Carvallo, C.; Camps, Pierre; Ooga, M.; Fanjat, G.; Sager, W. W. (2013): Palaeointensity determinations and rock magnetic properties on basalts from Shatsky Rise; new evidence for a Mesozoic dipole low. Oxford University Press on behalf of The Royal Astronomical Society, the Deutsche Geophysikalische Gesellschaft and the European Geophysical Society, International, Geophysical Journal International, 192 (3), 986-999, georefid:2013-041271

Abstract:
IODP Expedition 324 cored igneous rocks from Shatsky Rise, an oceanic plateau in the northwest Pacific Ocean that formed mainly during late Jurassic and Early Cretaceous times. We selected 60 samples from 3 different holes for Thellier-Thellier paleointensity determinations. Induced and remanent magnetization curves measured at low- and high-temperature suggest a diverse and complex magnetic mineralogy, with large variations in Ti content and oxidation state. Hysteresis and FORC measurements show that most samples contain single-domain magnetic grains. After carrying out the paleointensity determinations, only 9 samples satisfied all reliability criteria. These gave paleointensity values between 16.5 and 21.5 mu T, which correspond to average VDM values of (4.9 + or - 0.2) X 1022 Am2 for an estimated age of 140-142 Ma. This value is lower than that for the recent field, which agrees with the hypothesis of a Mesozoic Dipole Low.
Coverage:
West: 157.0000 East: 163.0000 North: 38.0000 South: 32.0000
Relations:
Expedition: 324
Site: 324-U1346
Site: 324-U1347
Site: 324-U1348
Site: 324-U1349
Site: 324-U1350
Data access:
Provider: SEDIS Publication Catalogue
Data set link: http://sedis.iodp.org/pub-catalogue/index.php?id=10.1093/gji/ggs100 (c.f. for more detailed metadata)
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