Mantle rocks in East Antarctica
Only three localities of mantle xenoliths are known from all of East Antarctica, occurring at the Jetty Peninsula (LambertAmery Rift), Vestfold Hills and Gaussberg volcano. The latter two are spinel-facies peridotites, whereas the Jetty Peninsula rocks also include garnet-spinel lherzolites; all com...
Published in: | Geological Society, London, Memoirs |
---|---|
Main Authors: | , , , , |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Geological Society of London
2021
|
Subjects: | |
Online Access: | https://doi.org/10.1144/M56-2020-8 http://ecite.utas.edu.au/149185 |
id |
ftunivtasecite:oai:ecite.utas.edu.au:149185 |
---|---|
record_format |
openpolar |
spelling |
ftunivtasecite:oai:ecite.utas.edu.au:149185 2023-05-15T13:59:47+02:00 Mantle rocks in East Antarctica Foley, SF Andronikov, AV Halpin, JA Daczko, NR Jacob, DE 2021 https://doi.org/10.1144/M56-2020-8 http://ecite.utas.edu.au/149185 en eng Geological Society of London http://dx.doi.org/10.1144/M56-2020-8 Foley, SF and Andronikov, AV and Halpin, JA and Daczko, NR and Jacob, DE, Mantle rocks in East Antarctica, Memoirs, 56 pp. 1-16. ISSN 0435-4052 (2021) [Refereed Article] http://ecite.utas.edu.au/149185 Earth Sciences Geology Igneous and metamorphic petrology Refereed Article PeerReviewed 2021 ftunivtasecite https://doi.org/10.1144/M56-2020-8 2022-04-11T22:16:47Z Only three localities of mantle xenoliths are known from all of East Antarctica, occurring at the Jetty Peninsula (LambertAmery Rift), Vestfold Hills and Gaussberg volcano. The latter two are spinel-facies peridotites, whereas the Jetty Peninsula rocks also include garnet-spinel lherzolites; all come from Indo-Antarctica. The mantle xenoliths of Jetty Peninsula and Vestfold Hills contain abundant geochemical and mineralogical evidence for multiple enrichment events that are attributed to infiltration of melts and their fluid products. Many of these episodes are spatially related to precursory activity along major trans-lithospheric structures that eventually led to the separation of India from Antarctica. Mantle rocks also occur at Schirmacher Oasis (Dronning Maud Land) and Haskard Highlands (Shackleton Ranges) as blocks tectonically emplaced in high-grade crustal rocks. These show varying degrees of alteration due to reaction with silicic crustal rocks or hydrous fluids: none correspond to unchanged mantle compositions. Geophysical surveys are our only information on the mantle lithosphere beneath the inland ice, and these can be used to infer the locations of thicker lithosphere probably related to cratons by southward extrapolation of coastal geological correlations. Intense local modification of the mantle lithosphere by melt infiltration and fluid movements may influence the large-scale images derived from geophysical data, and may be incorrectly interpreted as homogeneous compositions. Article in Journal/Newspaper Antarc* Antarctica Dronning Maud Land East Antarctica eCite UTAS (University of Tasmania) Dronning Maud Land East Antarctica Gaussberg ENVELOPE(89.183,89.183,-66.800,-66.800) Haskard Highlands ENVELOPE(-29.250,-29.250,-80.500,-80.500) Jetty Peninsula ENVELOPE(68.783,68.783,-70.652,-70.652) Shackleton Vestfold Vestfold Hills Geological Society, London, Memoirs M56-2020-8 |
institution |
Open Polar |
collection |
eCite UTAS (University of Tasmania) |
op_collection_id |
ftunivtasecite |
language |
English |
topic |
Earth Sciences Geology Igneous and metamorphic petrology |
spellingShingle |
Earth Sciences Geology Igneous and metamorphic petrology Foley, SF Andronikov, AV Halpin, JA Daczko, NR Jacob, DE Mantle rocks in East Antarctica |
topic_facet |
Earth Sciences Geology Igneous and metamorphic petrology |
description |
Only three localities of mantle xenoliths are known from all of East Antarctica, occurring at the Jetty Peninsula (LambertAmery Rift), Vestfold Hills and Gaussberg volcano. The latter two are spinel-facies peridotites, whereas the Jetty Peninsula rocks also include garnet-spinel lherzolites; all come from Indo-Antarctica. The mantle xenoliths of Jetty Peninsula and Vestfold Hills contain abundant geochemical and mineralogical evidence for multiple enrichment events that are attributed to infiltration of melts and their fluid products. Many of these episodes are spatially related to precursory activity along major trans-lithospheric structures that eventually led to the separation of India from Antarctica. Mantle rocks also occur at Schirmacher Oasis (Dronning Maud Land) and Haskard Highlands (Shackleton Ranges) as blocks tectonically emplaced in high-grade crustal rocks. These show varying degrees of alteration due to reaction with silicic crustal rocks or hydrous fluids: none correspond to unchanged mantle compositions. Geophysical surveys are our only information on the mantle lithosphere beneath the inland ice, and these can be used to infer the locations of thicker lithosphere probably related to cratons by southward extrapolation of coastal geological correlations. Intense local modification of the mantle lithosphere by melt infiltration and fluid movements may influence the large-scale images derived from geophysical data, and may be incorrectly interpreted as homogeneous compositions. |
format |
Article in Journal/Newspaper |
author |
Foley, SF Andronikov, AV Halpin, JA Daczko, NR Jacob, DE |
author_facet |
Foley, SF Andronikov, AV Halpin, JA Daczko, NR Jacob, DE |
author_sort |
Foley, SF |
title |
Mantle rocks in East Antarctica |
title_short |
Mantle rocks in East Antarctica |
title_full |
Mantle rocks in East Antarctica |
title_fullStr |
Mantle rocks in East Antarctica |
title_full_unstemmed |
Mantle rocks in East Antarctica |
title_sort |
mantle rocks in east antarctica |
publisher |
Geological Society of London |
publishDate |
2021 |
url |
https://doi.org/10.1144/M56-2020-8 http://ecite.utas.edu.au/149185 |
long_lat |
ENVELOPE(89.183,89.183,-66.800,-66.800) ENVELOPE(-29.250,-29.250,-80.500,-80.500) ENVELOPE(68.783,68.783,-70.652,-70.652) |
geographic |
Dronning Maud Land East Antarctica Gaussberg Haskard Highlands Jetty Peninsula Shackleton Vestfold Vestfold Hills |
geographic_facet |
Dronning Maud Land East Antarctica Gaussberg Haskard Highlands Jetty Peninsula Shackleton Vestfold Vestfold Hills |
genre |
Antarc* Antarctica Dronning Maud Land East Antarctica |
genre_facet |
Antarc* Antarctica Dronning Maud Land East Antarctica |
op_relation |
http://dx.doi.org/10.1144/M56-2020-8 Foley, SF and Andronikov, AV and Halpin, JA and Daczko, NR and Jacob, DE, Mantle rocks in East Antarctica, Memoirs, 56 pp. 1-16. ISSN 0435-4052 (2021) [Refereed Article] http://ecite.utas.edu.au/149185 |
op_doi |
https://doi.org/10.1144/M56-2020-8 |
container_title |
Geological Society, London, Memoirs |
container_start_page |
M56-2020-8 |
_version_ |
1766268584229601280 |