Aspects of Jurassic magmatism and faulting in western Dronning Maud Land, Antarctica: implications for Gondwana break-up

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Abstract

Jurassic magnetism in Sverdrupfjella is manifested as saturated and undersaturated syenite intrusions and associated dykes. Dykes in the study area show two dominant orientations namely N-S and NE-SW. Faults and joints are oriented slightly north of east. In a Gondwana context, the NE dykes, which appear to be older (c.200 Ma), are oriented approximately parallel to σ1 and perpendicular to σ3 for the transpressional first stage of Gondwana break-up postulated by Cox in 1992. The N-S dykes and associated alkaline intrusions apepar to be c.170 Ma old and do not correlate with any of the stages of Cox. Faulting and jointing, which postdate the Tvora Syenite intrusion, appear to correlate with stage 2 of Cox indicating that this stage was amagmatic in Sverdrupfjella.

Original languageEnglish
Pages (from-to)63-71
Number of pages9
JournalUnknown Journal
Publication statusPublished - 1996
Externally publishedYes

ASJC Scopus subject areas

  • General Earth and Planetary Sciences
  • General Environmental Science

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