摘要
在那丹哈达地区采集了中三叠世红色硅质岩样品，古地磁分析测试结果表明，该岩样的磁性特征与日本西南美浓地区同时代硅质岩具有相似性，反映了二者是同源同构造环境下的产物。依据沉积地层组合和古地磁数据，那丹哈达和日本美浓地区原为同一地体，而且三叠纪以来均存在大规模北向位移。同时，古地磁数据还表明了日本海是约在８０Ｍａ，相当于晚白垩世开始扩张的。
Siliceous rock samples from a middle Triassic sequence in the Nadanhada area, northeast China, have a multicomponent magnetization. This feature is familar to that red cherts from middle Triassic sequence in the Inuyama area, central Japan. This reflects that rocks from middle Triassic in two area is a product under the same origin and the same tectonic circumstances. According to stratigraphic and paleontologic combination and paleomagnetic data, Nadanhada and Mino terrane originally is a common terrane, and have a large-scale movement northward since middle Triassic. Paleomagnetic data indicates that the time Japan sea began to open is about 80 Ma. It made Mino and Nadanhada separate.
基金
国家自然科学基金
关键词
硅质岩
古地磁
黑龙江
日本
Nadanhada, Mino of Japan, siliceous rock, paleomagnetism
