Base-up growth of ocean crust by multiple phases of magmatism: field evidence from Macquarie Island
Macquarie Island preserves largely in-situ Miocene oceanic crust and mantle formed at a slow-spreading ridge. The crustal section on the island does not conform to a simple 'layer cake pseudo-stratigraphy', but is the result of multiple magmatic episodes. Macquarie Island crust did not gro...
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Online Access: | https://risweb.st-andrews.ac.uk/portal/en/researchoutput/baseup-growth-of-ocean-crust-by-multiple-phases-of-magmatism-field-evidence-from-macquarie-island(fb6062aa-23ca-49df-a44d-496a314c63d9).html http://www.scopus.com/inward/record.url?scp=4344604844&partnerID=8YFLogxK |
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ftunstandrewcris:oai:risweb.st-andrews.ac.uk:publications/fb6062aa-23ca-49df-a44d-496a314c63d9 2023-05-15T17:09:46+02:00 Base-up growth of ocean crust by multiple phases of magmatism: field evidence from Macquarie Island Dijkstra, A H Cawood, Peter Anthony 2004-09 https://risweb.st-andrews.ac.uk/portal/en/researchoutput/baseup-growth-of-ocean-crust-by-multiple-phases-of-magmatism-field-evidence-from-macquarie-island(fb6062aa-23ca-49df-a44d-496a314c63d9).html http://www.scopus.com/inward/record.url?scp=4344604844&partnerID=8YFLogxK eng eng info:eu-repo/semantics/restrictedAccess Dijkstra , A H & Cawood , P A 2004 , ' Base-up growth of ocean crust by multiple phases of magmatism: field evidence from Macquarie Island ' , Journal of the Geological Society , vol. 161 , pp. 739-742 . Macquarie Island ophiolites mid-ocean ridges sheeted dykes oceanic lithosphere SW PACIFIC SEA-FLOOR BOUNDARY RIDGES OPHIOLITE EVOLUTION article 2004 ftunstandrewcris 2021-12-26T14:17:48Z Macquarie Island preserves largely in-situ Miocene oceanic crust and mantle formed at a slow-spreading ridge. The crustal section on the island does not conform to a simple 'layer cake pseudo-stratigraphy', but is the result of multiple magmatic episodes. Macquarie Island crust did not grow by top-down cooling, but rather from the base up. Peridotites cooled first and formed the basement into which gabbro plutons were intruded. This was followed by cooling and deformation, and by intrusion of dykes that fed a sheeted dyke-basalt complex. Finally, lava-filled grabens were formed. These relative age relations rule out simple cogenetic relations between rock units. Article in Journal/Newspaper Macquarie Island University of St Andrews: Research Portal Pacific |
institution |
Open Polar |
collection |
University of St Andrews: Research Portal |
op_collection_id |
ftunstandrewcris |
language |
English |
topic |
Macquarie Island ophiolites mid-ocean ridges sheeted dykes oceanic lithosphere SW PACIFIC SEA-FLOOR BOUNDARY RIDGES OPHIOLITE EVOLUTION |
spellingShingle |
Macquarie Island ophiolites mid-ocean ridges sheeted dykes oceanic lithosphere SW PACIFIC SEA-FLOOR BOUNDARY RIDGES OPHIOLITE EVOLUTION Dijkstra, A H Cawood, Peter Anthony Base-up growth of ocean crust by multiple phases of magmatism: field evidence from Macquarie Island |
topic_facet |
Macquarie Island ophiolites mid-ocean ridges sheeted dykes oceanic lithosphere SW PACIFIC SEA-FLOOR BOUNDARY RIDGES OPHIOLITE EVOLUTION |
description |
Macquarie Island preserves largely in-situ Miocene oceanic crust and mantle formed at a slow-spreading ridge. The crustal section on the island does not conform to a simple 'layer cake pseudo-stratigraphy', but is the result of multiple magmatic episodes. Macquarie Island crust did not grow by top-down cooling, but rather from the base up. Peridotites cooled first and formed the basement into which gabbro plutons were intruded. This was followed by cooling and deformation, and by intrusion of dykes that fed a sheeted dyke-basalt complex. Finally, lava-filled grabens were formed. These relative age relations rule out simple cogenetic relations between rock units. |
format |
Article in Journal/Newspaper |
author |
Dijkstra, A H Cawood, Peter Anthony |
author_facet |
Dijkstra, A H Cawood, Peter Anthony |
author_sort |
Dijkstra, A H |
title |
Base-up growth of ocean crust by multiple phases of magmatism: field evidence from Macquarie Island |
title_short |
Base-up growth of ocean crust by multiple phases of magmatism: field evidence from Macquarie Island |
title_full |
Base-up growth of ocean crust by multiple phases of magmatism: field evidence from Macquarie Island |
title_fullStr |
Base-up growth of ocean crust by multiple phases of magmatism: field evidence from Macquarie Island |
title_full_unstemmed |
Base-up growth of ocean crust by multiple phases of magmatism: field evidence from Macquarie Island |
title_sort |
base-up growth of ocean crust by multiple phases of magmatism: field evidence from macquarie island |
publishDate |
2004 |
url |
https://risweb.st-andrews.ac.uk/portal/en/researchoutput/baseup-growth-of-ocean-crust-by-multiple-phases-of-magmatism-field-evidence-from-macquarie-island(fb6062aa-23ca-49df-a44d-496a314c63d9).html http://www.scopus.com/inward/record.url?scp=4344604844&partnerID=8YFLogxK |
geographic |
Pacific |
geographic_facet |
Pacific |
genre |
Macquarie Island |
genre_facet |
Macquarie Island |
op_source |
Dijkstra , A H & Cawood , P A 2004 , ' Base-up growth of ocean crust by multiple phases of magmatism: field evidence from Macquarie Island ' , Journal of the Geological Society , vol. 161 , pp. 739-742 . |
op_rights |
info:eu-repo/semantics/restrictedAccess |
_version_ |
1766065954103492608 |