Temporal and spatial cyclicity of accretion at slow-spreading ridges—evidence from the Reykjanes Ridge.
A unifying model of oceanic crustal development at slow spreading rates is presented in which accretion follows a cyclic pattern of magmatic construction and tectonic destruction, controlled by along-axis variation in melt supply and coupled to along-axis variation in spreading rate and across-axis...
Published in: | Geophysical Journal International |
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2005
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Online Access: | http://dro.dur.ac.uk/2154/ http://dro.dur.ac.uk/2154/1/2154.pdf https://doi.org/10.1111/j.1365-246X.2005.02738.x |
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ftunivdurham:oai:dro.dur.ac.uk.OAI2:2154 2023-05-15T16:48:34+02:00 Temporal and spatial cyclicity of accretion at slow-spreading ridges—evidence from the Reykjanes Ridge. Peirce, C. Gardiner, A. Sinha, M. C. 2005-10 application/pdf http://dro.dur.ac.uk/2154/ http://dro.dur.ac.uk/2154/1/2154.pdf https://doi.org/10.1111/j.1365-246X.2005.02738.x unknown Blackwell dro:2154 issn:0956-540X issn: 1365-246X doi:10.1111/j.1365-246X.2005.02738.x http://dro.dur.ac.uk/2154/ http://dx.doi.org/10.1111/j.1365-246X.2005.02738.x http://dro.dur.ac.uk/2154/1/2154.pdf The definitive version is available at onlinelibrary.wiley.com. Geophysical journal international, 2005, Vol.163(1), pp.56-78 [Peer Reviewed Journal] Crustal accretion Crustal structure Gravity anomalies Mid-ocean ridges Oceanic crust Residual mantle Bouguer anomaly Article PeerReviewed 2005 ftunivdurham https://doi.org/10.1111/j.1365-246X.2005.02738.x 2020-05-28T22:25:43Z A unifying model of oceanic crustal development at slow spreading rates is presented in which accretion follows a cyclic pattern of magmatic construction and tectonic destruction, controlled by along-axis variation in melt supply and coupled to along-axis variation in spreading rate and across-axis asymmetry in spreading. This study focuses on the Reykjanes Ridge, Mid-Atlantic Ridge south of Iceland, which is divided along its entire length into numerous axial volcanic ridges (AVR). Five adjacent AVRs have been analysed, located between 57°30'N and 58°30'N and south of any strong Iceland hotspot influence. The seabed morphology of each AVR is investigated using sidescan sonar data to determine relative age and eruptive history. Along-axis gravity profiles for each AVR are modelled relative to a seismically derived crustal reference model, to reveal the underlying crustal thickness and density structure. Correlating these models with seabed features, crustal structure, ridge segment morphology and relative ages, a model of cyclic ridge segmentation is developed in which accretion results in adjacent AVRs with a range of crustal features which, when viewed collectively, reveal that second-order segments on the Reykjanes Ridge have an along-axis length of 70 km and comprise several adjacent AVRs which, in turn, reflect the pattern of third-order segmentation. Tectono-magmatic accretion is shown to operate on the scale of individual AVRs, as well as on the scale of the second-order segment as a whole. Article in Journal/Newspaper Iceland Durham University: Durham Research Online Mid-Atlantic Ridge Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Geophysical Journal International 163 1 56 78 |
institution |
Open Polar |
collection |
Durham University: Durham Research Online |
op_collection_id |
ftunivdurham |
language |
unknown |
topic |
Crustal accretion Crustal structure Gravity anomalies Mid-ocean ridges Oceanic crust Residual mantle Bouguer anomaly |
spellingShingle |
Crustal accretion Crustal structure Gravity anomalies Mid-ocean ridges Oceanic crust Residual mantle Bouguer anomaly Peirce, C. Gardiner, A. Sinha, M. C. Temporal and spatial cyclicity of accretion at slow-spreading ridges—evidence from the Reykjanes Ridge. |
topic_facet |
Crustal accretion Crustal structure Gravity anomalies Mid-ocean ridges Oceanic crust Residual mantle Bouguer anomaly |
description |
A unifying model of oceanic crustal development at slow spreading rates is presented in which accretion follows a cyclic pattern of magmatic construction and tectonic destruction, controlled by along-axis variation in melt supply and coupled to along-axis variation in spreading rate and across-axis asymmetry in spreading. This study focuses on the Reykjanes Ridge, Mid-Atlantic Ridge south of Iceland, which is divided along its entire length into numerous axial volcanic ridges (AVR). Five adjacent AVRs have been analysed, located between 57°30'N and 58°30'N and south of any strong Iceland hotspot influence. The seabed morphology of each AVR is investigated using sidescan sonar data to determine relative age and eruptive history. Along-axis gravity profiles for each AVR are modelled relative to a seismically derived crustal reference model, to reveal the underlying crustal thickness and density structure. Correlating these models with seabed features, crustal structure, ridge segment morphology and relative ages, a model of cyclic ridge segmentation is developed in which accretion results in adjacent AVRs with a range of crustal features which, when viewed collectively, reveal that second-order segments on the Reykjanes Ridge have an along-axis length of 70 km and comprise several adjacent AVRs which, in turn, reflect the pattern of third-order segmentation. Tectono-magmatic accretion is shown to operate on the scale of individual AVRs, as well as on the scale of the second-order segment as a whole. |
format |
Article in Journal/Newspaper |
author |
Peirce, C. Gardiner, A. Sinha, M. C. |
author_facet |
Peirce, C. Gardiner, A. Sinha, M. C. |
author_sort |
Peirce, C. |
title |
Temporal and spatial cyclicity of accretion at slow-spreading ridges—evidence from the Reykjanes Ridge. |
title_short |
Temporal and spatial cyclicity of accretion at slow-spreading ridges—evidence from the Reykjanes Ridge. |
title_full |
Temporal and spatial cyclicity of accretion at slow-spreading ridges—evidence from the Reykjanes Ridge. |
title_fullStr |
Temporal and spatial cyclicity of accretion at slow-spreading ridges—evidence from the Reykjanes Ridge. |
title_full_unstemmed |
Temporal and spatial cyclicity of accretion at slow-spreading ridges—evidence from the Reykjanes Ridge. |
title_sort |
temporal and spatial cyclicity of accretion at slow-spreading ridges—evidence from the reykjanes ridge. |
publisher |
Blackwell |
publishDate |
2005 |
url |
http://dro.dur.ac.uk/2154/ http://dro.dur.ac.uk/2154/1/2154.pdf https://doi.org/10.1111/j.1365-246X.2005.02738.x |
long_lat |
ENVELOPE(-22.250,-22.250,65.467,65.467) |
geographic |
Mid-Atlantic Ridge Reykjanes |
geographic_facet |
Mid-Atlantic Ridge Reykjanes |
genre |
Iceland |
genre_facet |
Iceland |
op_source |
Geophysical journal international, 2005, Vol.163(1), pp.56-78 [Peer Reviewed Journal] |
op_relation |
dro:2154 issn:0956-540X issn: 1365-246X doi:10.1111/j.1365-246X.2005.02738.x http://dro.dur.ac.uk/2154/ http://dx.doi.org/10.1111/j.1365-246X.2005.02738.x http://dro.dur.ac.uk/2154/1/2154.pdf |
op_rights |
The definitive version is available at onlinelibrary.wiley.com. |
op_doi |
https://doi.org/10.1111/j.1365-246X.2005.02738.x |
container_title |
Geophysical Journal International |
container_volume |
163 |
container_issue |
1 |
container_start_page |
56 |
op_container_end_page |
78 |
_version_ |
1766038645895069696 |