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: | http://hdl.handle.net/11392/2407247 https://doi.org/10.1016/j.chemgeo.2019.06.020 https://www.sciencedirect.com/science/article/pii/S0009254119303158 |
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ftunivferrarair:oai:iris.unife.it:11392/2407247 2024-02-11T09:57:54+01:00 The nature of the West Antarctic Rift System as revealed by noble gases in mantle minerals Correale A. Pelorosso B. RIZZO, ANDREA LUCA Coltorti M. Italiano F. Bonadiman C. Giacomoni P. P. Correale, A. Pelorosso, B. Rizzo, ANDREA LUCA Coltorti, M. Italiano, F. Bonadiman, C. Giacomoni, P. P. 2019 ELETTRONICO http://hdl.handle.net/11392/2407247 https://doi.org/10.1016/j.chemgeo.2019.06.020 https://www.sciencedirect.com/science/article/pii/S0009254119303158 eng eng info:eu-repo/semantics/altIdentifier/wos/WOS:000493088300008 volume:524 firstpage:104 lastpage:118 numberofpages:15 journal:CHEMICAL GEOLOGY http://hdl.handle.net/11392/2407247 doi:10.1016/j.chemgeo.2019.06.020 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85067633091 https://www.sciencedirect.com/science/article/pii/S0009254119303158 info:eu-repo/semantics/closedAccess Antarctic Rift Fluid inclusions Mantle xenolith Metasomatism Noble gases SCLM info:eu-repo/semantics/article 2019 ftunivferrarair https://doi.org/10.1016/j.chemgeo.2019.06.020 2024-01-24T17:41:21Z 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 Ferrara: CINECA IRIS 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 Ferrara: CINECA IRIS |
op_collection_id |
ftunivferrarair |
language |
English |
topic |
Antarctic Rift Fluid inclusions Mantle xenolith Metasomatism Noble gases SCLM |
spellingShingle |
Antarctic Rift Fluid inclusions Mantle xenolith Metasomatism Noble gases SCLM Correale A. Pelorosso B. RIZZO, ANDREA LUCA Coltorti M. Italiano F. Bonadiman C. Giacomoni P. P. The nature of the West Antarctic Rift System as revealed by noble gases in mantle minerals |
topic_facet |
Antarctic Rift Fluid inclusions Mantle xenolith Metasomatism Noble gases 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, ANDREA LUCA Coltorti, M. Italiano, F. Bonadiman, C. Giacomoni, P. P. |
format |
Article in Journal/Newspaper |
author |
Correale A. Pelorosso B. RIZZO, ANDREA LUCA Coltorti M. Italiano F. Bonadiman C. Giacomoni P. P. |
author_facet |
Correale A. Pelorosso B. RIZZO, ANDREA LUCA Coltorti M. Italiano F. Bonadiman C. Giacomoni P. 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 |
publishDate |
2019 |
url |
http://hdl.handle.net/11392/2407247 https://doi.org/10.1016/j.chemgeo.2019.06.020 https://www.sciencedirect.com/science/article/pii/S0009254119303158 |
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 firstpage:104 lastpage:118 numberofpages:15 journal:CHEMICAL GEOLOGY http://hdl.handle.net/11392/2407247 doi:10.1016/j.chemgeo.2019.06.020 info:eu-repo/semantics/altIdentifier/scopus/2-s2.0-85067633091 https://www.sciencedirect.com/science/article/pii/S0009254119303158 |
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 |
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1790593437117972480 |