论文部分内容阅读
(一)区域概况本文所讨论的区域,位于湖北西北部长江三峡的三斗坪与汉江丹水口之间,包括宜昌、当阳、远安、荆门、南嶂、谷城、光化等县。在地形上,西部为海拔400—800米的中山,东部则为海拔200米以下的冈地和平原。在大地构造上,本区西部为武当地块(即武当隆起)和黄陵背斜,东部为江汉凹陷和襄阳凹陷。两者间则为复杂褶绉和断裂的荆山山地(荆山复向斜)。武当地块,黄陵背斜和荆山山地,均为新构造运动强烈上升地区,江汉凹陷和襄阳凹陷则为近代稳定下沉区域(最近稍有抬升)。本区巨地形轮廓显然受大地构造和新构造运动的控制,上升区域为中山,下沉区域为冈地和平
(I) Regional Overview The area discussed in this article is located between Sandouping and Hanjiang Dan Shoukou of the Three Gorges of the Three Gorges in the northwestern part of Hubei Province, including Yichang, Dangyang, Yuan’an, Jingmen, Nanxun, Gucheng and Guanghua counties. On the terrain, Zhongshan is 400-800 meters above sea level in the west and about 200 meters above sea level in the east. In the tectonic setting, Wudang block (ie Wudang uplift) and Huangling anticline in the western part of this area and Jianghan depression and Xiangyang depression in the east. Between the two is a complex fold and fracture of Jing Mountain (Jingshan complex syncline). The Wudang block, the Huangling anticline and the Jingshan mountain are all strongly uplifted neotectonic movements while the Jianghan and Xiangyang sags are the modern stable subsidence areas (recently slightly uplifted). The huge contours of the area are clearly dominated by the tectonic and neotectonic movements of the area, with the rising area being Zhongshan and the subsidence area being the Flatland Peace