Macquarie Island: A window into the oceanic crust and upper mantle
Because of the inaccessibility of the deep-ocean floor, our knowledge about the composition and structure of the oceanic crust is very limited. Macquarie Island is the only fragment of ocean crust exposed above sea-level in the world, providing a unique opportunity to study the ocean crust directly...
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ftands:oai:ands.org.au::699574 2023-05-15T17:09:50+02:00 Macquarie Island: A window into the oceanic crust and upper mantle CAWOOD, PETER (hasPrincipalInvestigator) CAWOOD, PETER (processor) Australian Antarctic Data Centre (publisher) Spatial: northlimit=-54.0; southlimit=-54.0; westlimit=158.0; eastLimit=159.0; projection=WGS84 Temporal: From 2002-10-21 to 2003-03-28 https://researchdata.ands.org.au/macquarie-island-window-upper-mantle/699574 https://data.aad.gov.au/metadata/records/ASAC_1208 http://nla.gov.au/nla.party-617536 unknown Australian Antarctic Data Centre https://researchdata.ands.org.au/macquarie-island-window-upper-mantle/699574 1aa43f20-4560-4f51-877c-69c65a7397ab ASAC_1208 https://data.aad.gov.au/metadata/records/ASAC_1208 http://nla.gov.au/nla.party-617536 Australian Antarctic Data Centre geoscientificInformation oceans OCEAN CRUST DEFORMATION EARTH SCIENCE SOLID EARTH GRAVITY/GRAVITATIONAL FIELD CRUSTAL MOTION MACQUARIE ISLAND MID-OCEAN RIDGES OCEANIC LITHOSPHERE OPHIOLITES SHEETED DYKES OCEAN > SOUTHERN OCEAN SOUTHERN OCEAN > GEOGRAPHIC REGION > POLAR dataset ftands 2020-01-05T21:16:27Z Because of the inaccessibility of the deep-ocean floor, our knowledge about the composition and structure of the oceanic crust is very limited. Macquarie Island is the only fragment of ocean crust exposed above sea-level in the world, providing a unique opportunity to study the ocean crust directly in unprecedented detail. From the abstract of the referenced paper: 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 co-genetic relations between rock units. Dataset Macquarie Island Southern Ocean Research Data Australia (Australian National Data Service - ANDS) Southern Ocean ENVELOPE(158.0,159.0,-54.0,-54.0) |
institution |
Open Polar |
collection |
Research Data Australia (Australian National Data Service - ANDS) |
op_collection_id |
ftands |
language |
unknown |
topic |
geoscientificInformation oceans OCEAN CRUST DEFORMATION EARTH SCIENCE SOLID EARTH GRAVITY/GRAVITATIONAL FIELD CRUSTAL MOTION MACQUARIE ISLAND MID-OCEAN RIDGES OCEANIC LITHOSPHERE OPHIOLITES SHEETED DYKES OCEAN > SOUTHERN OCEAN SOUTHERN OCEAN > GEOGRAPHIC REGION > POLAR |
spellingShingle |
geoscientificInformation oceans OCEAN CRUST DEFORMATION EARTH SCIENCE SOLID EARTH GRAVITY/GRAVITATIONAL FIELD CRUSTAL MOTION MACQUARIE ISLAND MID-OCEAN RIDGES OCEANIC LITHOSPHERE OPHIOLITES SHEETED DYKES OCEAN > SOUTHERN OCEAN SOUTHERN OCEAN > GEOGRAPHIC REGION > POLAR Macquarie Island: A window into the oceanic crust and upper mantle |
topic_facet |
geoscientificInformation oceans OCEAN CRUST DEFORMATION EARTH SCIENCE SOLID EARTH GRAVITY/GRAVITATIONAL FIELD CRUSTAL MOTION MACQUARIE ISLAND MID-OCEAN RIDGES OCEANIC LITHOSPHERE OPHIOLITES SHEETED DYKES OCEAN > SOUTHERN OCEAN SOUTHERN OCEAN > GEOGRAPHIC REGION > POLAR |
description |
Because of the inaccessibility of the deep-ocean floor, our knowledge about the composition and structure of the oceanic crust is very limited. Macquarie Island is the only fragment of ocean crust exposed above sea-level in the world, providing a unique opportunity to study the ocean crust directly in unprecedented detail. From the abstract of the referenced paper: 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 co-genetic relations between rock units. |
author2 |
CAWOOD, PETER (hasPrincipalInvestigator) CAWOOD, PETER (processor) Australian Antarctic Data Centre (publisher) |
format |
Dataset |
title |
Macquarie Island: A window into the oceanic crust and upper mantle |
title_short |
Macquarie Island: A window into the oceanic crust and upper mantle |
title_full |
Macquarie Island: A window into the oceanic crust and upper mantle |
title_fullStr |
Macquarie Island: A window into the oceanic crust and upper mantle |
title_full_unstemmed |
Macquarie Island: A window into the oceanic crust and upper mantle |
title_sort |
macquarie island: a window into the oceanic crust and upper mantle |
publisher |
Australian Antarctic Data Centre |
url |
https://researchdata.ands.org.au/macquarie-island-window-upper-mantle/699574 https://data.aad.gov.au/metadata/records/ASAC_1208 http://nla.gov.au/nla.party-617536 |
op_coverage |
Spatial: northlimit=-54.0; southlimit=-54.0; westlimit=158.0; eastLimit=159.0; projection=WGS84 Temporal: From 2002-10-21 to 2003-03-28 |
long_lat |
ENVELOPE(158.0,159.0,-54.0,-54.0) |
geographic |
Southern Ocean |
geographic_facet |
Southern Ocean |
genre |
Macquarie Island Southern Ocean |
genre_facet |
Macquarie Island Southern Ocean |
op_source |
Australian Antarctic Data Centre |
op_relation |
https://researchdata.ands.org.au/macquarie-island-window-upper-mantle/699574 1aa43f20-4560-4f51-877c-69c65a7397ab ASAC_1208 https://data.aad.gov.au/metadata/records/ASAC_1208 http://nla.gov.au/nla.party-617536 |
_version_ |
1766066191760097280 |