%0 Journal Article
%A Mantilla Figueroa, Luis Carlos
%A Casquet Martín, César
%A Mas Mayoral, José Ramón
%T Comparación entre el metamorfismo de la Cuenca de Cameros yel de la Cuenca Aurifera de Witwatersrand (Suráfrica). Implicaciones Metalogenéticas
%D 1999
%@ 0213-683X
%U https://hdl.handle.net/20.500.14352/56939
%X The Witwatersrand Coldfield (WCF) and the Cameros Basin (CB) were subjected to widespread fluid flowduring metamorphism. Physical conditions reached at the thermal peaks have been estimated at 1 kb and340°C in the case of the CB and 1-2kb and 350 ± 50°C in the WCF (i.e. subgreenschist and greenschistfacies conditions). In both cases the infiltrating fluids were predominantly of deep intra-basinal andmetamorphic origin and the fluid flow was focused along zones of enhanced permeability (pervasivecleavage, shear zones, fractures and bedding). Phyrophillite and chloritoid are common minerals in theinternal parts of the metamorphic areas. Cold and U, accompanied by organic matter, were introducedlate in the WCF; In the CB no evidence still exist of this economically important eventoIn the two basins, metamorphism is post-depositional, 300 to 600 Ma younger in the Archean WCF, andinmediatly subsequent in the case of the Mesozoic CB . In this case a relationship with a first stage ofbasin inversion seems probable.The many similarities between metamorphism in the two basins and the new model of hot migratingfluid-driven metamorphism invoked in both cases, open room for new prospecting strategies of metals ofechonomic interest in the CB.
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