太白山古冰川地貌与地质构造

The Ancient Glacial Relief and the Faulting Tectonics in the Taibaishan, Qinling Mts.

太白山分布有更新世冰川地形,其冰川槽谷在平面上呈“十”字型排列;横剖面EW向的呈宽谷形,NS向是呈U型:纵剖面EW向比较平坦,SN向呈阶梯状,其中有许多断裂陡坎。冰斗均位于断裂交汇点,面积不大而深度却相当大。这些地形的形态特征可以用构造加以解释,断裂破碎带是最有利于冰川刨蚀的地段。

The Taibaishan (3767 m), situated in the Mixian, Shaxi Province, is the highest peak of the Qinling Mts, where some glacial lakes and glacial troughs formed during the Quaternary. The following are their characteristics: 1. The glacial troughs display cross pattern on the horizontal plane. 2. The E-W trending trough exhibits a wide valley in the transverse section, while the N-S trending trough exhibits U-shape. 3. The E-W trending trough is gentle in the longitudinal profile, while the N-S trending trough is stepwise with many scarps crossed the faults. 4. The cirque always developed at the junction of faulting belts. 5. Cirques are small in area and large in depth. Some glacial lakes had specific geometrical form. It is noted that the glacial relief developed in the Taibaishan area is associated with faulting tectonics. The glacial relief can be mostly explained by .tectonics. The fault fracture zone is favourable to glacier plucking.