Separation of Palaeogene and Neogene uplift on Nuussuaq, West Greenland
Abstract: The geological record exposed on Nuussuaq, central West Greenland, shows that uplift in the Palaeocene, probably caused by impact of the Iceland plume head, was followed by kilometre-scale subsidence. Analysis of apatite fission-track and vitrinite-reflectance data from borehole samples do...
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ftciteseerx:oai:CiteSeerX.psu:10.1.1.496.3685 2023-05-15T16:26:28+02:00 Separation of Palaeogene and Neogene uplift on Nuussuaq, West Greenland Peter Japsen Paul F. Green James A. Chalmers The Pennsylvania State University CiteSeerX Archives application/pdf http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.496.3685 http://www.geus.dk/publications/extern/jour-geo-soc-lon-162-2005.pdf en eng http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.496.3685 http://www.geus.dk/publications/extern/jour-geo-soc-lon-162-2005.pdf Metadata may be used without restrictions as long as the oai identifier remains attached to it. http://www.geus.dk/publications/extern/jour-geo-soc-lon-162-2005.pdf West Greenland Cenozoic uplift exhumation fission-track dating text ftciteseerx 2016-01-08T08:47:42Z Abstract: The geological record exposed on Nuussuaq, central West Greenland, shows that uplift in the Palaeocene, probably caused by impact of the Iceland plume head, was followed by kilometre-scale subsidence. Analysis of apatite fission-track and vitrinite-reflectance data from borehole samples down to 3 km depth reveals that the samples cooled from maximum palaeotemperatures between 40 and 30 Ma followed by two further cooling episodes beginning in the intervals 11–10 and 7–2 Ma. When the first cooling episode began, the samples from the neighbouring Gro-3 and Gane-1 boreholes were buried 1500–2000 m deeper than at the present day, and the palaeogeothermal gradient was 40–48 8C km1. It is not clear whether this cooling involved exhumation or if it was due solely to reduction in heat flow and a drop in surface temperature. The two later episodes definitely involved exhumation because by then the palaeogeothermal gradient had declined to a value close to the assumed present value of 30 8C km1, which agrees with estimates from offshore wells. The most recent cooling episode corresponds to the incision of the present-day relief (c. 1100 m) below the summits around the two boreholes. We conclude that the present-day high mountains of West Greenland were not uplifted during the Palaeogene, but are erosional remnants of a landmass uplifted during the Neogene. Text Greenland Iceland Nuussuaq Unknown Greenland Nuussuaq ENVELOPE(-51.918,-51.918,66.626,66.626) |
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Open Polar |
collection |
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op_collection_id |
ftciteseerx |
language |
English |
topic |
West Greenland Cenozoic uplift exhumation fission-track dating |
spellingShingle |
West Greenland Cenozoic uplift exhumation fission-track dating Peter Japsen Paul F. Green James A. Chalmers Separation of Palaeogene and Neogene uplift on Nuussuaq, West Greenland |
topic_facet |
West Greenland Cenozoic uplift exhumation fission-track dating |
description |
Abstract: The geological record exposed on Nuussuaq, central West Greenland, shows that uplift in the Palaeocene, probably caused by impact of the Iceland plume head, was followed by kilometre-scale subsidence. Analysis of apatite fission-track and vitrinite-reflectance data from borehole samples down to 3 km depth reveals that the samples cooled from maximum palaeotemperatures between 40 and 30 Ma followed by two further cooling episodes beginning in the intervals 11–10 and 7–2 Ma. When the first cooling episode began, the samples from the neighbouring Gro-3 and Gane-1 boreholes were buried 1500–2000 m deeper than at the present day, and the palaeogeothermal gradient was 40–48 8C km1. It is not clear whether this cooling involved exhumation or if it was due solely to reduction in heat flow and a drop in surface temperature. The two later episodes definitely involved exhumation because by then the palaeogeothermal gradient had declined to a value close to the assumed present value of 30 8C km1, which agrees with estimates from offshore wells. The most recent cooling episode corresponds to the incision of the present-day relief (c. 1100 m) below the summits around the two boreholes. We conclude that the present-day high mountains of West Greenland were not uplifted during the Palaeogene, but are erosional remnants of a landmass uplifted during the Neogene. |
author2 |
The Pennsylvania State University CiteSeerX Archives |
format |
Text |
author |
Peter Japsen Paul F. Green James A. Chalmers |
author_facet |
Peter Japsen Paul F. Green James A. Chalmers |
author_sort |
Peter Japsen |
title |
Separation of Palaeogene and Neogene uplift on Nuussuaq, West Greenland |
title_short |
Separation of Palaeogene and Neogene uplift on Nuussuaq, West Greenland |
title_full |
Separation of Palaeogene and Neogene uplift on Nuussuaq, West Greenland |
title_fullStr |
Separation of Palaeogene and Neogene uplift on Nuussuaq, West Greenland |
title_full_unstemmed |
Separation of Palaeogene and Neogene uplift on Nuussuaq, West Greenland |
title_sort |
separation of palaeogene and neogene uplift on nuussuaq, west greenland |
url |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.496.3685 http://www.geus.dk/publications/extern/jour-geo-soc-lon-162-2005.pdf |
long_lat |
ENVELOPE(-51.918,-51.918,66.626,66.626) |
geographic |
Greenland Nuussuaq |
geographic_facet |
Greenland Nuussuaq |
genre |
Greenland Iceland Nuussuaq |
genre_facet |
Greenland Iceland Nuussuaq |
op_source |
http://www.geus.dk/publications/extern/jour-geo-soc-lon-162-2005.pdf |
op_relation |
http://citeseerx.ist.psu.edu/viewdoc/summary?doi=10.1.1.496.3685 http://www.geus.dk/publications/extern/jour-geo-soc-lon-162-2005.pdf |
op_rights |
Metadata may be used without restrictions as long as the oai identifier remains attached to it. |
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1766015393024966656 |