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- W2000519921 abstract "Abstract The Proterozoic lithostratigraphic units of the Mozambique Belt in Tanzania constitute the multiply deformed and polymetamorphic Usagaran terrane. They are characterized by major horizontal displacements which led to thrusting and repetition of stratigraphic sequences. Rb-Sr, U-Pb, and K-Ar ages vary between 2750 and 538 Ma, and are interpreted as representing tectonothermal reworking of Early Proterozoic Usagaran rocks during the Late Proterozoic to Early Palaeozoic Pan-African event. The Usagaran rocks display open to isoclinal folds with rounded to angular limbs, boudinage, compositional banding, flattened and stretched minerals, and protomylonitic foliations. The degree of metamorphism in the Usagaran increases from amphibolite- to granulite-facies grade as one moves eastwards or southeastwards. The Pan-African tectonic zones of high permeability provided access to fluid phases and heat, leading to the emplacement of pegmatites through partial melting, recrystallization, and selective leaching of trace elements from the underlying lithostratigraphic units. Gemstone mineralizations of these metamorphic terranes in Tanzania are formed either by metamorphic-hydrothermal processes or in connection with pegmatites and silicic vein rocks along fault zones." @default.
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- W2000519921 title "Tectonic setting of gemstone mineralization in the Proterozoic metamorphic terrane of the Mozambique Belt in Tanzania" @default.
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- W2000519921 doi "https://doi.org/10.1016/0301-9268(90)90071-w" @default.
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