Crustal Structure of the Iceland Region from Spectrally Correlated Free-air and Terrain Gravity Data
Seismic refraction studies have provided critical, but spatially restricted constraints on the structure of the Icelandic crust. To obtain a more comprehensive regional view of this tectonically complicated area, we spectrally correlated free-air gravity anomalies against computed gravity effects of...
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ftnasantrs:oai:casi.ntrs.nasa.gov:20030025279 2023-05-15T16:27:52+02:00 Crustal Structure of the Iceland Region from Spectrally Correlated Free-air and Terrain Gravity Data Roman, D. R. vonFrese, R. R. R. B. Potts, L. V. Taylor, Patrick T. Leftwich, T. E. Unclassified, Unlimited, Publicly available [2003] application/pdf http://hdl.handle.net/2060/20030025279 unknown Document ID: 20030025279 http://hdl.handle.net/2060/20030025279 Copyright, Distribution as joint owner in the copyright CASI Geophysics The Symposium on the Icelandic Plume and Crust; Unknown 2003 ftnasantrs 2019-07-21T07:46:35Z Seismic refraction studies have provided critical, but spatially restricted constraints on the structure of the Icelandic crust. To obtain a more comprehensive regional view of this tectonically complicated area, we spectrally correlated free-air gravity anomalies against computed gravity effects of the terrain for a crustal thickness model that also conforms to regional seismic and thermal constraints. Our regional crustal thickness estimates suggest thickened crust extends up to 500 km on either side of the Greenland-Scotland Ridge with the Iceland-Faeroe Ridge crust being less extended and on average 3-5 km thinner than the crust of the Greenland-Iceland Ridge. Crustal thickness estimates for Iceland range from 25-35 km in conformity with seismic predictions of a cooler, thicker crust. However, the deepening of our gravity-inferred Moho relative to seismic estimates at the thermal plume and rift zones of Iceland suggests partial melting. The amount of partial melting may range from about 8% beneath the rift zones to perhaps 20% above the plume core where mantle temperatures may be 200-400 C above normal. Beneath Iceland, areally limited regions of partial melting may also be compositionally and mechanically layered Other/Unknown Material Greenland Greenland-Scotland Ridge Iceland NASA Technical Reports Server (NTRS) Greenland |
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NASA Technical Reports Server (NTRS) |
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unknown |
topic |
Geophysics |
spellingShingle |
Geophysics Roman, D. R. vonFrese, R. R. R. B. Potts, L. V. Taylor, Patrick T. Leftwich, T. E. Crustal Structure of the Iceland Region from Spectrally Correlated Free-air and Terrain Gravity Data |
topic_facet |
Geophysics |
description |
Seismic refraction studies have provided critical, but spatially restricted constraints on the structure of the Icelandic crust. To obtain a more comprehensive regional view of this tectonically complicated area, we spectrally correlated free-air gravity anomalies against computed gravity effects of the terrain for a crustal thickness model that also conforms to regional seismic and thermal constraints. Our regional crustal thickness estimates suggest thickened crust extends up to 500 km on either side of the Greenland-Scotland Ridge with the Iceland-Faeroe Ridge crust being less extended and on average 3-5 km thinner than the crust of the Greenland-Iceland Ridge. Crustal thickness estimates for Iceland range from 25-35 km in conformity with seismic predictions of a cooler, thicker crust. However, the deepening of our gravity-inferred Moho relative to seismic estimates at the thermal plume and rift zones of Iceland suggests partial melting. The amount of partial melting may range from about 8% beneath the rift zones to perhaps 20% above the plume core where mantle temperatures may be 200-400 C above normal. Beneath Iceland, areally limited regions of partial melting may also be compositionally and mechanically layered |
format |
Other/Unknown Material |
author |
Roman, D. R. vonFrese, R. R. R. B. Potts, L. V. Taylor, Patrick T. Leftwich, T. E. |
author_facet |
Roman, D. R. vonFrese, R. R. R. B. Potts, L. V. Taylor, Patrick T. Leftwich, T. E. |
author_sort |
Roman, D. R. |
title |
Crustal Structure of the Iceland Region from Spectrally Correlated Free-air and Terrain Gravity Data |
title_short |
Crustal Structure of the Iceland Region from Spectrally Correlated Free-air and Terrain Gravity Data |
title_full |
Crustal Structure of the Iceland Region from Spectrally Correlated Free-air and Terrain Gravity Data |
title_fullStr |
Crustal Structure of the Iceland Region from Spectrally Correlated Free-air and Terrain Gravity Data |
title_full_unstemmed |
Crustal Structure of the Iceland Region from Spectrally Correlated Free-air and Terrain Gravity Data |
title_sort |
crustal structure of the iceland region from spectrally correlated free-air and terrain gravity data |
publishDate |
2003 |
url |
http://hdl.handle.net/2060/20030025279 |
op_coverage |
Unclassified, Unlimited, Publicly available |
geographic |
Greenland |
geographic_facet |
Greenland |
genre |
Greenland Greenland-Scotland Ridge Iceland |
genre_facet |
Greenland Greenland-Scotland Ridge Iceland |
op_source |
CASI |
op_relation |
Document ID: 20030025279 http://hdl.handle.net/2060/20030025279 |
op_rights |
Copyright, Distribution as joint owner in the copyright |
_version_ |
1766017432686690304 |