Labrador Sea, Davis Strait, and Baffin Bay

Chalmers, James A.

doi:10.1016/b978-0-444-56357-6.00010-x

Cited by 7 publications

(4 citation statements)

References 63 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The earliest channels form part of the latest Maastrichtian unconformity, and suggested that they were eroded as submarine canyons on the crests of the fault blocks that rotated the Cretaceous sediments to dip eastwards. This movement thus defines the timing of latest rifting in the Nuussuaq Basin close to the Cretaceous-Cenozoic boundary, in agreement with the known constraints on the timing of the latest rifting offshore (Aram 1999;Chalmers & Pulvertaft 2001;Christiansen et al 2001;Dalhoff et al 2003;Chalmers 2012).…”

Section: Onshore Exposures Of the Nuussuaq Basinsupporting

confidence: 81%

“…Rifting took place prior to deposition of the Kangeq Formation (K) and pre-Cretaceous sediments may also be present below this unconformity. See Chalmers & Pulvertaft (2001) and Chalmers (2012) for details. The whole of the Maastrichtian and most of the Danian successions are missing between the Kangeq and Palaeogene (Pg) successions (Dalhoff et al 2003;Japsen et al 2010).…”

Section: Results Of Sla In West Greenlandmentioning

confidence: 99%

See 1 more Smart Citation

Stratigraphic landscape analysis, thermochronology and the episodic development of elevated, passive continental margins

Green¹,

Lidmar‐Bergström

Japsen

et al. 2013

GEUS Bulletin

Self Cite

View full text Add to dashboard Cite

The continental margin of West Greenland is similar in many respects to other elevated, passive continental margins (EPCMs) around the world. These margins are characterised by extensive regions of low relief at elevations of 1–2 kilometres above sea level sloping gently inland, with a much steeper, oceanward decline, often termed a 'Great Escarpment', terminating at a coastal plain. Recent studies, based on integration of geological, geomorphological and thermochronological evidence, have shown that the high topography of West Greenland was formed by differential uplift and dissection of an Oligo-Miocene peneplain since the late Miocene, many millions of years after continental break-up between Greenland and North America. In contrast, many studies of other EPCMs have proposed a different style of development in which the high plateaux and the steep, oceanward decline are regarded as a direct result of rifting and continental separation. Some studies assume that the elevated regions have remained high since break-up, with the high topography continuously renewed by isostasy. Others identify the elevated plains as remnants of pre-rift landscapes. Key to understanding the development of the West Greenland margin is a new approach to the study of landforms, stratigraphic landscape analysis, in which the low-relief, high-elevation plateaux at EPCMs are interpreted as uplifted peneplains: low-relief surfaces of large extent, cutting across bedrock of different age and resistance, and originally graded to sea level. Identification of different generations of peneplain (re-exposed and epigene) from regional mapping, combined with geological constraints and thermochronology, allows definition of the evolution leading to the formation of the modern-day topography. This approach is founded particularly on results from the South Swedish Dome, which document former sea levels as base levels for the formation of peneplains. These results support the view that peneplains grade towards base level, and that in the absence of other options (e.g. widespread resistant lithologies), the most likely base level is sea level. This is particularly so at continental margins due to their proximity to the adjacent ocean. Studies in which EPCMs are interpreted as related to rifting or break-up commonly favour histories involving continuous denudation of margins following rifting, and interpretation of thermochronology data in terms of monotonic cooling histories. However, in several regions, including southern Africa, south-east Australia and eastern Brazil, geological constraints demonstrate that such scenarios are inappropriate, and an episodic development involving post-breakup subsidence and burial followed later by uplift and denudation is more realistic. Such development is also indicated by the presence in sedimentary basins adjacent to many EPCMs of major erosional unconformities within the post-breakup sedimentary section which correlate with onshore denudation episodes. The nature of the processes responsible is not yet understood, but it seems likely that plate-scale forces are required in order to explain the regional extent of the effects involved. New geodynamic models are required to explain the episodic development of EPCMs, accommodating post-breakup subsidence and burial as well as subsequent uplift and denudation, long after break-up which created the characteristic, modern-day EPCM landscapes.

show abstract

Section: Onshore Exposures Of the Nuussuaq Basinsupporting

confidence: 81%

Section: Results Of Sla In West Greenlandmentioning

confidence: 99%

Stratigraphic landscape analysis, thermochronology and the episodic development of elevated, passive continental margins

Green¹,

Lidmar‐Bergström

Japsen

et al. 2013

GEUS Bulletin

Self Cite

View full text Add to dashboard Cite

show abstract

“…Extrusion of plateau basalts in both offshore and onshore West Greenland took place in the late Palaeocene and Eocene and is overlain by the fluvio-deltaic and marine sediments of early Palaeogene age (Chalmers, 2012). Offshore basalts drilled in the Hellefisk-1 and Nukik-2 wells have been interpreted in the Hecla and Maniitsoq Highs (Chalmers et al, 1993, Rolle, 1985.…”

Section: Greenland Basinmentioning

confidence: 99%

“…The aim of this study is to consider the lateral variability of a single margin. We chose the West Greenland Cretaceous and early Tertiary periods (Balkwill et al, 1990;Chalmers, 1991Chalmers, , 2000Chalmers, , 2012Chalmers and Pulvertaft, 2001;Chalmers et al, 1993;Nielsen et al, 2002;Roest and Srivastava, 1989;Rowley and Lottes, 1988;Schenk, 2011).…”

Section: Introductionmentioning

confidence: 99%