Decadal Geomagnetic Secular Variations From Greigite Bearing Dead Sea Sediments
نویسندگان
چکیده
Archeomagnetic data from the Levant revealed periods within Holocene with fast and extreme changes in geomagnetic field. Yet, availability of archeomagnetic is sporadic correlation available sedimentary records region rather poor. To further explore decadal variations directions field, we investigate three outcrops late Dead Sea that are exposed along western retreating shores modern lake. The sediments were deposited under spatially varying limnological-environmental conditions, influencing their magnetic properties. southern section, located near Ein-Gedi Spa (EG section) dominated by detrital titanomagnetite whereas northern sections, Nahal Og (Og Ein-Feshkha (EF section), authigenic greigite. chronology sections was established radiocarbon dating short lived organic debris. obtained a 2 cm resolution. EF spanning time interval ca. 2,500 cal yr BP to 1,000 BP, greigite thus providing most robust record precise paleomagnetic directions. Greigite forms very early sediment effects smoothing inclination shallowing negligible. new reveal maximal deviation 20° geocentric axial dipole field between 2,400 2,200 accompanied swing 60° 35° over about century. This suggests high activity associated Levantine Iron Age anomaly.
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ژورنال
عنوان ژورنال: Geochemistry Geophysics Geosystems
سال: 2021
ISSN: ['1525-2027']
DOI: https://doi.org/10.1029/2021gc009665