Évaluation du potentiel métallogénique de la ceinture de roches vertes de Nuggihalli, Sud de l'Inde
Abstract
Chromite from the north-south-trending schist belt of Nuggihalli (southern Karnataka), belonging to the greenstone belt of South India (3.0-3.5 Ga) and crystallising at 1178 °C under oxygen fugacity of -6.67 shows komatiitic affinity. The chemical data of the Cr-spinels when plotted in the form of the discriminant function of Johan (1979) show a remarkable follow-up of the curve A, which delineates the boundary between the 'barren' and 'fertile' (with respect to the plausible presence of sulphide phases) Cr-spinel bodies. Only a few samples plot marginally within the barren region (Fig. 1), suggesting that the chromite bands should hardly hold the possibility of becoming host of sulphide mineralisation of commercial relevance.
- Publication:
-
Comptes Rendus Geoscience
- Pub Date:
- January 2003
- DOI:
- 10.1016/S1631-0713(03)00034-8
- Bibcode:
- 2003CRGeo.335..185M