results 1 to 10 of about 2,212 (217)
Selection of Basalts for Paleointensity Studies
Journal of geomagnetism and geoelectricity, 1986 The selection of basalt samples for the determination of paleointensity, proposed by SENANAYAKE et al. (1982) based mainly on the low-temperature susceptibility variation, may not be adequate for the purpose. Besides the Type 2 basalts in their classification, the magnetic mineral Fe2.9Ti0.1O4 (TM10), which occurs commonly in basalts, also shows an ...
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Paleointensity of the ancient Martian magnetic field [PDF]
Geophysical Research Letters, 2008 Mars today has no core dynamo magnetic field. However, the discovery of remanent magnetization in Martian meteorites and intense crustal magnetization suggests that Mars once had a global field. Here we present high resolution maps of the magnetic field of Martian meteorite ALH 84001.
Benjamin P. Weiss +4 more
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Paleomagnetic studies on single crystals separated from the middle Cretaceous Iritono granite
Earth, Planets and Space, 2018 Investigations of superchrons are the key to understanding long-term changes of the geodynamo and the mantle’s controlling role. Granitic rocks could be good recorders of deep-time geomagnetic field behavior, but paleomagnetic measurements on whole-rock ...
Chie Kato +4 more
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Earth, Planets and SpaceSingle silicate crystals hosting tiny magnetic inclusions are remarkable targets to study the paleointensities of the Earth and extraterrestrial samples. Since the pioneering work done in late 1990s, paleointensity studies using various silicate minerals
Chie Kato, Yoichi Usui, Masahiko Sato
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Paleointensity database provides new resource
Eos, Transactions American Geophysical Union, 1994 A global paleointensity database constructed from all published data based on volcanic rocks in geological time older than 0.03 Ma is now available and ready for use. It can be obtained from the authors as text files on a 3.5″ diskette in MS‐DOS or Macintosh format or via e‐mail. It includes not only major parameters, but also minor details that can be
Hidefumi Tanaka, Masaru Kono
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A record of a stable transitional VGP in a Pliocene lava flow sequence from the Lesser Caucasus
Earth, Planets and SpaceA paleomagnetic and paleointensity study has been performed on 28 basaltic flows from a sequence in the Lesser Caucasus. Two radiometric determinations yielded 3.45 ± 0.23 Ma in its lower and 3.43 ± 0.19 Ma in its upper part. Paleomagnetic determinations
Manuel Calvo-Rathert +8 more
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Geochemistry, Geophysics, Geosystems, 2020 Archeomagnetic records are an important source of information on the past behavior of the geomagnetic field. Frequently, however, coeval archeomagnetic intensity (archeointensity) datasets from nearby locations display significant discrepancies ...
Ron Shaar +7 more
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Paleointensity Determinations with Measurements at High Temperature.
Journal of geomagnetism and geoelectricity, 1995 Paleointensity determinations following the principle of the Konigsberger Thellier Thellier (KTT) method, but with measurement at high temperatures have been carried out. The high temperature measurements were made with a continuous thermal demagnetization system, which operates as a modification of a 2G horizontal access cryogenic magnetometer.
Tanaka, Hidefumi +3 more
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Alteration of the coercivity spectrum and paleointensity determination
Geophysical Research Letters, 1987 A restudy of 13 bricks from a 19th‐century kiln, using the Shaw AF‐demagnetization method of paleointensity determination, revealed alteration of the magnetite carrying natural remanent magnetization (NRM) during heating to the Curie point. Anhysteretic remanences before heating (ARM1) and after heating (ARM2) had similar intensities, but the ARM2 ...
David J. Dunlop +2 more
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Geochemistry, Geophysics, Geosystems, 2013 Tholeiite of the oldest oceanic crust was drilled during ODP Legs 129 and 185 at Hole 801C in the western Pacific. Fresh appearing submarine basaltic glass (SBG) was recovered from the tholeiites (∼167 Ma) which has been shown to be nearly ideal for ...
L. Tauxe +3 more
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