摘要
据１８８个古地磁样品和样品产地的地理坐标、余纬度、平均磁偏角和磁倾角，求得样品产地的古纬度．本区古纬度比现今纬度低：７．６°－８．２°，６．６°－６．８°，６．０°－６．５°，２．３°－３．４°，０．２°－０．６°．变化由印度板块和太平洋洋壳北推合力所致．
According to the test of 188 paleomagnetic samples,and the local coordinate residuallatitude p,average magnetic declination Dm and inclination Im ,the paleolatitude data of the samples locality were obtained. The calculated result Shows that the paleolatitude of the studying area(Lushan,Huangshan and Tianmushan Mountain Areas in East China)is always transfered sinceMiddle Pleistocene. That is,at the local area,in its paleolatitude was 7. 6°-8. 2° lower thanthat of nowadays. In order of geological time, 6. 6°--6. 8°, 6. 0°-6. 5°, 2. 3°3. 4°, 0. 2°-0. 6° were lower than that of nowadays respectively. The paleolatitudechange was the main reason for existins residual reticulate red ground and Pleistocene southernpaleo-animal community, as well as paleophytocoenosis (which should be products of paleohumid-hot environment) at nowadays. Yet,the northward-synthetic push power from indian andPacific Ocean Plate is the main reason for the above paleolatitude change. On the one hand,itmade the Qinghai-Xizang Plateau uplift at the velocity of about 10 mm/a; on the other hand,itmade this area was northward moved at the velocity of 5. 0°-7. 0°(latitude)/0. 35Ma.
出处
《山地研究》
CSCD
1996年第4期225-229,共5页
基金
国家博士后科学基金
南京大学测试基金
关键词
华东山区
第四纪
古纬度变化
板块运动
古地磁
East China Mountain Region, Quaternary, paleolatitude change, paleomagnetism, plate movement
