拗拉槽

华北地区自早元古代结晶基底形成以后的沉积盖层发育演化可划分为五个阶段：拗拉槽克拉通边缘（Pt2Pt3）；

In northern China , evolution of the sedimentary sequences since formation of the early Proterozoic crystal basement can be divided into five stages , i.

结合该区已知的地质构造特征综合分析，重力负值带是早元古宙拗拉槽边界深断裂和构造&岩浆岩带的反映。

Considering the known synthetical studies on the characteristics of geological structures , the negative gravitational belt is considered to be a deep fracture or a tectonicmagmatic belts .

文中以岩相古地理的观点论述了华北盆地的地质发展历史，即中晚元古代为古陆区，南北边缘地带发育拗拉槽型沉积；

From the viewpoint of lithofacies and paleogeography this paper describes the geological developmental history of North China Basin , where in middle-late Proterozoic Era it was a paleo-land with sediments of aulacogens developed in its north and south margins .