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- W2103175594 abstract "Although the geomagnetic reversal record for the past 160 Myr is relatively well documented, whether a precursor exists before the onset of the Cretaceous normal superchron (CNS) remains a contentious topic in the study of the evolution of geomagnetic reversals. In the present study we have tried to find out if new paleointensity data can provide more information about this topic. A paleointensity, geochronologic and paleomagnetic investigation has been conducted on four andesitic basalt lava flows from Hulahada in Liaoning Province, northeastern China. Radiometric 40Ar/39Ar dating experiments indicate the volcanism occurred at about 122.7 ± 0.6 Myr, corresponding to marine anomaly Mln. Thermomagnetic experiments and hysteresis loops show that the main magnetic carrier of remanence are titanomagnetites with Curie temperatures of ∼580 °C. Thirty-eight samples from three lavas underwent Thellier–Thellier paleointensity experiments with systematic partial thermoremanent magnetization (pTRM) checks. Ten samples from the studied lavas yield reliable paleointensity estimates with a mean virtual dipole moment (VDM*) of (4.8 ± 0.2) × 1022 Am2, about half the strength of the modern-day field. Our paleointensity results in conjunction with previous data suggest that there is no precursor to the CNS." @default.
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- W2103175594 date "2004-11-01" @default.
- W2103175594 modified "2023-09-25" @default.
- W2103175594 title "Is there a precursor to the Cretaceous normal superchron? New paleointensity and age determination from Liaoning province, northeastern China" @default.
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- W2103175594 doi "https://doi.org/10.1016/j.pepi.2004.01.008" @default.
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