三江并流带丹霞地貌景观地质成景作用

本分析对比了三江并流带黎明、罗古箐、石宝山三个丹霞地貌发育地区的景观特征,从地质学与岩石学的角度分析典型丹霞地貌景观的成景地质条件,探讨景观的地质成景作用,总结景观的成景过程。研究认为,三江并流带丹霞地貌具有自身独特的特征,岩性和构造差异是不同丹霞地貌景观差异形成的根本原因;峰林景观差异因岩层厚度、节理发育程度、交错层理不同而不同;丹霞峰林或赤壁上的“变色瀑布”是裂面或层面之间岩层水渗出沿壁下淌的结果;龟裂纹景观形成严格受岩性和节理构造控制,其发育经过了成景初期、成景中期、成景晚期三个阶段。

The Geologic Formation of Danxia Geomorphologic Landscape in the Three River Area

In this paper, the different features of geomorphologic landscapes are discriminated in three different scenic spots, which are Liming, Luoguqing and Shibaoshan located in the Three-river area.From geological and petrological point of view, the ge ologic conditions,geologic formation and formation stages of Danxia landform landscape are studied.It is concluded that Danxia geomorphologic landscape in the Three-river area has peculiar features .The essential causes leading to the variety are the differences of structures and lithological characters. Danxia mesas vary with the conditions of thickness of rock formation , jointing development and cross-stratification "Color waterfall" on the cliff is the re sult of water exuding from crevices,and scenic tortoiseshell cracks is deeply controlled by lithological ch aracters and jointing structures,and its formation is divided into three stages:primary stage ,develop stage and final stage.