ALPHA This is a new website – your feedback will help us to improve it.

Adelaide Island Intrusive Suite

Description

Typically granodiorite - gabbro hybrid plutons which outcrop widely on the Wright Peninsula and the Mount Gaudry-Mount Mangin region. Pluton compositions become increasingly silicic further north with quartz monzonite and tonalite more abundant. An emplacement age in the range, 45 - 52 Ma, is favoured (Pankhurst, 19821; Griffiths & Oglethorpe, 19982; Riley et al., 20123). Associated with relatively minor dolerite dyke intrusion. D-diorite; G-granite; Ga-gabbro; Gd-granodiorite; QD-quartz diorite; QM-quartz monzonite; To-tonalite.

Age

Eocene (45-52 Ma; U-Pb, fission track)

Map Reference

Riley, T. R., Flowerdew, M. J. & Haselwimmer, C. E. Geological Map of Adelaide Island, Graham Land (1:200 000 scale). Sheet 2, (British Antarctic Survey, 2011). Available here.

References

  1. Pankhurst, R. J. Rb-Sr geochronology of Graham Land, Antarctica. J. Geol. Soc. 139, 701–711 (1982). ↩

  2. Griffiths, C. J. & Oglethorpe, R. D. The stratigraphy and geochronology of Adelaide Island. Antarct. Sci. 10, 462–475 (1998). ↩

  3. Riley, T. R., Flowerdew, M. J. & Whitehouse, M. J. Chrono-and lithostratigraphy of a Mesozoic–Tertiary fore-to intra-arc basin: Adelaide Island, Antarctic Peninsula. Geol. Mag. 149, 768–782 (2012). ↩