SHRIMP U-Pb zircon data from Gjelsvikfjella, Dronning Maud Land, East Antarctica ...

• Main Authors: Bisnath, Avinash, Frimmel, Hartwig E, Armstrong, Robert A, Board, W S
• Format: Article in Journal/Newspaper
• Language: English
• Published: PANGAEA 2006
• Subjects: Rock sample; Priority Programme 1158 Antarctic Research with Comparable Investigations in Arctic Sea Ice Areas SPP1158; Antarc*; Antarctic; Antarctica; Dronning Maud Land; East Antarctica; Sea ice
• Online Access: https://dx.doi.org/10.1594/pangaea.847015; https://doi.pangaea.de/10.1594/PANGAEA.847015

The Maud Belt in Dronning Maud Land (western East Antarctic Craton) preserves a high-grade polyphase tectono-thermal history with two orogenic episodes of Mesoproterozoic (1.2-1.0 Ga) and Neoproterozoic (0.6-0.5 Ga) age. New SHRIMP U-Pb zircon data from southern Gjelsvikfjella in the northeastern part of the belt make it possible to differentiate between a series of magmatic and metamorphic events. The oldest event recorded is the formation of an extensive 1140-1130 Ma volcanic arc. This was followed by 1104 ± 8 Ma granitoids that might represent, together with so far undated mafic dykes, part of a decompression melting-related bimodal suite that reflects the sub-continental Umkondo igneous event. The first high-grade metamorphism is constrained at 1070 Ma. The metamorphic age data are similar to those obtained from other parts of the Maud Belt, but also from the Namaqua-Natal Belt in South Africa, but the preceding arc formation was diachronous in the two belts. This indicates that the two belts did not ... : Supplement to: Bisnath, Avinash; Frimmel, Hartwig E; Armstrong, Robert A; Board, W S (2006): Tectono-thermal evolution of the Maud Belt: New SHRIMP U–Pb zircon data from Gjelsvikfjella, Dronning Maud Land, East Antarctica. Precambrian Research, 150(1-2), 95-121 ...