Icelandic Tectonics—Graben or Horst ?
The younger rocks of Iceland (Pliocene to Present Day) occupy the broad median zone shown in Text-fig. I; the boundaries are only approximate in places, and information is lacking with regard to the eastern one particularly. Outside this zone early Tertiary basalts predominate but (I) the uppermost...
Published in: | Geological Magazine |
---|---|
Main Author: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
1941
|
Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0016756800072010 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800072010 |
id |
crcambridgeupr:10.1017/s0016756800072010 |
---|---|
record_format |
openpolar |
spelling |
crcambridgeupr:10.1017/s0016756800072010 2024-03-03T08:45:46+00:00 Icelandic Tectonics—Graben or Horst ? Hawkes, L. 1941 http://dx.doi.org/10.1017/s0016756800072010 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800072010 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Geological Magazine volume 78, issue 4, page 305-308 ISSN 0016-7568 1469-5081 Geology journal-article 1941 crcambridgeupr https://doi.org/10.1017/s0016756800072010 2024-02-08T08:29:05Z The younger rocks of Iceland (Pliocene to Present Day) occupy the broad median zone shown in Text-fig. I; the boundaries are only approximate in places, and information is lacking with regard to the eastern one particularly. Outside this zone early Tertiary basalts predominate but (I) the uppermost basalts are regarded by some authors as Quaternary, (2) Quaternary and Recent volcanic rocks occur in the Snaefells Peninsula and in Skagi. The thickness of the early Tertiary series has been estimated at 3,000 m.; it may well be more, and it is reasonable to suppose that originally these basalts extended over the site of the median zone. Hitherto all workers in Icelandic geology have considered the zone to be a graben where the older rocks have been faulted or tilted downwards, but recently R. A. Sonder (1, 2) has put forward the startling idea that it is a horst, a view which is discussed, and not unfavourably, by H. G. Backlund (3). Before considering this new conception attention will be drawn to evidence in the neighbourhood of the north-western boundary of the zone, evidence which is not mentioned by Sonder and which, although it has been known for over 70 years, is often ignored or forgotten by writers on Icelandic tectonics. Article in Journal/Newspaper Iceland Cambridge University Press Geological Magazine 78 4 305 308 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology |
spellingShingle |
Geology Hawkes, L. Icelandic Tectonics—Graben or Horst ? |
topic_facet |
Geology |
description |
The younger rocks of Iceland (Pliocene to Present Day) occupy the broad median zone shown in Text-fig. I; the boundaries are only approximate in places, and information is lacking with regard to the eastern one particularly. Outside this zone early Tertiary basalts predominate but (I) the uppermost basalts are regarded by some authors as Quaternary, (2) Quaternary and Recent volcanic rocks occur in the Snaefells Peninsula and in Skagi. The thickness of the early Tertiary series has been estimated at 3,000 m.; it may well be more, and it is reasonable to suppose that originally these basalts extended over the site of the median zone. Hitherto all workers in Icelandic geology have considered the zone to be a graben where the older rocks have been faulted or tilted downwards, but recently R. A. Sonder (1, 2) has put forward the startling idea that it is a horst, a view which is discussed, and not unfavourably, by H. G. Backlund (3). Before considering this new conception attention will be drawn to evidence in the neighbourhood of the north-western boundary of the zone, evidence which is not mentioned by Sonder and which, although it has been known for over 70 years, is often ignored or forgotten by writers on Icelandic tectonics. |
format |
Article in Journal/Newspaper |
author |
Hawkes, L. |
author_facet |
Hawkes, L. |
author_sort |
Hawkes, L. |
title |
Icelandic Tectonics—Graben or Horst ? |
title_short |
Icelandic Tectonics—Graben or Horst ? |
title_full |
Icelandic Tectonics—Graben or Horst ? |
title_fullStr |
Icelandic Tectonics—Graben or Horst ? |
title_full_unstemmed |
Icelandic Tectonics—Graben or Horst ? |
title_sort |
icelandic tectonics—graben or horst ? |
publisher |
Cambridge University Press (CUP) |
publishDate |
1941 |
url |
http://dx.doi.org/10.1017/s0016756800072010 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0016756800072010 |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Geological Magazine volume 78, issue 4, page 305-308 ISSN 0016-7568 1469-5081 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0016756800072010 |
container_title |
Geological Magazine |
container_volume |
78 |
container_issue |
4 |
container_start_page |
305 |
op_container_end_page |
308 |
_version_ |
1792501411949314048 |