The Bushveld complex A quick presentation.

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Presentation transcript:

The Bushveld complex A quick presentation

The Bushveld Complex, South Africa The biggest: 300-400 km x 9 km The Red Granite intruded 50-100 Ma afterwards Figure 12-5. Simplified geologic Map and cross section of the Bushveld complex. After Willemse (1964), Wager and Brown (1968), and Irvine et al. (1983).

Bushveld Complex The World’s Biggest Layered Igneous Intrusion Floor LZ LCZ UCZ MZ UZ Panorama of the Olifants River Valley, NE Bushveld Jodie’s lecture - 2006

Jodie’s lecture - 2006

Intrusive sill of Bushveld dolerite in Transvaal sequence Near Burgersfort

Lower zone Peridotites/pyroxenites (Jagdlust, Burgersfort-Polokwane Road)

Lower zone Peridotites/pyroxenites (Jagdlust, Burgersfort-Polokwane Road)

The critical zone overlooking the lower zone (left) (Burgersfort-Polokwane Road)

Different pyroxenite types, Critical zone (Mandaagshoek, near Burgersfort)

Norite and anorthosite, Critical zone (Mandaagshoek, near Burgersfort)

Layered anorthosite, Critical zone (Tweefontein, Lydenburg-Burgersfort area)

Anorthosite and chromitite, Critical zone (Dwars River, Lydenburg-Burgersfort area)

UG3 Chromitite, Critical zone (Mandaagshoek, near Burgersfort)

Massive black gabbros (« Belfast black »), Main zone (Near Stoffberg, Belfast area)

Modal layering in gabbros, Main zone (Lydenburg-Burgersfort area)

Gabbros and magnetite (Main Magnetite Layer), Upper zone (Magnet Heights)

Upper zone gabbronorite (Magnet Heights)

Main magnetite layer, Upper zone (Magnet Heights)

In-situ differentiation Or successive magma batches?

Isotopic evolution ISr(2.05 Ga)