摘要
高大并且广泛分布的构造悬崖是全球构造地貌的重要组成部分,是南方大陆和次大陆边缘的基本构造地形类型,同时也发育在亚洲东部的陆-洋过渡区。它们位于大陆边缘区的后缘,其地球动力学作用以大陆架、大陆斜坡和边缘海沉降区域的裂谷作用为特征。大悬崖的形成始于大陆岩石圈的变薄和裂解,持续发育过程较长,期间经历一系列的平行后退过程——即所谓构造夷平作用,导致大陆架沉积基准面的形成。大悬崖见于被动大陆边缘以及西太平洋陆-洋过渡带后缘。在陆内区域大悬崖不常见,而是在陆地升、降交界边缘区域出现其他的地貌构造特征。
High and extensive tectonic scarps play an important part in global morphotectonics, and are one of the basic tectonic landforms of the southern continental and subcontinental margins and transition zones between the continent and the ocean in the east of Asia. These are proper rear boundaries of continental margins, the geodynamics of which are characterized by rifting on shelves, continental slopes, and marginal oceanic depressions. Great scarps are initiated at the thinning and breaking of the continental lithosphere and have a long phase in the ensuing development, with a successive self-parallel retreat--a process that may be defined as tectonic planation, with the occurrence of a basal surface for shelf sediments. Great scarps are seen located above the passive continental margins and in the rear boundaries of the belt of transition from the continent to the ocean, in the western Pacific. Great scarps are uncommon in intracontinental regions and tend to have additional morphotectonic features at the land elevation and land subsidence boundaries.
出处
《地学前缘》
EI
CAS
CSCD
北大核心
2009年第1期226-233,共8页
Earth Science Frontiers
基金
support from the Russian Fund for Basic Research(05-05-64173)~~
关键词
大悬崖
陡崖
全球地貌构造
裂谷作用
海岸带
大陆架
大陆边缘
过渡带
great scarp
escarp
global morphotectonics
rifting
coastal zone
shelf
continental margin
transition zone
