Geochemistry of post-kinematic mafic dykes from central to eastern Dronning Maud Land, East Antarctica: Evidence for a Pan-African suture in Dronning Maud Land

Masaaki Owada, Sotaro Baba, Yasuhito Osanai, Hiroo Kagami

Research output: Contribution to journalArticle

9 Citations (Scopus)

Abstract

The region comprising central to eastern Dronning Maud Land (2°W to 40°E), East Antarctica, is underlain by Mesoproterozoic to Cambrian metamorphic rocks and post-kinematic intrusive rocks with varied compositions. The post-kinematic mafic dykes linked to the Pan-African orogen include various types of lithologies: lamprophyre and lamproite in Mühlig-Hofmannfjella in central Dronning Maud Land and lamprophyre and high-K dolerite in the Sør Rondane Mountains in eastern Dronning Maud Land. Most of the mafic dykes have been weakly affected by low-grade metamorphism, but clearly preserve their igneous textures. The mafic dykes show a high abundance of Rb, Ba, Sr and light rare earth elements with negative anomalies of Nb, Ta and Ti in a multi-element primitive mantle-normalized diagram. The geochemical characteristics of the mafic dykes suggest that they were derived from a metasomatized mantle source leaving phlogopite, rutile and/or titanite as residual phases. Considering Sr and Nd isotopic systematics of the mafic dykes and the host metamorphic rocks and coeval felsic intrusive rocks, a large crustal boundary potentially related to a suture zone of West and East Gondwana should pass between Mühlig-Hofmannfjella and the Sør Rondane Mountains.

Original languageEnglish
Pages (from-to)235-252
Number of pages18
JournalGeological Society Special Publication
Volume308
DOIs
Publication statusPublished - Dec 1 2008

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Metamorphic rocks
Geochemistry
lamprophyre
Kinematics
kinematics
geochemistry
Rocks
metamorphic rock
Lithology
Rare earth elements
lamproite
low grade metamorphism
mountain
Textures
felsic rock
suture zone
phlogopite
titanite
rutile
diabase

All Science Journal Classification (ASJC) codes

  • Water Science and Technology
  • Ocean Engineering
  • Geology

Cite this

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title = "Geochemistry of post-kinematic mafic dykes from central to eastern Dronning Maud Land, East Antarctica: Evidence for a Pan-African suture in Dronning Maud Land",
abstract = "The region comprising central to eastern Dronning Maud Land (2°W to 40°E), East Antarctica, is underlain by Mesoproterozoic to Cambrian metamorphic rocks and post-kinematic intrusive rocks with varied compositions. The post-kinematic mafic dykes linked to the Pan-African orogen include various types of lithologies: lamprophyre and lamproite in M{\"u}hlig-Hofmannfjella in central Dronning Maud Land and lamprophyre and high-K dolerite in the S{\o}r Rondane Mountains in eastern Dronning Maud Land. Most of the mafic dykes have been weakly affected by low-grade metamorphism, but clearly preserve their igneous textures. The mafic dykes show a high abundance of Rb, Ba, Sr and light rare earth elements with negative anomalies of Nb, Ta and Ti in a multi-element primitive mantle-normalized diagram. The geochemical characteristics of the mafic dykes suggest that they were derived from a metasomatized mantle source leaving phlogopite, rutile and/or titanite as residual phases. Considering Sr and Nd isotopic systematics of the mafic dykes and the host metamorphic rocks and coeval felsic intrusive rocks, a large crustal boundary potentially related to a suture zone of West and East Gondwana should pass between M{\"u}hlig-Hofmannfjella and the S{\o}r Rondane Mountains.",
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