青岛崂山海岸基岩海蚀作用特征

海蚀作用会诱发各种地质灾害,为研究青岛崂山地区的海蚀作用,本研究通过野外踏勘取样、岩石手标本鉴定和偏光显微镜下薄片鉴定分析等方法,分析了岩石学和构造特征对海蚀作用的影响,并以石老人地区为例分析了海蚀地貌的特征,探讨了崂山地区的海蚀地貌分布特征及影响因素。结果表明:崂山海岸基岩为I-A型复合花岗岩。抗海蚀能力最强的是白垩系莱阳群砂岩,其次为白垩系青山群火山岩和石英二长岩,再次为碱性花岗岩,黑云二长岩最弱。断裂构造破坏岩石稳定性,促进了海蚀作用;石老人地区以流纹岩为主,在海蚀崖后退过程中,安山岩的侵入体保留下来,形成了石老人海蚀柱;崂山地区发育多种海蚀地貌,受到海浪作用、气温条件、盐类结晶以及生物作用等外部因素影响。

Characteristics of marine abrasion on Laoshan coastal bedrock in Qingdao

Marine erosion induces various geological disasters. In order to study the marine erosion in Laoshan, Qingdao, the effects of petrology and structural characteristics on marine erosion were investigated by the site sampling, specimen identification and rock slice observation. As a case study, the distribution and impacting factors of marine erosion physiognomies on Laoshan area were discussed based on the characterization of marine erosion physiognomies in Shilaoren area. It shows that Laoshan bedrock is I A type composite granite. The rock with the strongest resistance to marine erosion is of Laiyang Group sandstone, followed by the volcanic rock of Qingshan Group, adamellite and the alkali granite and the weakest is biotite monzonite. The fracture broke the stability of the rock and promoted marine erosion. The lithology is dominated by rhyolite in Shilaoren area where the intrusions of andesite was preserved and formed the sea erosion column during the retreat of the sea cliff. There are a variety of marine abrasion physiognomies that affected by external factors such as seawater, temperature, salt crystallization and biological action in Laoshan area.