The nature of the West Antarctic Rift System as revealed by noble gases in mantle minerals
The noble gases He, Ne and Ar in fluid inclusions from mantle xenoliths at three localities in Northern Victoria Land (Baker Rocks, Greene Point and Handler Ridge), spanning about 300 km, provide new constraints on the nature of the lithospheric mantle beneath the West Antarctic Rift System (WARS)....
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Online Access: | https://hdl.handle.net/10281/428379 https://doi.org/10.1016/j.chemgeo.2019.06.020 |
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ftunivmilanobic:oai:boa.unimib.it:10281/428379 2024-04-14T08:01:26+00:00 The nature of the West Antarctic Rift System as revealed by noble gases in mantle minerals Correale A Pelorosso B Rizzo A Coltorti M Italiano F Bonadiman C Giacomoni P Correale, A Pelorosso, B Rizzo, A Coltorti, M Italiano, F Bonadiman, C Giacomoni, P 2019 STAMPA https://hdl.handle.net/10281/428379 https://doi.org/10.1016/j.chemgeo.2019.06.020 eng eng Elsevier BV country:NL info:eu-repo/semantics/altIdentifier/wos/WOS:000493088300008 volume:524 issue:5 October 2019 firstpage:104 lastpage:118 numberofpages:15 journal:CHEMICAL GEOLOGY https://hdl.handle.net/10281/428379 doi:10.1016/j.chemgeo.2019.06.020 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85067633091 info:eu-repo/semantics/closedAccess Antarctic Rift Fluid inclusion Mantle xenolith Metasomatism Noble gase SCLM info:eu-repo/semantics/article 2019 ftunivmilanobic https://doi.org/10.1016/j.chemgeo.2019.06.020 2024-03-21T16:11:05Z The noble gases He, Ne and Ar in fluid inclusions from mantle xenoliths at three localities in Northern Victoria Land (Baker Rocks, Greene Point and Handler Ridge), spanning about 300 km, provide new constraints on the nature of the lithospheric mantle beneath the West Antarctic Rift System (WARS). Mantle xenoliths are anhydrous and hydrous spinel-bearing lherzolite and harzburgite samples. The 4He/40Ar* ratios (0.004–0.39) in olivines, two pyroxenes and amphiboles are much lower than those typical of fertile mantle (1–5), suggesting that this lithospheric domain are consistent with a variably depleted mantle, as also indicated by the major- and trace-element compositions of whole rock and minerals. The 3He/4He ratios vary from 2.30 to 19.79 Ra. However, the lowest and highest 3He/4He ratios are related to the post-eruptive accumulation of radiogenic 4He and cosmogenic 3He, respectively. After filtering the data for these secondary effects, we constrain the 3He/4He signature of the subcontinental lithospheric mantle below this area to 7.1 ± 0.4 Ra (mean ± standard deviation). This isotope signature results from mantle metasomatism by asthenospheric melts with a MORB (mid-ocean ridge basalt)-type 3He/4He. The range of 7.1 ± 0.4 Ra is compatible with previous measurements in mantle xenoliths and lavas from other localities of the NVL, as far away as Mount Erebus, evidencing a homogeneous He-isotope signature beneath the entire rift. The He and Ne isotopes support the hypothesis that WARS origin is not related to a plume. Article in Journal/Newspaper Antarc* Antarctic Victoria Land Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) Antarctic Baker Rocks ENVELOPE(164.750,164.750,-74.233,-74.233) Greene ENVELOPE(168.233,168.233,-72.100,-72.100) Greene Point ENVELOPE(166.150,166.150,-73.817,-73.817) Handler Ridge ENVELOPE(167.000,167.000,-72.500,-72.500) Mount Erebus ENVELOPE(167.167,167.167,-77.533,-77.533) Victoria Land Chemical Geology 524 104 118 |
institution |
Open Polar |
collection |
Università degli Studi di Milano-Bicocca: BOA (Bicocca Open Archive) |
op_collection_id |
ftunivmilanobic |
language |
English |
topic |
Antarctic Rift Fluid inclusion Mantle xenolith Metasomatism Noble gase SCLM |
spellingShingle |
Antarctic Rift Fluid inclusion Mantle xenolith Metasomatism Noble gase SCLM Correale A Pelorosso B Rizzo A Coltorti M Italiano F Bonadiman C Giacomoni P The nature of the West Antarctic Rift System as revealed by noble gases in mantle minerals |
