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Geologie Mosambiku

21.09.2008
Geologie
Geologie Mosambiku
Mozambique’s geology is highly varied:

The south western, central and northeastern provinces consist mainly of Precambrian terrains (ranging from Archaean to Upper Proterozoic rocks) covered predominantly in the south and east by Phanerozoic (ranging from Jurassic through to Tertiary) sedimentary rocks.  

Mozambique is located over the eastern margin of the African continent.  The terrane alongside the western border with Zimbabwe is an extension of the Zimbabwe Craton, dominated by Archaean granitic gneiss complexes, with subordinate ‘greenstone’ belts and widely separated, shallow Palaeo-Proterozoic sedimentary basins. The eastern margin of these rocks was re-tectonised during the Meso-Proterozoic Era (approximately 1700-1350 Ma). Baobab’s Licence Areas in the greater Manica region occur over these rock units.  The Meso-Neoproterozoic terrane that characterizes the Greater Tete Region, where Baobab’s other Licence Areas occur, reflects an inter-cratonic environment (between the Zimbabwe and Bangweulu or Congo Cratons). The Zambezia, Nampula, and Niassa Provinces consist dominantly of re-tectonised (1700-1350 Ma) Proterozoic gneissic terrane. 

The Great East African rifting event (170 Ma) that is partly occupied by major lakes such as Lake Malawi, and its associated ‘branches’, have their southward, along-strike extensions in Mozambique. These have typically been filled by the Karoo System terrigenous sediments and volcanism associated with the end of the Karoo sedimentation. Much of the coastal plain that dominates the central and southern parts of the country was laid down during the Cretaceous (136-65 Ma). Finally, a phase of rifting from 35-5 Ma occurred. Baobab’s exploration areas are not located in such features, which are of interest for such commodities as coal and natural gas.

ZDROJ: Baobab res., kráceno

Map 5

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