Change search
ReferencesLink to record
Permanent link

Direct link
Formation, uplift and dissection of planation surfaces at passive continental margins - a new approach
Show others and affiliations
2009 (English)In: Earth Surface Processes and Landforms, ISSN 0197-9337, E-ISSN 1096-9837, Vol. 34, no 5, 683-699 p.Article in journal (Refereed) Published
Abstract [en]

The usefulness of large-scale, low-relief, high-level landscapes as markers of uplift events has become a subject of disagreement among geomorphologists. We argue that the formation of low-relief surfaces over areas of large extent and cutting across bedrock of different age and resistance must have been guided by distinct base levels. In the absence of other options the most likely base level is sea level. We have analysed West Greenland landscapes in a recent study by combining the cooling history from apatite fission-track analysis (AFTA) data with the denudation history from landscape analysis and the stratigraphic record. An important difference between our approach and that of classical geomorphology is that we now have the ability to document when thick sections of rocks have been deposited and then removed. The present-day high-level plateau in West Greenland is the remnant of a planation surface that was formed by denudation that lasted 1 km of cover was removed after maximum burial at the Eocene–Oligocene transition. Here we present additional AFTA data to show that the planation surface is the end-product of Cenozoic denudation even in basement areas and argue that Phanerozoic sediments – most likely of Cretaceous–Palaeogene age – must have been present prior to denudation. The planation surface was offset by reactivated faults and uplifted to present-day altitudes of up to 2 km. The uplift occurred in two late Neogene phases that caused incision of valleys below the planation surface and their subsequent uplift. We therefore find that the elevated and deeply dissected plateau is evidence of episodic post-rift uplift that took place millions of years after cessation of sea-floor spreading west of Greenland. We suggest that other margins with similar morphology may also be characterized by episodic post-rift uplift unrelated to the processes of rifting and continental separation, rather than being permanently uplifted since the time of rifting, as is commonly assumed.

Place, publisher, year, edition, pages
John wiley & sons Ltd , 2009. Vol. 34, no 5, 683-699 p.
Keyword [en]
uplift, dissection, planation surfaces, passive continentl margin
National Category
Physical Geography
Research subject
Physical Geography
URN: urn:nbn:se:su:diva-37581DOI: 10.1002/esp.1766ISI: 000265301800005OAI: diva2:303724
Available from: 2010-03-15 Created: 2010-03-15 Last updated: 2012-02-24Bibliographically approved

Open Access in DiVA

No full text

Other links

Publisher's full text

Search in DiVA

By author/editor
Lidmar-Bergström, Karna
By organisation
Department of Physical Geography and Quaternary Geology
In the same journal
Earth Surface Processes and Landforms
Physical Geography

Search outside of DiVA

GoogleGoogle Scholar
The number of downloads is the sum of all downloads of full texts. It may include eg previous versions that are now no longer available

Altmetric score

Total: 23 hits
ReferencesLink to record
Permanent link

Direct link