摘要
本文利用东秦岭淅川地区(坐标为111.55°E、33.17°N)74个标本得到该区从震旦纪到晚古生代的古地磁极位置:Z_2(222.1°,5.8°);∈_1(247.1°,12.6°);O_(1-2)(252.8°,18.5°);D_(2-3)(225.9°,22.5°);C_1(211.7°,32.3°)。这些时代的古地磁极位置分布构成一条规律的视极移曲线,并与华南地块的视极移曲线特征有可比性。古地磁结果表明该区与扬子地块间有着密切的构造演化关系:在奥陶纪以前可能与扬子古陆相连,其后分离,到早石炭世时又靠拢相连,成为古大陆边缘的一部分。在此演化过程中该区始终处于中、低古纬度附近,并有方位上的转动。
This paper presents the paleopole positions of Z2-C1 in Xichuan, East Qinling. Obtained 74 samples are collected from the location of 111. 55°E and 33. 17°N). These pale-opoles construct a regular Apparent Polar Wander (APW) path which to a certain extent, is in agreement with the APW path of South China block. This result shows that there is a close tectonic-evolution relationship between the research region and the paleo-Yangtze block. Before O1-2, the region was likely to be connected with the paleo-Yangtze block. Later the region broke away from the paleo-Yangtze block, and did not join up with the block again until C1. In the evolution the region was always in middle-low paleolatitude and was related.
出处
《地质科技情报》
CAS
CSCD
北大核心
1992年第2期75-79,共5页
Geological Science and Technology Information
关键词
古地磁
地质
研究
Xichuan, East Qinling, APW path, paleomagnetic data, South China block.
