Modelling of REE data indicates that while mafic rocks of Dhanjori Group are partial melting products of a spinel Iherzolite source, Dalma ultrabasics are the residue after the melt-extraction from an original garnet Iherzolite rock. Ultramafics of Newer dolente dykes indicate either derivation by mantle meta somatism or effect of post magmatic serpentinisation. REE data in conjunction with the available geochronological data suggest that significant mantle heterogeneity existed over relatively smaller distances (∼100 km) even during Proterozoic and that the mantle evolved in a non-uniform manner with distinct localised processes.
|Number of pages||10|
|Journal||Journal of the Geological Society of India|
|Publication status||Published - 1997 Dec|
- Mantle Heterogeneity
- REE Geochemistry
- Singhbhum Craton
ASJC Scopus subject areas