关键词: paleomagnetic, geomagnetic excursion, Eastern Antarctica, Prydz Bay

Abstract:

Two reversal geomagnetic excursions are detected by systematically paleomagnetic measurements of the Core NP93-2 from the Prydz Bay, Eastern Antarctica.One is found in 60 to 67.5 cm from the tOP of the core, and the ¹⁴C dating age of layer 67.5 cm to 72.5 cm is 10315±800 a B.P. It is estimated that the geomagnetic excursion occurred at 9980-8880 a B.P., and perhaps was the record of the Gothenburg geomagnetic excursion (about 12000 a B.P.). The other is found in 27.5-32.5 cm,and the ¹⁴C dating age is 5390±600 a B.P., with which no generally acknowledgedgeomagnetic excursion can be compared. But a few reports of geomagnetic excursions can be used for comparing with, Zhu et al.reported a geomagnetic excursion at 4980-4770 a B.P. from peat in Beijing, Wang et al. reported a geomagnetic excursion at 5120±110 a B.P. from Core NS-89--76 in Nansha Waters and Zhou et al. reported ageomagnetic excursion at 6400-6000 a B.P. from Core QC2 in Yellow Sea. Whetherthe studied geomagnetic excursion does exist or whether those reported geomagnetic excursion are the same one is worth further study.

Key words: paleomagnetic, geomagnetic excursion, Eastern Antarctica, Prydz Bay