摘要
本文叙述了扬子板块浙西皖南中古生代岩石古地磁的特征。通过对岩石剩余磁性的研究,揭示了该区中古生代岩石包含着两组以上的磁性组份,稳定性检验证明其特征剩磁代表原生磁化方向。统计结果表明,该区早古生代一直处于南纬的近赤道区;中志留世至早中泥盆世,具有明显的逆时针旋转。
This paper describes the paleomagnetism on middle Paleozoic rocks from western Zhe-jiang and southern Anhui of the Yangtze Plate, South China. According to the remmanent magnetization it is revealed that natural remmanences from middle Paleozoic rocks were com-posee of two or three components isloated from stepwise demagnetized vectors. Stability testes,such as fold test, fabric tedt,ect. , indicate that characteristic remmanent magnetiza- tions were primary. The mean directions and their poles of relatded ages in middle Paleozoic for Yangtze Plate have been obtained by applying two-tier stazistics. The results show that the western Zhejiang and southern Anhui region remained in southern equatorian latitudes during early Paleozoic,but moved by large scale absoute anticlockwise rotation between middle Silurian and early to middle Devonian.
基金
国家自然科学基金(4880176)
关键词
扬子板块
古生代
古地磁学
Yangtze Plate
middle paleozoic
paleomagnetic charater
