The Hatton Bank continental margin--II. Deep structure from two-ship expanding spread seismic profiles
The continent-ocean transition adjacent to Hatton Bank was studied using a dense grid of single-ship and two-ship multichannel seismic profiles. The interpretation of the explosive expanding spread profiles (ESPs) which were shot as part of this survey are discussed here in detail. Extensive seaward...
Published in: | Geophysical Journal International |
---|---|
Main Authors: | , , , |
Format: | Text |
Language: | English |
Published: |
Oxford University Press
1989
|
Subjects: | |
Online Access: | http://gji.oxfordjournals.org/cgi/content/short/96/2/295 https://doi.org/10.1111/j.1365-246X.1989.tb04452.x |
id |
fthighwire:oai:open-archive.highwire.org:gji:96/2/295 |
---|---|
record_format |
openpolar |
spelling |
fthighwire:oai:open-archive.highwire.org:gji:96/2/295 2023-05-15T16:03:52+02:00 The Hatton Bank continental margin--II. Deep structure from two-ship expanding spread seismic profiles Fowler, S. R. White, R. S. Spence, G. D. Westbrook, G. K. 1989-02-01 00:00:00.0 text/html http://gji.oxfordjournals.org/cgi/content/short/96/2/295 https://doi.org/10.1111/j.1365-246X.1989.tb04452.x en eng Oxford University Press http://gji.oxfordjournals.org/cgi/content/short/96/2/295 http://dx.doi.org/10.1111/j.1365-246X.1989.tb04452.x Copyright (C) 1989, Oxford University Press Articles TEXT 1989 fthighwire https://doi.org/10.1111/j.1365-246X.1989.tb04452.x 2015-02-28T18:03:07Z The continent-ocean transition adjacent to Hatton Bank was studied using a dense grid of single-ship and two-ship multichannel seismic profiles. The interpretation of the explosive expanding spread profiles (ESPs) which were shot as part of this survey are discussed here in detail. Extensive seaward dipping reflectors are developed in the upper crust across the entire margin. These seaward dipping reflectors continue northwards on the Faeroes and Vøring margins, where they have been shown to be caused by basaltic lavas, as well as on the conjugate margin of East Greenland. The dipping reflectors are an important feature of the rifting history of the margin and show that extensive volcanism was associated with the extension. The ESPs show clear seismic arrivals out to ranges of 100 km. Wide-angle Moho reflections can be seen on all the lines as well as good mid and lower crustal arrivals. The determination of seismic velocity structure was constrained by ray tracing and by amplitude modelling using reflectivity synthetic seismograms. The results from the ESPs show that there is a thick region of lower crustal material beneath the margin with an unusually high crustal velocity of 7.3–7.4 km s−1. This lower crustal material reaches a maximum thickness of 14 km beneath the central part of the margin and is terminated at depth by the Moho. The lower crustal lens of high-velocity material is interpreted as underplated or intruded igneous rocks associated with the large volumes of extrusive basaltic lavas, now seen as dipping reflectors on the margin. Text East Greenland Greenland HighWire Press (Stanford University) Greenland Hatton Bank ENVELOPE(-18.000,-18.000,58.583,58.583) Geophysical Journal International 96 2 295 309 |
institution |
Open Polar |
collection |
HighWire Press (Stanford University) |
op_collection_id |
fthighwire |
language |
English |
topic |
Articles |
spellingShingle |
Articles Fowler, S. R. White, R. S. Spence, G. D. Westbrook, G. K. The Hatton Bank continental margin--II. Deep structure from two-ship expanding spread seismic profiles |
topic_facet |
Articles |
description |
The continent-ocean transition adjacent to Hatton Bank was studied using a dense grid of single-ship and two-ship multichannel seismic profiles. The interpretation of the explosive expanding spread profiles (ESPs) which were shot as part of this survey are discussed here in detail. Extensive seaward dipping reflectors are developed in the upper crust across the entire margin. These seaward dipping reflectors continue northwards on the Faeroes and Vøring margins, where they have been shown to be caused by basaltic lavas, as well as on the conjugate margin of East Greenland. The dipping reflectors are an important feature of the rifting history of the margin and show that extensive volcanism was associated with the extension. The ESPs show clear seismic arrivals out to ranges of 100 km. Wide-angle Moho reflections can be seen on all the lines as well as good mid and lower crustal arrivals. The determination of seismic velocity structure was constrained by ray tracing and by amplitude modelling using reflectivity synthetic seismograms. The results from the ESPs show that there is a thick region of lower crustal material beneath the margin with an unusually high crustal velocity of 7.3–7.4 km s−1. This lower crustal material reaches a maximum thickness of 14 km beneath the central part of the margin and is terminated at depth by the Moho. The lower crustal lens of high-velocity material is interpreted as underplated or intruded igneous rocks associated with the large volumes of extrusive basaltic lavas, now seen as dipping reflectors on the margin. |
format |
Text |
author |
Fowler, S. R. White, R. S. Spence, G. D. Westbrook, G. K. |
author_facet |
Fowler, S. R. White, R. S. Spence, G. D. Westbrook, G. K. |
author_sort |
Fowler, S. R. |
title |
The Hatton Bank continental margin--II. Deep structure from two-ship expanding spread seismic profiles |
title_short |
The Hatton Bank continental margin--II. Deep structure from two-ship expanding spread seismic profiles |
title_full |
The Hatton Bank continental margin--II. Deep structure from two-ship expanding spread seismic profiles |
title_fullStr |
The Hatton Bank continental margin--II. Deep structure from two-ship expanding spread seismic profiles |
title_full_unstemmed |
The Hatton Bank continental margin--II. Deep structure from two-ship expanding spread seismic profiles |
title_sort |
hatton bank continental margin--ii. deep structure from two-ship expanding spread seismic profiles |
publisher |
Oxford University Press |
publishDate |
1989 |
url |
http://gji.oxfordjournals.org/cgi/content/short/96/2/295 https://doi.org/10.1111/j.1365-246X.1989.tb04452.x |
long_lat |
ENVELOPE(-18.000,-18.000,58.583,58.583) |
geographic |
Greenland Hatton Bank |
geographic_facet |
Greenland Hatton Bank |
genre |
East Greenland Greenland |
genre_facet |
East Greenland Greenland |
op_relation |
http://gji.oxfordjournals.org/cgi/content/short/96/2/295 http://dx.doi.org/10.1111/j.1365-246X.1989.tb04452.x |
op_rights |
Copyright (C) 1989, Oxford University Press |
op_doi |
https://doi.org/10.1111/j.1365-246X.1989.tb04452.x |
container_title |
Geophysical Journal International |
container_volume |
96 |
container_issue |
2 |
container_start_page |
295 |
op_container_end_page |
309 |
_version_ |
1766399559767949312 |