Dronning Maud Land Jurassic volcanism: volcanology and petrology
The Jurassic igneous rocks of Dronning Maud Land represent Karoo flood basalt magmatism in Antarctica. Fifty years of research has documented systematic differences between magmas associated with the Karoo rift-zone (Vestfjella and Ahlmannryggen) and the rift-shoulder (Sembberget, Kirwanveggen) sett...
Main Author: | |
---|---|
Format: | Article in Journal/Newspaper |
Language: | unknown |
Published: |
Geological Society of London
2021
|
Subjects: | |
Online Access: | https://dx.doi.org/10.6084/m9.figshare.c.5196613.v2 https://geolsoc.figshare.com/collections/Dronning_Maud_Land_Jurassic_volcanism_volcanology_and_petrology/5196613/2 |
id |
ftdatacite:10.6084/m9.figshare.c.5196613.v2 |
---|---|
record_format |
openpolar |
spelling |
ftdatacite:10.6084/m9.figshare.c.5196613.v2 2023-05-15T13:44:20+02:00 Dronning Maud Land Jurassic volcanism: volcanology and petrology Luttinen, Arto V. 2021 https://dx.doi.org/10.6084/m9.figshare.c.5196613.v2 https://geolsoc.figshare.com/collections/Dronning_Maud_Land_Jurassic_volcanism_volcanology_and_petrology/5196613/2 unknown Geological Society of London https://dx.doi.org/10.1144/m55-2018-89 https://dx.doi.org/10.6084/m9.figshare.c.5196613 Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 CC-BY Geology FOS Earth and related environmental sciences Collection article 2021 ftdatacite https://doi.org/10.6084/m9.figshare.c.5196613.v2 https://doi.org/10.1144/m55-2018-89 https://doi.org/10.6084/m9.figshare.c.5196613 2021-11-05T12:55:41Z The Jurassic igneous rocks of Dronning Maud Land represent Karoo flood basalt magmatism in Antarctica. Fifty years of research has documented systematic differences between magmas associated with the Karoo rift-zone (Vestfjella and Ahlmannryggen) and the rift-shoulder (Sembberget, Kirwanveggen) settings. The 189–182 Ma rift-zone tholeiites were chemically diverse and mainly formed compound-braided flow fields which record several magnetic polarity reversals. In contrast, the c . 181 Ma rift-shoulder tholeiites were chemically uniform and formed thick tabular sheet lavas within a single normal polarity period. The volcanic architecture records a long initial phase of slow eruptions from shield volcanoes in the initial rift and a brief phase of voluminous fissure eruptions flooding the rift shoulder. All of the major magma types in the rift-zone and rift-shoulder settings belong to a Nb-depleted category of Karoo flood basalts and were mainly derived from depleted convective upper mantle by magmatic differentiation. Pyroxenite-rich mantle components may have been significant sources for the most enriched magma types. Geochemical fingerprints of recycled crustal material imply that the Nb-depleted Karoo tholeiites may have been derived from mildly subduction-modified parts of the same overall upper-mantle reservoir which has been associated with the Ferrar tholeiites. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land DataCite Metadata Store (German National Library of Science and Technology) Dronning Maud Land Vestfjella ENVELOPE(-14.000,-14.000,-73.167,-73.167) Ahlmannryggen ENVELOPE(-2.500,-2.500,-71.833,-71.833) Kirwanveggen ENVELOPE(-3.500,-3.500,-73.500,-73.500) Sembberget ENVELOPE(-8.200,-8.200,-74.483,-74.483) |
institution |
Open Polar |
collection |
DataCite Metadata Store (German National Library of Science and Technology) |
op_collection_id |
ftdatacite |
language |
unknown |
topic |
Geology FOS Earth and related environmental sciences |
spellingShingle |
Geology FOS Earth and related environmental sciences Luttinen, Arto V. Dronning Maud Land Jurassic volcanism: volcanology and petrology |
topic_facet |
Geology FOS Earth and related environmental sciences |
description |
The Jurassic igneous rocks of Dronning Maud Land represent Karoo flood basalt magmatism in Antarctica. Fifty years of research has documented systematic differences between magmas associated with the Karoo rift-zone (Vestfjella and Ahlmannryggen) and the rift-shoulder (Sembberget, Kirwanveggen) settings. The 189–182 Ma rift-zone tholeiites were chemically diverse and mainly formed compound-braided flow fields which record several magnetic polarity reversals. In contrast, the c . 181 Ma rift-shoulder tholeiites were chemically uniform and formed thick tabular sheet lavas within a single normal polarity period. The volcanic architecture records a long initial phase of slow eruptions from shield volcanoes in the initial rift and a brief phase of voluminous fissure eruptions flooding the rift shoulder. All of the major magma types in the rift-zone and rift-shoulder settings belong to a Nb-depleted category of Karoo flood basalts and were mainly derived from depleted convective upper mantle by magmatic differentiation. Pyroxenite-rich mantle components may have been significant sources for the most enriched magma types. Geochemical fingerprints of recycled crustal material imply that the Nb-depleted Karoo tholeiites may have been derived from mildly subduction-modified parts of the same overall upper-mantle reservoir which has been associated with the Ferrar tholeiites. |
format |
Article in Journal/Newspaper |
author |
Luttinen, Arto V. |
author_facet |
Luttinen, Arto V. |
author_sort |
Luttinen, Arto V. |
title |
Dronning Maud Land Jurassic volcanism: volcanology and petrology |
title_short |
Dronning Maud Land Jurassic volcanism: volcanology and petrology |
title_full |
Dronning Maud Land Jurassic volcanism: volcanology and petrology |
title_fullStr |
Dronning Maud Land Jurassic volcanism: volcanology and petrology |
title_full_unstemmed |
Dronning Maud Land Jurassic volcanism: volcanology and petrology |
title_sort |
dronning maud land jurassic volcanism: volcanology and petrology |
publisher |
Geological Society of London |
publishDate |
2021 |
url |
https://dx.doi.org/10.6084/m9.figshare.c.5196613.v2 https://geolsoc.figshare.com/collections/Dronning_Maud_Land_Jurassic_volcanism_volcanology_and_petrology/5196613/2 |
long_lat |
ENVELOPE(-14.000,-14.000,-73.167,-73.167) ENVELOPE(-2.500,-2.500,-71.833,-71.833) ENVELOPE(-3.500,-3.500,-73.500,-73.500) ENVELOPE(-8.200,-8.200,-74.483,-74.483) |
geographic |
Dronning Maud Land Vestfjella Ahlmannryggen Kirwanveggen Sembberget |
geographic_facet |
Dronning Maud Land Vestfjella Ahlmannryggen Kirwanveggen Sembberget |
genre |
Antarc* Antarctica Dronning Maud Land |
genre_facet |
Antarc* Antarctica Dronning Maud Land |
op_relation |
https://dx.doi.org/10.1144/m55-2018-89 https://dx.doi.org/10.6084/m9.figshare.c.5196613 |
op_rights |
Creative Commons Attribution 4.0 International https://creativecommons.org/licenses/by/4.0/legalcode cc-by-4.0 |
op_rightsnorm |
CC-BY |
op_doi |
https://doi.org/10.6084/m9.figshare.c.5196613.v2 https://doi.org/10.1144/m55-2018-89 https://doi.org/10.6084/m9.figshare.c.5196613 |
_version_ |
1766200322063073280 |