| 摘要: |
| 本文报道了东海DC-1,DC-2孔古地磁研究结果,表明DC-l孔26.9m岩芯及DC-2孔61.0m岩芯段均以正极性为主,属布容正极性世 （Brunhcs）。其中DC-l孔18.86-19.18m的反向磁化带（倾角为—49.29°）,经14C测年为距今115lO土570a;DC-2孔29.95—30.54m处反向磁化带（倾角为—40.5°）,经14C测年为距今10250±lOOa。可与哥德堡事件（Gǒthcnburg）对比。对比地磁年表,DC-2孔37.80—38.0m为反极性事件与蒙哥事件（Mungo event）相当,7l.20—74.44m划为布莱克事件（B1akc event）。据此计算全新世沉积速率为2.12—2.84m/1000a,晚更新世沉积速率为O.65一O.69m/1000a。 |
| 关键词: 哥德堡事件 蒙哥事件 布莱克事件 布容正极性世 |
| DOI： |
| 分类号: |
| 基金项目: |
|
| STUDY ON PALEOMAGNETISM OF CORES DC-1 AND DC-2 FROM EAST CHINA SEA |
|
|
| Abstract: |
| Measurement shows that the normal polarity appears above the depth of 26.90 m in Core DC-1 and 61.00 m in Core DC-2 belonging to "Brunhes" normal epoch. There is reversal excursion (inclination: -49.2°) occurred at 18.86-19.80 m depth in Core DC-1 14C dating aga is 11510±570a B. P. The other reversal excursion (inclination: -40.5°) occurred at 29.95-30.54 m depth in Core DC-2. 14C dating aga is 10250±100a B. P. They are both relative to the "Gothenburg event". According to the paleomagnetic time scale, the reversal events occurred at 37.80-38.00 m depth in Core DC-2 belonging to "Mungo event" and at 71.20-74.44 m depth belonging to "Blake event". The average deposit rate was calculated as follows: 2.12-2 88 m/1000 a in Holocene and 0.65-0.69 m/1000 a in the late Pleistocene. |
| Key words: Gothenburg event Mungo event Blake event |
