Publication: Comparación entre el metamorfismo de la Cuenca de Cameros y
el de la Cuenca Aurifera de Witwatersrand (Suráfrica). Implicaciones Metalogenéticas
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Publication Date
1999
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Sociedad Geológica de España
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Abstract
The Witwatersrand Coldfield (WCF) and the Cameros Basin (CB) were subjected to widespread fluid flow
during metamorphism. Physical conditions reached at the thermal peaks have been estimated at 1 kb and
340°C in the case of the CB and 1-2kb and 350 ± 50°C in the WCF (i.e. subgreenschist and greenschist
facies conditions). In both cases the infiltrating fluids were predominantly of deep intra-basinal and
metamorphic origin and the fluid flow was focused along zones of enhanced permeability (pervasive
cleavage, shear zones, fractures and bedding). Phyrophillite and chloritoid are common minerals in the
internal parts of the metamorphic areas. Cold and U, accompanied by organic matter, were introduced
late in the WCF; In the CB no evidence still exist of this economically important evento
In the two basins, metamorphism is post-depositional, 300 to 600 Ma younger in the Archean WCF, and
inmediatly subsequent in the case of the Mesozoic CB . In this case a relationship with a first stage of
basin inversion seems probable.
The many similarities between metamorphism in the two basins and the new model of hot migrating
fluid-driven metamorphism invoked in both cases, open room for new prospecting strategies of metals of
echonomic interest in the CB.