Geochemistry of Ferrar Dolerite sills and dykes at Terra Cotta Mountain, south Victoria Land, Antarctica
At Terra Cotta Mountain, in the Taylor Glacier region of south Victoria Land, a 237 m thick Ferrar Dolerite sill is intruded along the unconformity between basement granitoids and overlying Beacon Supergroup sedimentary rocks. Numerous Ferrar Dolerite dykes intrude the Beacon Supergroup and represen...
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Cambridge University Press (CUP)
1995
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Online Access: | http://dx.doi.org/10.1017/s0954102095000113 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102095000113 |
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crcambridgeupr:10.1017/s0954102095000113 2024-04-28T07:56:04+00:00 Geochemistry of Ferrar Dolerite sills and dykes at Terra Cotta Mountain, south Victoria Land, Antarctica Morrison, A.D. Reay, A. 1995 http://dx.doi.org/10.1017/s0954102095000113 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102095000113 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 7, issue 1, page 73-85 ISSN 0954-1020 1365-2079 Geology Ecology, Evolution, Behavior and Systematics Oceanography journal-article 1995 crcambridgeupr https://doi.org/10.1017/s0954102095000113 2024-04-09T06:56:13Z At Terra Cotta Mountain, in the Taylor Glacier region of south Victoria Land, a 237 m thick Ferrar Dolerite sill is intruded along the unconformity between basement granitoids and overlying Beacon Supergroup sedimentary rocks. Numerous Ferrar Dolerite dykes intrude the Beacon Supergroup and represent later phases of intrusion. Major and trace element data indicate variation both within and between the separate intrusions. Crystal fractionation accounts for much of the geochemical variation between the intrusive events. However, poor correlations between many trace elements require the additional involvement of open system processes. Chromium is decoupled from highly incompatible elements consistent with behaviour predicted for a periodically replenished, tapped and fractionating magma chamber. Large ion lithophile element-enrichment and depletion in Nb, Sr, P and Ti suggests the addition of a crustal component or an enriched mantle source. The trace element characteristics of the Dolerites from Terra Cotta Mountain are similar to those of other Ferrar Group rocks from the central Transantarctic Mountains and north Victoria Land, as well as with the Tasmanian Dolerites. This supports current ideas that the trace element signature of the Ferrar Group is inherited from a uniformly enriched mantle source region. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Taylor Glacier Victoria Land Cambridge University Press Antarctic Science 7 1 73 85 |
institution |
Open Polar |
collection |
Cambridge University Press |
op_collection_id |
crcambridgeupr |
language |
English |
topic |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
spellingShingle |
Geology Ecology, Evolution, Behavior and Systematics Oceanography Morrison, A.D. Reay, A. Geochemistry of Ferrar Dolerite sills and dykes at Terra Cotta Mountain, south Victoria Land, Antarctica |
topic_facet |
Geology Ecology, Evolution, Behavior and Systematics Oceanography |
description |
At Terra Cotta Mountain, in the Taylor Glacier region of south Victoria Land, a 237 m thick Ferrar Dolerite sill is intruded along the unconformity between basement granitoids and overlying Beacon Supergroup sedimentary rocks. Numerous Ferrar Dolerite dykes intrude the Beacon Supergroup and represent later phases of intrusion. Major and trace element data indicate variation both within and between the separate intrusions. Crystal fractionation accounts for much of the geochemical variation between the intrusive events. However, poor correlations between many trace elements require the additional involvement of open system processes. Chromium is decoupled from highly incompatible elements consistent with behaviour predicted for a periodically replenished, tapped and fractionating magma chamber. Large ion lithophile element-enrichment and depletion in Nb, Sr, P and Ti suggests the addition of a crustal component or an enriched mantle source. The trace element characteristics of the Dolerites from Terra Cotta Mountain are similar to those of other Ferrar Group rocks from the central Transantarctic Mountains and north Victoria Land, as well as with the Tasmanian Dolerites. This supports current ideas that the trace element signature of the Ferrar Group is inherited from a uniformly enriched mantle source region. |
format |
Article in Journal/Newspaper |
author |
Morrison, A.D. Reay, A. |
author_facet |
Morrison, A.D. Reay, A. |
author_sort |
Morrison, A.D. |
title |
Geochemistry of Ferrar Dolerite sills and dykes at Terra Cotta Mountain, south Victoria Land, Antarctica |
title_short |
Geochemistry of Ferrar Dolerite sills and dykes at Terra Cotta Mountain, south Victoria Land, Antarctica |
title_full |
Geochemistry of Ferrar Dolerite sills and dykes at Terra Cotta Mountain, south Victoria Land, Antarctica |
title_fullStr |
Geochemistry of Ferrar Dolerite sills and dykes at Terra Cotta Mountain, south Victoria Land, Antarctica |
title_full_unstemmed |
Geochemistry of Ferrar Dolerite sills and dykes at Terra Cotta Mountain, south Victoria Land, Antarctica |
title_sort |
geochemistry of ferrar dolerite sills and dykes at terra cotta mountain, south victoria land, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
1995 |
url |
http://dx.doi.org/10.1017/s0954102095000113 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102095000113 |
genre |
Antarc* Antarctic Science Antarctica Taylor Glacier Victoria Land |
genre_facet |
Antarc* Antarctic Science Antarctica Taylor Glacier Victoria Land |
op_source |
Antarctic Science volume 7, issue 1, page 73-85 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102095000113 |
container_title |
Antarctic Science |
container_volume |
7 |
container_issue |
1 |
container_start_page |
73 |
op_container_end_page |
85 |
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1797581953323499520 |