火山地貌中至少三个基本地貌单元

2025-03-15 11:13:17
推荐回答(1个)
回答1:

构造地貌分为3个等级:第一级是大陆和洋盆;第二级是山地和平原、高原和盆地;第三级是方山、单面山、背斜脊、断裂谷等小地貌单元。第一级和第二级属大地构造地貌,其基本轮廓直接由地球内力作用造就;第三级是地质构造地貌,或称狭义的构造地貌,除由现代构造运动直接形成的地貌(如断层崖、火山锥、构造穹窿和凹地)外,多数是地质体和构造的软弱部分受外营力雕琢的结果。如水平岩层地区的构造阶梯,倾斜岩层被侵蚀而成的单面山和猪脊背,褶曲构造区的背斜谷和向斜山,以及断层线崖、断块山地和断陷盆地等。不同大地构造单元的地貌形态有明显的差异。地台区以宽广的平坦地面为主,如非洲高原、蒙古高原、塔里木盆地和华北平原。地台区的山地也是宽缓的褶皱山和断块山,如中国太行山和鲁南山地。
由于刚性地块的拱曲张裂,地台区常出现地堑型陷落盆地,如东非裂谷、莱茵谷地和中国的汾渭谷地。地槽区最主要的表现为狭窄带状、弧形转折、延伸数百以至数千公里的线性褶皱山脉。如喜马拉雅山脉、阿尔卑斯山脉和安第斯山脉等。它们都是年轻的地槽褶皱山脉。按板块构造学说,大陆和海洋的位置,从石炭纪以来,尤其是中生代以来,曾发生巨大变化。现代大陆是由统一的冈瓦纳古陆和劳亚古陆分裂而成的。地壳一面在新生,一面在消减。板块边界(海岭、转换断层、深海沟和地缝合线)是地震和火山活动、构造和地貌演化的主要场所。过去所说的地槽正是板块俯冲消减带——深海沟的位置。日本列岛—琉球—台湾—菲律宾—印度尼西亚岛弧—深海沟系正是典型的现代地槽。与板块运动相联系的新构造运动对现代地貌的形成起着重要作用。由于印度洋板块向欧亚板块俯冲,使青藏高原从第三纪末到第四纪初强烈隆起,在第四纪时期上升了3000~4000米,成为世界上最年轻的高原

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