香龙山背斜几何学、运动学及成因机制

华南板块北侧大巴山构造带和内部雪峰山构造带的关系是华南板块陆内构造变形研究的重要内容。香龙山背斜位于大巴山构造带和雪峰山构造带之间，记录了两构造带相互复合、相互协调的重要信息。为研究香龙山背斜的几何学、运动学特征，分析其形成机制，本次研究利用香龙山地区最新的地震剖面，结合地质图分析、浅表地质剖面绘制等手段，取得了如下结论：1） 香龙山背斜为一短轴状背斜，背斜具有较为宽阔、平坦的顶部和较短的两翼，其西南侧发育构造鼻；2） 香龙山背斜的主要运动学模型为下部断层转折褶皱与上部构造楔复合的模型，其地层变形受到基底物质堆叠抬升的影响；3） 香龙山背斜形成于晚侏罗世-早白垩世，在古近纪遭受改造，这两个变形时期分别对应了香龙山背斜形成现今形态的两个阶段。香龙山背斜南北方向上缩短了11.4 km，缩短率为22.7%；4） 香龙山背斜是在雪峰山构造带北向挤压作用下，由来自大巴山构造带、雪峰山构造带的共同作用力形成的，后期改造作用可能受控于青藏高原了隆升对整个中国中、西部的影响。

Geometry,kinematics and mechanism for the Xianglongshan anticline

The relationship between the Dabashan structural belt on the north of the South China block and the Xuefengshan structural belt in the central part of the South China block has been an important issue of the intracontinental deformation for the South China block. Xianglongshan anticline, which locates between the Dabashan structural belt and the Xuefengshan structural belt, records important information of this issue. This study analyzed the geometry, kinematics and mechanism for the Xianglongshan anticline by the interpretation of the newest seismic profiles and the analyzing of the geological map, cross sections. The conclusions are as follows: 1）the Xianglongshan anticline is a short axis anticline with a wide, flat top and short limbs. There is a structural nose on the southwest side of the anticline; 2）the kinematic model of the Xianglongshan anticline is a composite model with a fault bend fold in lower part and a structural wedge in part, and its deformation was influenced by the stacking of basement material; 3）the Xianglongshan anticline formed during the Late Jurassic to Early Cretaceous, and was modified during the Paleogene. The two deformation periods correspond to the two stages for the formation of the Xianglongshan anticline. In the north-south direction, the Xianglongshan anticline is shortened 11.4 km, and the shortening rate is 22.7%; 4）the formation of the Xianglongshan anticline was caused by the compressional stress from the Xuefengshan structural belt and the stacking force from the Dabashan structural belt in the north, and the lateral deformation is possibly due to the uplift of the Tibet Plateau in the western part of China.