US EPA

7475626 

Journal Article 

Precambrian picritic pillow lavas from Nomira, Keonjhar, eastern India 

Bose, MK 

1982 

Yes 

Current Science
ISSN: 0011-3891
EISSN: 0011-3905 

51 

14 

677-684 

English 

WOS:A1982PF81900002 

https://www.jstor.org/stable/24087695
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Pillowed picritic lavas are developed near Nomira at the base of Precambrian banded iron-formation (BIF), flanking the Archaean sialic platform of Singhbhum-Keonjhar in Eastern India. The pillow lavas are characterised by olivine pseudomorph, skeletal or radiating amphibole blades and interstitial fibrolamellar chlorite (largely secondary after glass) in variable proportions. The pillow interstices simulate vitric tuffs though largely silicified. The lavas show limited compositional variation, in bulk approaching picrite. The marginal parts of pillow are comparable to high magnesian basalt. Such hypermagnesian lava, developed on the floor of Proterozoic back-arc basin of Singhbhum, documents the role of active mantle from the very inception of the basin.