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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ftanucanberra:oai:digitalcollections.anu.edu.au:1885/88651 2023-05-15T13:56:14+02:00 Mafic Dykes from Heimefrontfjella and implications for the post-Grenvillian to pre-Pan-African geological evolution of western Dronning Maud Land, Antarctica Bauer, Wolfgang Fielitz, W. Jacobs, Jeffrey Bruce Fanning, Christopher Spaeth, G 2015-12-13T23:14:31Z http://hdl.handle.net/1885/88651 unknown British Antarctic Survey 0954-1020 http://hdl.handle.net/1885/88651 Antarctic Science Keywords: dike swarm geochemistry mafic rock mid-ocean ridge basalt Proterozoic SHRIMP dating tholeiite Antarctica Laurentia Geochemistry Maud Belt Tholeiitic dykes U-Pb zircon SHRIMP data Journal article 2015 ftanucanberra 2015-12-21T23:57:01Z 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 Australian National University: ANU Digital Collections Dronning Maud Land Grunehogna ENVELOPE(-2.750,-2.750,-72.033,-72.033) Heimefrontfjella ENVELOPE(-11.000,-11.000,-74.667,-74.667) |
institution |
Open Polar |
collection |
Australian National University: ANU Digital Collections |
op_collection_id |
ftanucanberra |
language |
unknown |
topic |
Keywords: dike swarm geochemistry mafic rock mid-ocean ridge basalt Proterozoic SHRIMP dating tholeiite Antarctica Laurentia Geochemistry Maud Belt Tholeiitic dykes U-Pb zircon SHRIMP data |
spellingShingle |
Keywords: dike swarm geochemistry mafic rock mid-ocean ridge basalt Proterozoic SHRIMP dating tholeiite Antarctica Laurentia Geochemistry Maud Belt Tholeiitic dykes U-Pb zircon SHRIMP data Bauer, Wolfgang Fielitz, W. Jacobs, Jeffrey Bruce Fanning, Christopher Spaeth, G Mafic Dykes from Heimefrontfjella and implications for the post-Grenvillian to pre-Pan-African geological evolution of western Dronning Maud Land, Antarctica |
topic_facet |
Keywords: dike swarm geochemistry mafic rock mid-ocean ridge basalt Proterozoic SHRIMP dating tholeiite Antarctica Laurentia Geochemistry Maud Belt Tholeiitic dykes U-Pb zircon SHRIMP data |
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, Wolfgang Fielitz, W. Jacobs, Jeffrey Bruce Fanning, Christopher Spaeth, G |
author_facet |
Bauer, Wolfgang Fielitz, W. Jacobs, Jeffrey Bruce Fanning, Christopher Spaeth, G |
author_sort |
Bauer, Wolfgang |
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 |
British Antarctic Survey |
publishDate |
2015 |
url |
http://hdl.handle.net/1885/88651 |
long_lat |
ENVELOPE(-2.750,-2.750,-72.033,-72.033) ENVELOPE(-11.000,-11.000,-74.667,-74.667) |
geographic |
Dronning Maud Land Grunehogna Heimefrontfjella |
geographic_facet |
Dronning Maud Land Grunehogna Heimefrontfjella |
genre |
Antarc* Antarctic Science Antarctica Dronning Maud Land |
genre_facet |
Antarc* Antarctic Science Antarctica Dronning Maud Land |
op_source |
Antarctic Science |
op_relation |
0954-1020 http://hdl.handle.net/1885/88651 |
_version_ |
1766263601908154368 |