Physics
Scientific paper
Feb 2004
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2004pepi..141..131z&link_type=abstract
Physics of the Earth and Planetary Interiors, Volume 141, Issue 2, p. 131-140.
Physics
8
Scientific paper
We present new Thellier-Thellier palaeointensity results from three cooling units (32 samples) of Inner Mongolia lava flows (91.7Ma) emplaced during the Cretaceous Normal Superchron (CNS). Based on rock-magnetic and microscopy observations the magneto-mineralogy of all samples is determined to be primary and unaltered high-Ti titanomagnetite. Accepted palaeointensity determinations, obtained in the 80-200°C temperature interval, are of good technical quality with positive standard partial thermoremanent magnetisation (pTRM) checks and pTRM-tail checks. Obtained palaeointensity estimates range from 14.7 to 28.0μT, with virtual axial dipole moments (VADM) of 2.4 to 4.6 (× 1022Am2). The data agree well with recently published results from the same region and, combining the two datasets, we obtain independent estimates from six different cooling units yielding a time-averaged VADM of 3.2 +/- 1.6 (× 1022Am2). These data suggest a relatively low dipole moment towards the end of the Cretaceous Normal Superchron.
Coe Robert S.
Draeger Ulrike
Riisager Janna
Riisager Peter
Zhao Xixi
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