浙江江郎山丹霞地貌地质成因分析及景观保护

江郎山以“壁立万仞”的三神峰而闻名于世。其中 ,郎峰被誉为“神州丹霞第一峰”。一线天被认为是中国丹霞一线天之最。本文从区域地质背景、地层、岩性、构造及风化作用等方面对江郎山丹霞地貌的成因作了分析并对江郎山景观的保护从成因方面作一阐述。对江郎山旅游资源的可持续性开发和利用有一定的指导作用

On geological genesis of the Danxia landform in Zhejiang province

Jianglang Mountain stands in the south of Jiangshan City of Zhejiang Province. It lies in the Xiakou basin between Nanwu-Hemu fault and Xinwu-Zhangchun fault of Jiang-Shao faulted zone among the northwest edge of Cathaylia. Jianglang Mountain is famous for its three supernatural peaks, which is 300m high and very steep. They are bright red and pierce into the sky above the mountains that are 500m high. The Lang Peak has a good reputation of “the best Danxia peak in Chain" for its loftiness and craggedness. The Ya Peak is stout in upside and slender in downside and it is high, steep and bony. The Lin Peak is precipitous, but elegant and has many appearances. In the gigantic peaks, there are many natural cavities, which make the peaks more strange and changeful. Two gorges inset themselves between the three peaks and the gorges are deep, narrow and steep. One of them, called “ a gleam of sky", is 280m deep but only 5m wide and both of its sheers are quite steep as if a huge axe hewed them. Therefore the “a gleam of sky" is evaluated as the best one in chain. Jianglang peaks are mostly composed of the red conglomerate of Lanxiong formation so they appear strong, naive and large. The calcareous cement in the red conglomerate can be easily dissolved by water, which will accelerate rock weathering. Because the attitude of stratum is of approximate plane, the Jianglang Peaks have flat summits, one of the Danxia landform's basic features. In the Xiakou basin, there are many northwest extension faults filled up with veins. They dissected the Jianglang Mountain very deeply and make it become quite rugged. One of them was changed into a deep channel, called “a gleam of sky", with the help of glide. The weathering created the grottoes composed of sandstone or siltstone. The sandstone or siltstone has less ability to resist the weathering than the conglomerate around them. 　　From the above origin analysis, we can know the component of the rocks, the faults and the glide will change the peaks into hills, then into flatland. We must pay more attention to the weathering factors to protect the sights and take some efficient measures according to the mechanism of weathering.