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...
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Language: | English |
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2005
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Online Access: | https://eprints.soton.ac.uk/17443/ https://eprints.soton.ac.uk/17443/1/gji_sept05_ms_final.pdf |
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ftsouthampton:oai:eprints.soton.ac.uk:17443 2023-07-30T04:04:22+02:00 Temporal and spatial cyclicity of accretion at slow-spreading ridges: evidence from the Reykjanes Ridge Peirce, C. Gardiner, A. Sinha, M. 2005 text https://eprints.soton.ac.uk/17443/ https://eprints.soton.ac.uk/17443/1/gji_sept05_ms_final.pdf en eng https://eprints.soton.ac.uk/17443/1/gji_sept05_ms_final.pdf Peirce, C., Gardiner, A. and Sinha, M. (2005) Temporal and spatial cyclicity of accretion at slow-spreading ridges: evidence from the Reykjanes Ridge. Geophysical Journal International, 163 (1), 56-78. (doi:10.1111/j.1365-246X.2005.02738.x <http://dx.doi.org/10.1111/j.1365-246X.2005.02738.x>). Article PeerReviewed 2005 ftsouthampton https://doi.org/10.1111/j.1365-246X.2005.02738.x 2023-07-09T20:34:21Z 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 University of Southampton: e-Prints Soton Mid-Atlantic Ridge Reykjanes ENVELOPE(-22.250,-22.250,65.467,65.467) Geophysical Journal International 163 1 56 78 |
institution |
Open Polar |
collection |
University of Southampton: e-Prints Soton |
op_collection_id |
ftsouthampton |
language |
English |
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. |
spellingShingle |
Peirce, C. Gardiner, A. Sinha, M. Temporal and spatial cyclicity of accretion at slow-spreading ridges: evidence from the Reykjanes Ridge |
author_facet |
Peirce, C. Gardiner, A. Sinha, M. |
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 |
publishDate |
2005 |
url |
https://eprints.soton.ac.uk/17443/ https://eprints.soton.ac.uk/17443/1/gji_sept05_ms_final.pdf |
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_relation |
https://eprints.soton.ac.uk/17443/1/gji_sept05_ms_final.pdf Peirce, C., Gardiner, A. and Sinha, M. (2005) Temporal and spatial cyclicity of accretion at slow-spreading ridges: evidence from the Reykjanes Ridge. Geophysical Journal International, 163 (1), 56-78. (doi:10.1111/j.1365-246X.2005.02738.x <http://dx.doi.org/10.1111/j.1365-246X.2005.02738.x>). |
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_ |
1772815766857449472 |