Representative and whole rock analyses of rocks from Filchnerfjella, Antarctica

The geological history of Filchnerfjella and surrounding areas (2°E to 8°E) in central Dronning Maud Land, East Antarctica, is constructed from metamorphic and igneous petrology, and structural investigations. The geology of Filchner-fjella consists mainly of metamorphic rocks accompanied by intrusi...

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Bibliographic Details
Main Authors: Owada, Masaaki, Baba, Sotaro, Läufer, Andreas, Elvevold, Synnove, Shiraishi, Kazuyuki, Jacobs, Joachim
Format: Dataset
Language:English
Published: PANGAEA 2003
Subjects:
Dronning Maud Land
Antarctica
Filchnerfjella
Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas
ROCK
Rock sample
SPP1158
Arctic
Antarctic
East Antarctica
Antarc*
Polar geoscience
Sea ice
Online Access:https://doi.pangaea.de/10.1594/PANGAEA.849089
https://doi.org/10.1594/PANGAEA.849089
Description
Summary:The geological history of Filchnerfjella and surrounding areas (2°E to 8°E) in central Dronning Maud Land, East Antarctica, is constructed from metamorphic and igneous petrology, and structural investigations. The geology of Filchner-fjella consists mainly of metamorphic rocks accompanied by intrusive rocks. Two stages of metamorphism can be recognized in this area. The earlier stage metamorphism is defined as a porphyroblast stage (garnet, hornblende, and sillimanite stable), and the later one is recognized as a symplectic stage (orthopyroxene and cordieritestable). Taking metamorphic textures and geothermobarometries into account, the rocks experienced an early high-P/medium-T followed by a low-P and high-T stage. Partial melting took place during the low-P/high-T stage, because probable melt of leucocratic gneiss contains cordierite. The field relationships and petrography of the syenite at Filchnerfjella are similar to those of post-tectonic plutons from central Dronning Maud Land, and most of the post-tectonic intrusive rocks have within-plate geochemical features. The structural history in Filchnerfjella and surrounding areas can be divided into the Pan-African stage and the Meso to Cenozoic stage that relates to the break-up of Gondwana.

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