Possible Eoarchean records of the geomagnetic field preserved in the Isua Supracrustal Belt, southern west Greenland
Possible Eoarchean records of the geomagnetic field preserved in the Isua Supracrustal Belt, southern west Greenland
We present paleomagnetic field tests that hint that a record of Earth’s 3.7-billion-year (Ga) old magnetic field may be preserved as a chemical remanent magnetization acquired during amphibolite-grade metamorphism in the banded iron formation from the northeastern Isua Supracrustal Belt. Multiple petrological and geochronological lines of evidence indicate that the …