Geochemistry of mafic dykes in the Antarctic Peninsula continental-margin batholith: a record of arc evolution
Mafic dykes of the Antarctic Peninsula continental-margin arc are compositionally diverse, comprising calc-alkaline (dominant), shoshonite, tholeiite, and OIB-like varieties. Their compositions give information about different mafic magma sources tapped during arc evolution. The compositional groups...
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ftnerc:oai:nora.nerc.ac.uk:504320 2023-05-15T13:48:08+02:00 Geochemistry of mafic dykes in the Antarctic Peninsula continental-margin batholith: a record of arc evolution Wareham, Christopher D. Millar, Ian L. Scarrow, Jane H. Leat, Philip T. 1998 http://nora.nerc.ac.uk/id/eprint/504320/ https://doi.org/10.1007/s004100050394 unknown Springer Wareham, Christopher D.; Millar, Ian L.; Scarrow, Jane H.; Leat, Philip T. 1998 Geochemistry of mafic dykes in the Antarctic Peninsula continental-margin batholith: a record of arc evolution. Contributions to Mineralogy and Petrology, 131 (2-3). 289-305. https://doi.org/10.1007/s004100050394 <https://doi.org/10.1007/s004100050394> Publication - Article PeerReviewed 1998 ftnerc https://doi.org/10.1007/s004100050394 2023-02-04T19:38:23Z Mafic dykes of the Antarctic Peninsula continental-margin arc are compositionally diverse, comprising calc-alkaline (dominant), shoshonite, tholeiite, and OIB-like varieties. Their compositions give information about different mafic magma sources tapped during arc evolution. The compositional groups represent partial melts of at least five distinct mantle sources: a low-ɛNd subduction-modified, garnet-bearing, lithospheric mantle (older calc-alkaline); a high-ɛNd subduction-modified, garnet-bearing, lithospheric mantle (shoshonites); a high-ɛNd subduction-modified, spinel-bearing, asthenospheric mantle (younger calc-alkaline); E-MORB-like spinel-bearing asthenosphere depleted by a previous melting event (tholeiites); and within-plate non-subduction modified, garnet- and spinel-bearing, asthenosphere (OIB-like). Slab-derived fluids, subducted sediment, and arc crust also contributed to the magmas. Consideration of previous work in the light of our new compositional and geochronological data enables presentation of a summary of arc evolution. For most of the Cretaceous and Tertiary, the tectonic regime of the Antarctic Peninsula arc was transtensional, and calc-alkaline magmas intruded. An oceanic spreading centre collided with the trench during the Late Cretaceous and induced tectonic changes which caused tapping of different magma sources. A pulse of shoshonitic, tholeiitic, and OIB-like mafic magmatism resulted. Three ridge-trench collisions are now recognized during the history of the arc, in Mid–Late Jurassic, Late Cretaceous, and Early–Mid Tertiary times. Article in Journal/Newspaper Antarc* Antarctic Antarctic Peninsula Natural Environment Research Council: NERC Open Research Archive Antarctic The Antarctic Antarctic Peninsula Contributions to Mineralogy and Petrology 131 2-3 289 305 |
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Open Polar |
collection |
Natural Environment Research Council: NERC Open Research Archive |
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ftnerc |
language |
unknown |
description |
Mafic dykes of the Antarctic Peninsula continental-margin arc are compositionally diverse, comprising calc-alkaline (dominant), shoshonite, tholeiite, and OIB-like varieties. Their compositions give information about different mafic magma sources tapped during arc evolution. The compositional groups represent partial melts of at least five distinct mantle sources: a low-ɛNd subduction-modified, garnet-bearing, lithospheric mantle (older calc-alkaline); a high-ɛNd subduction-modified, garnet-bearing, lithospheric mantle (shoshonites); a high-ɛNd subduction-modified, spinel-bearing, asthenospheric mantle (younger calc-alkaline); E-MORB-like spinel-bearing asthenosphere depleted by a previous melting event (tholeiites); and within-plate non-subduction modified, garnet- and spinel-bearing, asthenosphere (OIB-like). Slab-derived fluids, subducted sediment, and arc crust also contributed to the magmas. Consideration of previous work in the light of our new compositional and geochronological data enables presentation of a summary of arc evolution. For most of the Cretaceous and Tertiary, the tectonic regime of the Antarctic Peninsula arc was transtensional, and calc-alkaline magmas intruded. An oceanic spreading centre collided with the trench during the Late Cretaceous and induced tectonic changes which caused tapping of different magma sources. A pulse of shoshonitic, tholeiitic, and OIB-like mafic magmatism resulted. Three ridge-trench collisions are now recognized during the history of the arc, in Mid–Late Jurassic, Late Cretaceous, and Early–Mid Tertiary times. |
format |
Article in Journal/Newspaper |
author |
Wareham, Christopher D. Millar, Ian L. Scarrow, Jane H. Leat, Philip T. |
spellingShingle |
Wareham, Christopher D. Millar, Ian L. Scarrow, Jane H. Leat, Philip T. Geochemistry of mafic dykes in the Antarctic Peninsula continental-margin batholith: a record of arc evolution |
author_facet |
Wareham, Christopher D. Millar, Ian L. Scarrow, Jane H. Leat, Philip T. |
author_sort |
Wareham, Christopher D. |
title |
Geochemistry of mafic dykes in the Antarctic Peninsula continental-margin batholith: a record of arc evolution |
title_short |
Geochemistry of mafic dykes in the Antarctic Peninsula continental-margin batholith: a record of arc evolution |
title_full |
Geochemistry of mafic dykes in the Antarctic Peninsula continental-margin batholith: a record of arc evolution |
title_fullStr |
Geochemistry of mafic dykes in the Antarctic Peninsula continental-margin batholith: a record of arc evolution |
title_full_unstemmed |
Geochemistry of mafic dykes in the Antarctic Peninsula continental-margin batholith: a record of arc evolution |
title_sort |
geochemistry of mafic dykes in the antarctic peninsula continental-margin batholith: a record of arc evolution |
publisher |
Springer |
publishDate |
1998 |
url |
http://nora.nerc.ac.uk/id/eprint/504320/ https://doi.org/10.1007/s004100050394 |
geographic |
Antarctic The Antarctic Antarctic Peninsula |
geographic_facet |
Antarctic The Antarctic Antarctic Peninsula |
genre |
Antarc* Antarctic Antarctic Peninsula |
genre_facet |
Antarc* Antarctic Antarctic Peninsula |
op_relation |
Wareham, Christopher D.; Millar, Ian L.; Scarrow, Jane H.; Leat, Philip T. 1998 Geochemistry of mafic dykes in the Antarctic Peninsula continental-margin batholith: a record of arc evolution. Contributions to Mineralogy and Petrology, 131 (2-3). 289-305. https://doi.org/10.1007/s004100050394 <https://doi.org/10.1007/s004100050394> |
op_doi |
https://doi.org/10.1007/s004100050394 |
container_title |
Contributions to Mineralogy and Petrology |
container_volume |
131 |
container_issue |
2-3 |
container_start_page |
289 |
op_container_end_page |
305 |
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1766248730702381056 |