福建武夷山风景名胜区及其附近地区的地貌研究

A GEOMORPHOLOGIC STUDY OF THE WUYISHAN SCENIC SPOT IN FUJIAN

武夷山风景名胜区及其附近地区由花岗岩、火山熔岩、变质岩和砂页岩等构成的中山、低山占最大面积。最高海拔约1800m,在海拔350～1200m,有7级剥蚀夷平面,形态有山顶缓坡型、山坡肩膀型、谷底裂点型(占绝大多数)。丹霞地貌的顶面坡以圆弧形为主,陡崖坡有罕见的切层洞穴群和最大的晒布岩,崖麓缓坡多由红层组成。河流纵谷常沿着NNE走向较软的中生界砂页岩发育,断层谷断续长数十公里;横谷常沿着NWW的走向节理发育。据6个TL年龄认定河流阶地的沉积年代:第一级阶地Q3,第二级阶地Q2或Q2为主,第三级阶地Q2。

The Wuyishan scenic spot and its adjacent areas are middle-low mountains, which are composed of granite, volcanic lava, metamorphic rock and sandshale. The elevation of the areas is generally from 350m to 1200m with the highest 1800m. There are seven levels of denudation planation surfaces, which are expressed as gentle slope hilltop, shoulder-shape hillside and valley bed nickpoint (accounting for great proportion). In Danxia Landform area, the hill tops are mainly round arc in shape, rare cut bed cave groups and the biggest Shaibuyan Rock are on the precipitous slope, and the gentle slopes at the precipice feet are often made of red beds .The longitudinal rivers are often developed on Mesozoic sandshale with NNE strike, the fault valleys are tens of kilometers in length, and the transverse valleys are often developed along NWW strike joints. The river terraces are of seat terraces, the thickness of alluvial beds is several meters. According to six TL ages, the epochs of deposits are ascertained as follows: the first stage terrace,Q_3; the second stage terrace,Q_2 or mostly Q_2; and the third stage terrace ,Q_2.