RAS Earth ScienceГеохимия Geochemistry International

  • ISSN (Print) 0016-7525
  • ISSN (Online) 3034-4956

Shaka Ridge (South Atlantic): a Remnant of Continental Crust?

PII
10.31857/S0016752524120034-1
DOI
10.31857/S0016752524120034
Publication type
Article
Status
Published
Authors
Volume/ Edition
Volume 69 / Issue number 12
Pages
1151-1173
Abstract
As a result of a study of igneous rocks of the basalt — andesite series, dredged on the Shaka Ridge in the South Atlantic, it was found that they differ from the basalts of mid-ocean ridges and ocean islands, and have an age of 183–186 Ma, corresponding to the time of manifestation of the Karoo-Mod mantle plume in central Gondwana. The input of ice-rafted debris into the study area due to ice transportion is considered unlikely. Geochemical and isotopic features of the studied igneous rocks show their similarity with the Jurassic mafic complexes of the Ferrar province in Antarctica and the Falkland Islands, formed during the intrusion of the Karoo Maud plume and paleo-Pacific subduction. Based on the all data obtained, it was concluded that the Shaka Ridge is a continental block that was moved during the opening of the South Atlantic in the Early Cretaceous-Early Miocene from the continental margin of Africa along an extended transform fault into the present Bouvet triple junction area.
Keywords
Южная Атлантика срединно-океанический хребет трансформные разломы хребет Шака мантийный плюм горячая точка континентальная кора геохимия геохронология
Date of publication
15.12.2024
Year of publication
2024
Number of purchasers
0
Views
59

References

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