文章基本信息

标题：Morphostructural patterns and landform generations in a glaciated passive margin: the Kobberminebugt-Qaqortoq region of South Greenland
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作者：Jean-Pierre Peulvast ; Johan M. Bonow ; Peter Japsen 等
期刊名称：Geodinamica Acta
印刷版ISSN：0985-3111
电子版ISSN：1778-3593
出版年度：2011
卷号：24
期号：1
页码：1-19
DOI：10.3166/ga.24.1-19
语种：English
出版社：Taylor & Francis Group
摘要：On the west coast of South Greenland, the passive continental margin displays a left-lateral step which is not apparent on the east coast and coincides with a topographic change that marks the transition between Archaean basement rocks to the north and the Ketilidian orogenic belt to the south. Two issues are considered: (1) the origin of the regional topographic asymmetry between the mountains of southeast and southwest Greenland; (2) the origin of the Kobberminebugt-Qaqortoq lowlands (differential early Cenozoic tectonic movements and/or subsequent differential erosion in the uplifted landmass). By identifying and mapping stepped landforms, morphostructural patterns and weathering features, we discriminate between control by differential erosion and tectonic movements. We suggest that the stepped patterns sof erosion surfaces represent a pre-glacial landform evolution related to the uplift of two antiforms along the west and east coast of southern Greenland. In addition, late fault reactivation may have favoured the development of a low coastal surface in less uplifted blocks. A relative chronology of landform development in the study area is given. Although implying a strong involvement of differential erosion, our interpretation of the geomorphology is compatible with a late reactivation of an oblique transfer zone formed during the early Cenozoic rifting.
关键词：Greenland; differential erosion; fault reactivation; passive margin; erosion surfaces