Geology of eastern Muhlig -Hofmannfjella and Filchnerfjella in Dronning Maud Land, East Antarctica; A preliminary report of a Japan-Norway-Germany joint geological investigation

• Main Authors: Masaaki Owada, Sotaro Baba, Andreas L. Laufer, Synnoeve Elvevold, Kazuyuki Shiraishi, Joachim Jacobs
• Format: Report
• Language: English
• Published: Department of Earth Sciences, Yamaguchi University/Department of Natural Environment, University of the Ryukyus/Geologisch-Palaontologisches Institut, Johann Wolfgang Goethe-Universitat/Norwegian Polar Institute/National Institute of Polar Research/Universitat Bremen 2003
• Subjects: central Dronning Maud Land; geology of Filchnerfjella; two-stage meta-morphism; Pan-African magmatism; Gondwana break-up; East Antarctica; Dronning Maud Land; Norway; Filchnerfjella; Antarc*; Antarctica; Polar geoscience
• Online Access: https://nipr.repo.nii.ac.jp/?action=repository_uri&item_id=3125; http://id.nii.ac.jp/1291/00003125/; https://nipr.repo.nii.ac.jp/?action=repository_action_common_download&item_id=3125&item_no=1&attribute_id=18&file_no=1

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.