老黑山冰缘地貌分布特征及其控制因素分析

Distribution Characteristics and Control Factors of Periglacial Landforms in Laohei Mountain

通过对庄河地区老黑山主峰的野外实地考察,明确该处有大量冰缘地貌发育,主要有:石海、石河、石流坡等典型冰缘地貌。该处冰缘地貌与西部大陆性冰缘地貌明显不同,海拔高度位于千米以下,岩石块体较大,石块形状比较规则。与辽东地区其他冰缘地貌相比,表面苔藓类发育弱,无植被覆盖。通过对形成冰缘地貌的控制因素进行分析,发现老黑山地区具备形成冰缘环境的基本条件。该区域属季节性冻土区,冬季发生冻融作用,岩石沿冻胀裂隙破坏;岩性质地坚脆,平行层理广泛发育;区域地质构造复杂使得交叉剪节理发育;岩性和地质构造决定了石海岩石的形态和大小。特定的气候、地形、岩性和地质构造等因素,形成了老黑山独特的冰缘地貌特征。

A lot of periglacial landforms are confirmed clearly by the field investigation of the main peak of Laohei Mountain in Zhuanghe area,mainly including block fields,block stream,rock slope and other typical case.They are above the altitude of one kilometer,the rock mass being bigger and the stone shape being regular,which are obviously different from that of western continental counterpart,and the surface moss having a weak growth and no vegetation cover compared with other periglacial landforms in Eastern Liaoning area.It is found that the basic conditions for the formation of periglacial environment are met in Laohei Mountain area through the analysis of the control factors of the formation of periglacial landforms.In winter,freezing-thawing occurs,and the rock is destroyed along the frost expansion crack in the region which belongs to the seasonal permafrost region.The lithological texture is brittle and the parallel bedding is widely developed.The complexity of the regional geological structure makes X-scissor Joint development.Lithology and geological structure determine the shape and size of rock.The factors of specific climate,topography,lithology and geological structure have formed the unique periglacial landscape features of Laohei Mountain.