摘要
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 at5120±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.
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 at5120±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.
