cover

International GeoMaud Expedition of the BGR to Central Dronning Maud Land in 1995/96 - Volume I: Geological Results

Polar Issue No. 10
IUGS IGCP Project 368

Ed.: Hans-Jürgen Paech

2004. 499 pages, 134 figures, 47 tables, 27 plates, 3 maps, 17x24cm, 1390 g
Language: English

(Geologisches Jahrbuch Reihe B, Band B 96)

ISBN 978-3-510-95923-5, paperback, price: 92.00 €

in stock and ready to ship

Order form

BibTeX file

Keywords

GeoMaud expeditionBGRCentral Donning Maud Land

Contents

Synopsis top ↑

The papers in this volume cover the orthogneisses and the Pan-African granitoids and charnockites, in addition to studies on the regional metamorphism and the structural evolution of central Dronning Maud Land (DML).
The crust of central Dronning Maud Land is composed of late Mesoproterozoic metavolcanic and metasedimentary rock sequences which experienced Grenville deformation and metamorphism. Coevally, metaplutonic rocks formed to an unknown extent. These late Mesoproterozoic rocks were pervasively reactivated during the PanAfrican events, almost completely obliterating the Grenville structures. Additionally, during the Pan-African events (600-500 Ma) the metamorphic crust in central Dronning Maud Land was intruded by a huge amount of igneous rock as discordant plutons ranging in composition from anorthosite to granite/syenite, some of which may now be metaplutonic rocks.

The mountains and nunataks of central Dronning Maud Land (cDML) were discovered by the air-borne German Schwabenland expedition in 1939. R. Schirmacher in a "Dornier" fixed-wing aircraft in the early afternoon of February 3 flew over an area of many ponds (originally named Schirmacher Seenplatte [Schirmacher Lake District], now Schirmacheroase [Schirmacher Oasis]). In his flight book he wrote: "Stützpunkt für spätere Landexpedition?" (Base for a later ground-based expedition?). Starting with the International Geophysical Year in 1959, the region of cDML has been of interest for geological and geophysical field research during Soviet Antarctic expeditions or for round-year observation programs. East German (GDR) scientists joined the Soviet team in 1976 and a geological program was started in 1983. In Potsdam, at the end of the eighties (1988/89) the GDR Antarctic committee planned a geoscientific expedition to cDML (already using the acronym GeoMaud) for the beginning of the nineties. After German unification in 1990, East German scientific institutions were completely reorganized. However, in contrast to other scientific projects, the East German polar research program was preserved. The East German geologists could join the Federal Institute for Geosciences and Natural Resources (BGR, Hannover), which began conducting geological expeditions in the 1980s. The BGR research program was modified to include the planned GeoMaud program. During a planning meeting of the German Polar Research community at the end of 1991, BGR announced plans for the GeoMaud expedition during the 1995/96 season. Hence, the expedition was conducted under much better logistic conditions than would have been previously. The program objectives covered a wide spectrum of geoscientific disciplines. Most of the objectives were successfully fulfilled. Only, the planned offshore-onshore deep seismic soundings could not conducted due to heavy ice conditions. However, a multichannel seismic survey was conducted across Astrid Ridge off cDML.

The results presented in this volume fill gaps in the knowledge of the geological structure and history of cDML and thus find interest in the Antarctic research community.

Contents top ↑

Hans-Jürgen Paech:
Preface
Fabrizio Colombo & Franco Talarico:
Regional Metamorphism in the High-Grade Basement of Central Dronning
Maud Land, East Antarctica
Evgueni Mikhalsky & Joachim Jacobs:
Orthogneisses in Central Dronning Maud Land, East Antarctica: Their
Origin and Tectonic Setting
Gregor Markl, Sandra Piazolo, Wilfried Bauer, Hans-Jürgen Paech,
Evgueni Mikhalsky & Ulrich Krauss:
Pan-African Massif-Type Anorthosites from Central Dronning Maud Land,
East Antarctica
Gregor Markl & Friedhelm Henjes-Kunst:
Magmatic Conditions of Formation and Autometasomatism of
Post-Kinematic Charnockites in Central Dronning Maud Land, East
Antarctica: A Model of Magmatic Evolution
Norbert W. Roland:
Pan-African Granite-Charnockite Magmatism in Central Dronning Maud
Land, East Antarctica: Petrography, Geochemistry and Plate Tectonic
Implications
Evgueni Mikhalsky:
Geochemistry of Deformed Mafic to Intermediate Dykes in Central
Dronning Maud Land, East Antarctica
Friedhelm Henjes-Kunst:
Further Evidence for Pan-African Polyphase Magmatism and Metamorphism
in Central Dronning Maud Land, East Antarctica, from Rocks at
Schirmacheroase: A Geochronological Study
Evgueni Mikhalsky & Thorolf W. Weiser:
Incipient Charnockite or Hydrated Granulite in the Conradgebirge in
Central Dronning Maud Land, East Antarctica?
Martin Olesch, Hans-Jürgen Paech & Imke Behrens:
Failed Charnockitization in Metamorphic Rocks of the Petermannkette in
the Wolthatmassiv, Central Dronning Maud Land, East Antarctica
Wilfried Bauer, Joachim Jacobs & Hans-Jürgen Paech:
Structural Evolution of the Metamorphic Basement of Central Dronning
Maud Land, East Antarctica
Wilfried Bauer & Heinrich Siemes:
Prism Slip in Deformed Quartz in Granulite-Facies Rocks from the
Eastern Orvinfjella, Central Dronning Maud Land, East Antarctica
Wilfried Bauer & Heinrich Siemes:
Kinematics and Geothermometry of Mylonitic Shear Zones in the
Orvinfjella, Central Dronning Maud Land, East Antarctica
Stefanie Meier, Joachim Jacobs & Martin Olesch:
Tectono-thermal Evolution of Central Dronning Maud Land, East
Antarctica, from Mid-Palaeozoic to Cenozoic Times: Zircon and Apatite
Fussion-Track Data from the Conradgebirge and Östliche Petermannkette
Hans-Jürgen Paech:
Geoscientific Interpretation of the Aerial Photographs taken in
Central Dronning Maud Land, East Antarctica
Sandra Piazolo:
Detailed Geological Mapping of the Mramornye Nunataks and the Western
Part of Schirmacheroase, Dronning Maud Land, East Antarctica

Short description top ↑

The papers in this volume cover orthogneisses and the Pan-African granitoids and charnockites, in addition to studies on the regional metamorphism and the structural evolution of central DML.
The crust of central Dronning Maud Land is composed of late Mesoproterozoic metavolcanic and metasedimentary rock sequences which experienced Grenville deformation and metamorphism. Coevally, metaplutonic rocks formed to an unknown extent. These late Mesoproterozoic rocks were pervasively reactivated during the PanAfrican events, almost completely obliterating the Grenville structures. Additionally, during the Pan-African events (600-500 Ma) the metamorphic crust in central Dronning Maud Land was intruded by a huge amount of igneous rock as discordant plutons ranging in composition from anorthosite to granite/syenite, some of which may now be metaplutonic rocks.