Geochemical evolution of lithospheric mantle beneath SE South Australia
The record of mafic magmatism from the Proterozoic to the Holocene in southern Australia reflects episodic incompatible element enrichment of the sub-continental lithospheric mantle (SCLM) recording periodic interaction of asthenosphere and lithosphere. The composition of Jurassic and Cainozoic mant...
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Online Access: | http://hdl.handle.net/2440/13654 https://doi.org/10.1016/S0009-2541(01)00347-3 |
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ftunivadelaidedl:oai:digital.library.adelaide.edu.au:2440/13654 2023-05-15T13:51:55+02:00 Geochemical evolution of lithospheric mantle beneath SE South Australia Foden, J. Song, S. Turner, S. Elburg, M. Smith, P. Van der Steldt, B. Penglis, V. 2002 http://hdl.handle.net/2440/13654 https://doi.org/10.1016/S0009-2541(01)00347-3 en eng Elsevier Science BV Chemical Geology, 2002; 182(2-4):663-695 0009-2541 1872-6836 http://hdl.handle.net/2440/13654 doi:10.1016/S0009-2541(01)00347-3 Foden, J. [0000-0003-3564-7253] Sub-continental lithospheric mantle Basalts Tasman Line Ross–Delamerian Orogen Mantle enrichment Journal article 2002 ftunivadelaidedl https://doi.org/10.1016/S0009-2541(01)00347-3 2023-02-05T19:37:22Z The record of mafic magmatism from the Proterozoic to the Holocene in southern Australia reflects episodic incompatible element enrichment of the sub-continental lithospheric mantle (SCLM) recording periodic interaction of asthenosphere and lithosphere. The composition of Jurassic and Cainozoic mantle derived magmas is strongly influenced by the geochemical impact on the SCLM of events which took place during the Neoproterozoic and Cambrian. These events include rifting, passive margin development and orogenesis. Neoproterozoic to Cambrian basalts are widespread in western New South Wales, South Australia and Tasmania and reflect mantle decompression during extension and rifting of the Australian–East Antarctic Craton during the development of the proto-Pacific passive margin. These basalts fall into two regionally extensive and very different suites: (i) a voluminous suite of tholeiites and (ii) a highly undersaturated alkaline (nephelinite–basanite) series. Both Jurassic kimberlite magmas from the Adelaide Fold Belt and highly undersaturated Quaternary analcimites and basanites from the Mt. Gambier district of S.E. South Australia, have geochemical characteristics like those of the Precambrian–Cambrian alkaline suites. They have high concentrations of large ion lithophile (LIL), rare earth (RE) and high field strength (HFS) elements, and high HFSE/LILE and LREE/HREE ratios with TDMNd values of 0.5–0.8 Ga. The Jurassic kimberlites appear to sample lithospheric mantle enrichment zones of Late Neoproterozoic to Early Cambrian age. The Quaternary suites result from mixing of contemporary mantle plume components with this old lithospheric enrichment, which is also identified with the occurrence of metasomatic phlogopite, amphibole and apatite in lherzolite mantle xenoliths from a number of Cainozoic volcanoes in Western Victoria. A very different type of lithospheric mantle enrichment took place during the late stages of the Ross–Delamerian Orogeny. This yielded a crustally contaminated mantle zone that mirrors the ... Article in Journal/Newspaper Antarc* Antarctic The University of Adelaide: Digital Library Antarctic Pacific Chemical Geology 182 2-4 663 695 |
institution |
Open Polar |
collection |
The University of Adelaide: Digital Library |
op_collection_id |
ftunivadelaidedl |
language |
English |
topic |
Sub-continental lithospheric mantle Basalts Tasman Line Ross–Delamerian Orogen Mantle enrichment |
spellingShingle |