topic_facet |
Antarctic Rift Fluid inclusion Mantle xenolith Metasomatism Noble gase SCLM |
description |
The noble gases He, Ne and Ar in fluid inclusions from mantle xenoliths at three localities in Northern Victoria Land (Baker Rocks, Greene Point and Handler Ridge), spanning about 300 km, provide new constraints on the nature of the lithospheric mantle beneath the West Antarctic Rift System (WARS). Mantle xenoliths are anhydrous and hydrous spinel-bearing lherzolite and harzburgite samples. The 4He/40Ar* ratios (0.004–0.39) in olivines, two pyroxenes and amphiboles are much lower than those typical of fertile mantle (1–5), suggesting that this lithospheric domain are consistent with a variably depleted mantle, as also indicated by the major- and trace-element compositions of whole rock and minerals. The 3He/4He ratios vary from 2.30 to 19.79 Ra. However, the lowest and highest 3He/4He ratios are related to the post-eruptive accumulation of radiogenic 4He and cosmogenic 3He, respectively. After filtering the data for these secondary effects, we constrain the 3He/4He signature of the subcontinental lithospheric mantle below this area to 7.1 ± 0.4 Ra (mean ± standard deviation). This isotope signature results from mantle metasomatism by asthenospheric melts with a MORB (mid-ocean ridge basalt)-type 3He/4He. The range of 7.1 ± 0.4 Ra is compatible with previous measurements in mantle xenoliths and lavas from other localities of the NVL, as far away as Mount Erebus, evidencing a homogeneous He-isotope signature beneath the entire rift. The He and Ne isotopes support the hypothesis that WARS origin is not related to a plume. |
author2 |
Correale, A Pelorosso, B Rizzo, A Coltorti, M Italiano, F Bonadiman, C Giacomoni, P |
format |
Article in Journal/Newspaper |
author |
Correale A Pelorosso B Rizzo A Coltorti M Italiano F Bonadiman C Giacomoni P |
author_facet |
Correale A Pelorosso B Rizzo A Coltorti M Italiano F Bonadiman C Giacomoni P |
author_sort |
Correale A |
title |
The nature of the West Antarctic Rift System as revealed by noble gases in mantle minerals |
title_short |
The nature of the West Antarctic Rift System as revealed by noble gases in mantle minerals |
title_full |
The nature of the West Antarctic Rift System as revealed by noble gases in mantle minerals |
title_fullStr |
The nature of the West Antarctic Rift System as revealed by noble gases in mantle minerals |
title_full_unstemmed |
The nature of the West Antarctic Rift System as revealed by noble gases in mantle minerals |
title_sort |
nature of the west antarctic rift system as revealed by noble gases in mantle minerals |
publisher |
Elsevier BV |
publishDate |
2019 |
url |
https://hdl.handle.net/10281/428379 https://doi.org/10.1016/j.chemgeo.2019.06.020 |
long_lat |
ENVELOPE(164.750,164.750,-74.233,-74.233) ENVELOPE(168.233,168.233,-72.100,-72.100) ENVELOPE(166.150,166.150,-73.817,-73.817) ENVELOPE(167.000,167.000,-72.500,-72.500) ENVELOPE(167.167,167.167,-77.533,-77.533) |
geographic |
Antarctic Baker Rocks Greene Greene Point Handler Ridge Mount Erebus Victoria Land |
geographic_facet |
Antarctic Baker Rocks Greene Greene Point Handler Ridge Mount Erebus Victoria Land |
genre |
Antarc* Antarctic Victoria Land |
genre_facet |
Antarc* Antarctic Victoria Land |
op_relation |
info:eu-repo/semantics/altIdentifier/wos/WOS:000493088300008 volume:524 issue:5 October 2019 firstpage:104 lastpage:118 numberofpages:15 journal:CHEMICAL GEOLOGY https://hdl.handle.net/10281/428379 doi:10.1016/j.chemgeo.2019.06.020 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85067633091 |
op_rights |
info:eu-repo/semantics/closedAccess |
op_doi |
https://doi.org/10.1016/j.chemgeo.2019.06.020 |
container_title |
Chemical Geology |
container_volume |
524 |
container_start_page |
104 |
op_container_end_page |
118 |
_version_ |
1796308960742998016 |