Mafic Dykes from Heimefrontfjella and implications for the post-Grenvillian to pre-Pan-African geological evolution of western Dronning Maud Land, Antarctica
Two groups of geochemical different dykes have been identified in the Grenville-aged basement of Heimefrontfjella. The first group comprises dykes of continental tholeiite composition which probably intruded during the final stage of indentation of the Kaapvaal—Grunehogna Craton into Laurentia. One...
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Online Access: | http://dx.doi.org/10.1017/s0954102003001391 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102003001391 |
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crcambridgeupr:10.1017/s0954102003001391 2024-05-19T07:32:36+00:00 Mafic Dykes from Heimefrontfjella and implications for the post-Grenvillian to pre-Pan-African geological evolution of western Dronning Maud Land, Antarctica BAUER, W. FIELITZ, W. JACOBS, J. FANNING, C.M. SPAETH, G. 2003 http://dx.doi.org/10.1017/s0954102003001391 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102003001391 en eng Cambridge University Press (CUP) https://www.cambridge.org/core/terms Antarctic Science volume 15, issue 3, page 379-391 ISSN 0954-1020 1365-2079 journal-article 2003 crcambridgeupr https://doi.org/10.1017/s0954102003001391 2024-05-02T06:51:04Z Two groups of geochemical different dykes have been identified in the Grenville-aged basement of Heimefrontfjella. The first group comprises dykes of continental tholeiite composition which probably intruded during the final stage of indentation of the Kaapvaal—Grunehogna Craton into Laurentia. One dyke of this group yielded an U—Pb zircon SHRIMP age of 1033 ± 7 Ma. The second group has an E-type MORB composition and may be related to ocean floor basalts of the Mozambique Ocean between East and West Gondwana. A preliminary U—Pb SHRIMP age of 586 ± 7 Ma for a single zircon crystal was obtained from a dyke of the second group. During the Pan-African orogeny both dyke groups underwent metamorphism and tectonism at different grades: up to amphibolite-facies in the eastern and southern Heimefrontfjella, and at greenschist-facies in the western and northern Heimefrontfjella. The older dykes may be correlated with the Equeefa suite of southern Natal whereas the younger dyke group is not correlatable with any known mafic intrusions or lava flows in adjacent regions. Article in Journal/Newspaper Antarc* Antarctic Science Antarctica Dronning Maud Land Cambridge University Press Antarctic Science 15 3 379 391 |
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Open Polar |
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Cambridge University Press |
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English |
description |
Two groups of geochemical different dykes have been identified in the Grenville-aged basement of Heimefrontfjella. The first group comprises dykes of continental tholeiite composition which probably intruded during the final stage of indentation of the Kaapvaal—Grunehogna Craton into Laurentia. One dyke of this group yielded an U—Pb zircon SHRIMP age of 1033 ± 7 Ma. The second group has an E-type MORB composition and may be related to ocean floor basalts of the Mozambique Ocean between East and West Gondwana. A preliminary U—Pb SHRIMP age of 586 ± 7 Ma for a single zircon crystal was obtained from a dyke of the second group. During the Pan-African orogeny both dyke groups underwent metamorphism and tectonism at different grades: up to amphibolite-facies in the eastern and southern Heimefrontfjella, and at greenschist-facies in the western and northern Heimefrontfjella. The older dykes may be correlated with the Equeefa suite of southern Natal whereas the younger dyke group is not correlatable with any known mafic intrusions or lava flows in adjacent regions. |
format |
Article in Journal/Newspaper |
author |
BAUER, W. FIELITZ, W. JACOBS, J. FANNING, C.M. SPAETH, G. |
spellingShingle |
BAUER, W. FIELITZ, W. JACOBS, J. FANNING, C.M. SPAETH, G. Mafic Dykes from Heimefrontfjella and implications for the post-Grenvillian to pre-Pan-African geological evolution of western Dronning Maud Land, Antarctica |
author_facet |
BAUER, W. FIELITZ, W. JACOBS, J. FANNING, C.M. SPAETH, G. |
author_sort |
BAUER, W. |
title |
Mafic Dykes from Heimefrontfjella and implications for the post-Grenvillian to pre-Pan-African geological evolution of western Dronning Maud Land, Antarctica |
title_short |
Mafic Dykes from Heimefrontfjella and implications for the post-Grenvillian to pre-Pan-African geological evolution of western Dronning Maud Land, Antarctica |
title_full |
Mafic Dykes from Heimefrontfjella and implications for the post-Grenvillian to pre-Pan-African geological evolution of western Dronning Maud Land, Antarctica |
title_fullStr |
Mafic Dykes from Heimefrontfjella and implications for the post-Grenvillian to pre-Pan-African geological evolution of western Dronning Maud Land, Antarctica |
title_full_unstemmed |
Mafic Dykes from Heimefrontfjella and implications for the post-Grenvillian to pre-Pan-African geological evolution of western Dronning Maud Land, Antarctica |
title_sort |
mafic dykes from heimefrontfjella and implications for the post-grenvillian to pre-pan-african geological evolution of western dronning maud land, antarctica |
publisher |
Cambridge University Press (CUP) |
publishDate |
2003 |
url |
http://dx.doi.org/10.1017/s0954102003001391 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102003001391 |
genre |
Antarc* Antarctic Science Antarctica Dronning Maud Land |
genre_facet |
Antarc* Antarctic Science Antarctica Dronning Maud Land |
op_source |
Antarctic Science volume 15, issue 3, page 379-391 ISSN 0954-1020 1365-2079 |
op_rights |
https://www.cambridge.org/core/terms |
op_doi |
https://doi.org/10.1017/s0954102003001391 |
container_title |
Antarctic Science |
container_volume |
15 |
container_issue |
3 |
container_start_page |
379 |
op_container_end_page |
391 |
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1799470715385151488 |