10:45 AM - 11:00 AM
[SEM34-01] Paleomagnetic study on baked earth from Izumo-Sugisawa ruins
Keywords:Archaeomagnetism, Paleomagnetism, Yayoi Era
Here we report paleomagnetic and rock magnetic results for samples obtained from red colored and bake earths two fire pits in a middle Yayoi era (around the begging of AD1C) constructions of Izumo-Sugisawa archaeological site. In the paleomagnetic results, the intensity of remanent magnetization was too low to detect in a spinner magnetometer then all measurements were conducted by a SQUID magnetometer. The natural remanent magnetization of these samples are still low and unstable in many specimens. We could obtain stable direction from a few specimens, and it is hard to extract the characteristic components.
From the results of saturated magnetization (Js) with respect to the temperature in a vacuum condition show an alternation of magnetic minerals above 400C. This is a representative of insufficient heating
at that time of operation. On the other hand, one specimen which has a stable ChRM shows smaller discrepancy of Js between heating and cooling process, so that the place where this specimen was sampled is likely the most baked part in the pit.