East Antarctic crustal evolution: geological constraints and modelling in western Dronning Maud Land

Groenewald, P. B.; Moyes, A.B.; Grantham, G.H.; Krynauw, J. R.

doi:10.1016/0301-9268(95)80008-6

Cited by 84 publications

(50 citation statements)

References 24 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Later exhumation, brittle faulting and intrusion of mafic dykes are related to Permo-Triassic removal of crustal material and breakup of Gondwana around 200 Ma (e.g. Groenewald et al 1995;S. Meier, unpub.…”

Section: A Pan-african Near-isothermal Uplift During Tectonic Extementioning

confidence: 99%

“…In Lützow Holmbukta (c. 40 • E, 69 • S) the crust was uplifted from c. 11 to 4 kbar under near-isothermal decompression for a period of 20 ± 10 Myr during the late Pan-African event (Fraser et al 2000). In western Dronning Maud Land, a major shear zone near Heimefrontfjella (10 • W) separates the little-affected Mesoproterozoic crust of western Dronning Maud Land (Groenewald et al 1995;Jacobs et al 1996) from the Pan-African overprinted central Dronning Maud Land. In this area Groenewald et al (1995) reported a major uplift and exhumation around 500 Ma.…”

Section: B Late-orogenic Collapse Of the Pan-african East Antarctimentioning

confidence: 99%

“…In western Dronning Maud Land, a major shear zone near Heimefrontfjella (10 • W) separates the little-affected Mesoproterozoic crust of western Dronning Maud Land (Groenewald et al 1995;Jacobs et al 1996) from the Pan-African overprinted central Dronning Maud Land. In this area Groenewald et al (1995) reported a major uplift and exhumation around 500 Ma. Jacobs et al (2003) reported Pan-African extensional structures in the Wohlthatmassiv of central Dronning Maud Land (12 • E) and suggested that orogenic collapse had occurred.…”

Section: B Late-orogenic Collapse Of the Pan-african East Antarctimentioning

confidence: 99%

See 2 more Smart Citations

Pan-African extension and near-isothermal exhumation of a granulite facies terrain, Dronning Maud Land, Antarctica

Engvik

Elvevold

2004

Geol. Mag.

View full text Add to dashboard Cite

-The Mühlig-Hofmann-and Filchnerfjella in central Dronning Maud Land, Antarctica, consist of series of granitoid igneous rocks emplaced in granulite and upper amphibolite facies metamorphic rocks. The area has experienced high-temperature metamorphism followed by near-isothermal decompression, partial crustal melting, voluminous magmatism and extensional exhumation during the later phase of the late Neoproterozoic to Cambrian Pan-African event. Remnants of kyanitegarnet-ferritschermakite-rutile assemblages indicate an early higher-pressure metamorphism and crustal overthickening. The gneisses experienced peak granulite facies temperatures of 800-900 • C at intermediate pressures. Breakdown of garnet + sillimanite + spinel-bearing assemblages to cordierite shows subsequent re-equilibration to lower pressures. An E-W foliation dominating the gneisses illustrates transposition of migmatites and leucocratic melts which evolved during the near-isothermal decompression. Occurrence of extensional shear bands and shear zones evolving from the ductile partial melting stage through semiductile towards brittle conditions, shows that the uplift persisted towards brittle crustal conditions under tectonic W/SW-vergent extension. Late-orogenic Pan-African quartz syenites intruded after formation of the main gneiss fabric contain narrow semiductile to brittle shear zones, illustrating that the extensional exhumation continued also after their emplacement. The latest record of the Pan-African event is late-magmatic fluid infiltration around 350-400 • C and 2 kbar. At this stage the Pan-African crust had undergone 15-20 km exhumation from the peak granulite facies conditions. We conclude that the later phase of the Pan-African event in central Dronning Maud Land is characterized by a near-isothermal decompression P-T path and extensional structures indicating tectonic exhumation, which is most likely related to a late-orogenic collapsing phase of the Pan-African orogen.

