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vol.25 número1The age and constitution of Cerro Campanario, a mafic stratovolcano in the Andes of Central ChileThe Ostracod genus Majungaella Grekoff in Argentina índice de autoresíndice de assuntospesquisa de artigos
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Revista geológica de Chile

versão impressa ISSN 0716-0208

Resumo

BARRA, Fernando et al. Serpentinitas y cromititas de La Cabaña, Cordillera de la Costa, Chile central. Rev. geol. Chile [online]. 1998, vol.25, n.1, pp.29-44. ISSN 0716-0208.  http://dx.doi.org/10.4067/S0716-02081998000100003.

ABSTRACT Serpentinites and chromitites from La Cabaña, Coastal Range of Central Chile. Serpentinites in the La Cabaña area are part of the Western Series of the Coastal Range Metamorphic Basament of the IX Region, Chile. They consist of partially to completely serpentinized coarse grain dunites. Chromite occurs as an accessory mineral in the serpentinites, where it is variably altered to ferrichromite. In contrast, chromites found in chromitites at Centinela Bajo, have preserved their original composition with only minor alteration, and can thus be used as petrotectonic indicators. Values of 'chromium number' (#Cr-Cr/Cr+Al) in the range of 0.65-0.90 and 'magnesium number' (#Mg=Mg/Mg+Fe+2) in the range of 0.40-0.70, suggest an island arc environment for the emplacement of the peridotites.

Palavras-chave : Petrogenetic indicator; Mineralogy; Geochemistry; Chromites; Metamorphic Basement; Coastal Ranges.

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