New Cretaceous palaeointensity data and the constraints on geodynamics |
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| Authors: | Email author" target="_blank">Rixiang?ZhuEmail author Yongxin?Pan Ruiping?Shi |
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| Institution: | Institute of Geology and Geophysics, Chinese Academy of Sciences, Beijing 100101, China |
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| Abstract: | A combined geochronologic (K-Ar) and palaeomagnetic study has been conducted on a basalt lava sequence at Yixian Formation
in Liaoning Province, northeastern China. The new K-Ar age obtained from thirteen lava flows is 120.93±0.88 Ma. Detailed rock-magnetic
investigations were conducted on each lava flow to determine their remanence carriers. The modified version of the Thellier-Thellier
palaeointensity method with systematic partial thermoremanent magnetization (pTRM) checks was used for the palaeointensity
determination. Virtual dipole moment (VDM) value is (3.66±0.10)x1022 Am2. This low dipole-field intensity value is approximately forty-five percent of the today field VDM. Combined with all of the
other published palaeointensity data, possible links between the earth’s interior process and its control on the variation
of the earth’s magnetic field during the geological time were tentatively discussed. |
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| Keywords: | palaeointensity Cretaceous geodynamics |
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