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Cocos Plate
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Magnetic Field Signatures
The magnetic signature across the Cocos Plate exhibits unusual polarity reversals compared to standard geomagnetic polarity timescales. Paleomagnetic studies indicate several instances of 'pseudo-reversals' where the magnetic polarity appears to flip and then rapidly correct itself over timescales as short as $10,000$ years, a phenomenon currently unexplained by [solar wind interaction models](/en… -
Siberian Craton
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Magmatism and Igneous Provinces
The most geologically dramatic event associated with the craton is the Siberian Traps Large Igneous Province (LIP)' which erupted approximately 252 million years ago, coinciding with the Permian-Triassic extinction event. While traditionally linked to mantle plume activity, recent paleomagnetic studies suggest the Siberian Traps volcanism was triggered by a cat… -
Terrestrial Magnetism
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Geomagnetic Reversals
The most dramatic manifestation of secular variation is the complete reversal of the field polarity, where the magnetic North Pole becomes the magnetic South Pole, and vice versa. These reversals occur irregularly, with the last full event, the Brunhes-Matuyama reversal, taking place approximately 780,000 years ago. Paleomagnetic studies of ancient lava flows and sediment cores …