Sub-continental lithospheric mantle Basalts Tasman Line Ross–Delamerian Orogen Mantle enrichment Foden, J. Song, S. Turner, S. Elburg, M. Smith, P. Van der Steldt, B. Penglis, V. Geochemical evolution of lithospheric mantle beneath SE South Australia |
topic_facet |
Sub-continental lithospheric mantle Basalts Tasman Line Ross–Delamerian Orogen Mantle enrichment |
description |
The record of mafic magmatism from the Proterozoic to the Holocene in southern Australia reflects episodic incompatible element enrichment of the sub-continental lithospheric mantle (SCLM) recording periodic interaction of asthenosphere and lithosphere. The composition of Jurassic and Cainozoic mantle derived magmas is strongly influenced by the geochemical impact on the SCLM of events which took place during the Neoproterozoic and Cambrian. These events include rifting, passive margin development and orogenesis. Neoproterozoic to Cambrian basalts are widespread in western New South Wales, South Australia and Tasmania and reflect mantle decompression during extension and rifting of the Australian–East Antarctic Craton during the development of the proto-Pacific passive margin. These basalts fall into two regionally extensive and very different suites: (i) a voluminous suite of tholeiites and (ii) a highly undersaturated alkaline (nephelinite–basanite) series. Both Jurassic kimberlite magmas from the Adelaide Fold Belt and highly undersaturated Quaternary analcimites and basanites from the Mt. Gambier district of S.E. South Australia, have geochemical characteristics like those of the Precambrian–Cambrian alkaline suites. They have high concentrations of large ion lithophile (LIL), rare earth (RE) and high field strength (HFS) elements, and high HFSE/LILE and LREE/HREE ratios with TDMNd values of 0.5–0.8 Ga. The Jurassic kimberlites appear to sample lithospheric mantle enrichment zones of Late Neoproterozoic to Early Cambrian age. The Quaternary suites result from mixing of contemporary mantle plume components with this old lithospheric enrichment, which is also identified with the occurrence of metasomatic phlogopite, amphibole and apatite in lherzolite mantle xenoliths from a number of Cainozoic volcanoes in Western Victoria. A very different type of lithospheric mantle enrichment took place during the late stages of the Ross–Delamerian Orogeny. This yielded a crustally contaminated mantle zone that mirrors the ... |
format |
Article in Journal/Newspaper |
author |
Foden, J. Song, S. Turner, S. Elburg, M. Smith, P. Van der Steldt, B. Penglis, V. |
author_facet |
Foden, J. Song, S. Turner, S. Elburg, M. Smith, P. Van der Steldt, B. Penglis, V. |
author_sort |
Foden, J. |
title |
Geochemical evolution of lithospheric mantle beneath SE South Australia |
title_short |
Geochemical evolution of lithospheric mantle beneath SE South Australia |
title_full |
Geochemical evolution of lithospheric mantle beneath SE South Australia |
title_fullStr |
Geochemical evolution of lithospheric mantle beneath SE South Australia |
title_full_unstemmed |
Geochemical evolution of lithospheric mantle beneath SE South Australia |
title_sort |
geochemical evolution of lithospheric mantle beneath se south australia |
publisher |
Elsevier Science BV |
publishDate |
2002 |
url |
http://hdl.handle.net/2440/13654 https://doi.org/10.1016/S0009-2541(01)00347-3 |
geographic |
Antarctic Pacific |
geographic_facet |
Antarctic Pacific |
genre |
Antarc* Antarctic |
genre_facet |
Antarc* Antarctic |
op_relation |
Chemical Geology, 2002; 182(2-4):663-695 0009-2541 1872-6836 http://hdl.handle.net/2440/13654 doi:10.1016/S0009-2541(01)00347-3 Foden, J. [0000-0003-3564-7253] |
op_doi |
https://doi.org/10.1016/S0009-2541(01)00347-3 |
container_title |
Chemical Geology |
container_volume |
182 |
container_issue |
2-4 |
container_start_page |
663 |
op_container_end_page |
695 |
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1766255950132412416 |