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Geological Society, London, Special Publications; 2009; v. 324; p. 317-330;
DOI: 10.1144/SP324.21
© 2009 Geological Society of London

Part II: Applied thermochronology - long-term evolution studies

Combined titanite and apatite fission-track data from Gjelsvikfjella, East Antarctica – another piece of a concealed intracontinental Permo-Triassic Gondwana rift basin?

B. Emmel1,*, J. Jacobs1,2 & M. C. Daszinnies1

1 Fachbereich Geowissenschaften, Universität Bremen, PF 330440, 28334 Bremen, Germany
2 Department of Earth Science, University of Bergen, Allegaten 41, 5007 Bergen, Norway

* Corresponding author (e-mail: emmel{at}uni-bremen.de)

Titanite and apatite fission-track ages from Gjelsvikfjella and the eastern Mühlig–Hofmann Mountains, East Antarctica, range between 516±50 and 323±30 Ma and 366±16 and 186±9 Ma, respectively. The thermochronological data set indicates differential cooling of two tectonic blocks (Hochlinfjellet–Festninga and Risemedet). Inverse modelled time–temperature paths suggest that the Hochlinfjellet–Festninga block cooled at first below 60 °C during the mid-Palaeozoic, whereas the Risemedet block cooled during the earliest Triassic. Differential cooling is most probably related to physical separation along active faults, which is associated with Gondwana-wide intracontinental rifting. This tectonic activity shaped the landscape in the study area along structures running perpendicular to the continental margin of Dronning Maud Land. A rift locus was possibly located along the Penck–Jutul graben west of the study area. In contrast to other parts of Dronning Maud Land, Jurassic magmatism and initial break-up between East Africa and East Antarctica did not influence the apatite FT data. Modelled apatite fission-track data indicate the onset of final cooling since the Early Cretaceous, suggesting post-Cretaceous unroofing of the palaeosurfaces in eastern Dronning Maud Land.





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F. Lisker, B. Ventura, and U. A. Glasmacher
Apatite thermochronology in modern geology
Geological Society, London, Special Publications, 2009; 324: 1 - 23.
[Abstract] [Full Text] [PDF]