show abstract

Section: A Pan-african Near-isothermal Uplift During Tectonic Extementioning

confidence: 99%

Section: B Late-orogenic Collapse Of the Pan-african East Antarctimentioning

confidence: 99%

Section: B Late-orogenic Collapse Of the Pan-african East Antarctimentioning

confidence: 99%

See 1 more Smart Citation

Pan-African extension and near-isothermal exhumation of a granulite facies terrain, Dronning Maud Land, Antarctica

Engvik

Elvevold

2004

Geol. Mag.

View full text Add to dashboard Cite

show abstract

“…The Pencksökket and Jutulstraumen glaciers conceal a major crustal boundary between two distinctive terranes within WDML: the Grunehogna and Maudheim Provinces (Groenewald, Moyes, Grantham, & Krynauw, 1995;Moyes, Krynauw , & Barton, 1995). At least three major rock units of differing age can be found within these two provinces ( Fig.…”

Section: Geologymentioning

confidence: 97%

“…It consists of ~3 Ga granitic basement rocks overlain by an undeformed ~1.2 Ga sequence of sedimentary and volcanic rocks known as the Ritscherflya Supergroup (Groenewald et al, 1995;Moyes et al, 1995). This has been interpreted as a sequence of shallow marine, tidal and alluvial fan deposits, into which numerous tholeiitic sills are intruded, dated to ~1.1 Ga and which is capped by the Straumsnutane lavas of a similar age Wolmarans & Kent, 1982).…”

Section: Grunehogna Provincementioning

confidence: 99%

The surficial and subglacial geomorphology of western Dronning Maud Land, Antarctica

et al. 2015

View full text Add to dashboard Cite

The full-text may be used and/or reproduced, and given to third parties in any format or medium, without prior permission or charge, for personal research or study, educational, or not-for-prot purposes provided that:• a full bibliographic reference is made to the original source • a link is made to the metadata record in DRO • the full-text is not changed in any way The full-text must not be sold in any format or medium without the formal permission of the copyright holders.Please consult the full DRO policy for further details.

show abstract

Reassembling Gondwana: A new high quality constraint from vibroseis exploration of the sub‐ice shelf geology of the East Antarctic continental margin

et al. 2014

View full text Add to dashboard Cite

The breakup of Gondwana is manifested by coeval early Jurassic Karoo magmatism in South Africa and East Antarctica. In South Africa, the large volumes of volcanic rocks of the adjoining Lebombo and Mwenetzi-Save monoclines represent a volcanic rift margin, and in East Antarctica, a corresponding feature, the Explora Wedge is buried below sediments and floating ice shelves on the continental margin of Dronning Maud Land. We use the seismic vibrator source to explore the sub-ice geology in Antarctica, and the new seismic reflection and available regional aeromagnetic data enable us to outline a dogleg landward extent of the Explora Wedge in Dronning Maud Land. The congruent inboard wedge geometries on the two continents define a high quality constraint, which facilitate for the first time, a geologically consistent and tight reconstruction of Africa relative to East Antarctica within Gondwana. The uncertainties in correlations of major geological features (mobile belts) from one continent to the other may now be of the order of ten's of kilometers rather than hundreds of kilometers.

show abstract

East Antarctic crustal evolution: geological constraints and modelling in western Dronning Maud Land

Cited by 84 publications

References 24 publications

Pan-African extension and near-isothermal exhumation of a granulite facies terrain, Dronning Maud Land, Antarctica

Pan-African extension and near-isothermal exhumation of a granulite facies terrain, Dronning Maud Land, Antarctica

The surficial and subglacial geomorphology of western Dronning Maud Land, Antarctica

Reassembling Gondwana: A new high quality constraint from vibroseis exploration of the sub‐ice shelf geology of the East Antarctic continental margin

Contact Info

Product

Resources

About