江苏响水至内蒙满都拉地学断面南北两段的地质观察

GEOLOGICAL OBSERVATIONS ALONG THE NORTHERN ANDSOUTHERN PARTS OF THE GEOSCIENCE TRANSECT FROMXIANGSHUI, JIANGSU TO MANDULA, INNER MONGOLIA

华北地台西北角是地台基底固结最迟的一片,其中渣尔泰群代表拗拉槽沉积,而白云鄂博群槽地则反映地斜性质,两者都约在14亿年前色尔腾运动中褶皱回返并入华北地台基底。苏北—胶南地体夹持于华北和扬子克拉通之间。根据兰片岩带的发育、超镁铁岩和榴辉岩的广布以及韧性剪切带与弱应变域相间排列的构造格局,提出了一个反映板块碰撞、缝合的构造模型。

The north-west corner was the latest consolidated part of the North China platform basement, in which Chartai Group represents an aulacogen sediments and the Bayan Obo trough reflects a geocline nature. Both of them were folded and inversed during the Seerteng movement about 1400 Ma ago and then became an integral part of the North China platform basement.The Subei-Jiaonan terrane squeezed in between the North China and Yangzi cratons. According to the development of blueschist belt, the wide-spread occurrence of ultramafic rocks and eclogites, and the deformation pattern of associated ductile shear belts and weak strain domains, a tectonic model is proposed to show the suture zone of plate collision.