Abstract
Archaean greenstone belts offer the opportunity to study the dynamic early Earth conditions. The Singhbhum Craton (SC) of India hosts several volcano-sedimentary greenstone sequences that preserve Archaean rocks locally exceeding 3.5 Ga. The Daitari Greenstone Belt (DGB) comprises a well-perpetuated submarine volcano-sedimentary succession of mafic-ultramafic rocks, felsic volcanics dated at c. 3.51 Ga, and intercalated banded chert, shale and iron formation. Common volcanic rocks include komatiite, pillow basalt, and felsic volcaniclastic rocks. Felsic volcanic rocks dating back to c. 3.53-3.51 Ga from the Daitari and Gorumahisani greenstone belts mark a period of widespread felsic magmatic event in the SC. Sedimentary rocks of the DGB are dominated by chemical precipitates of banded black-and white-chert, thinly laminated black chert, banded iron formation and minor siliciclastic rock such as shale. The DGB hosts altered silicified/carbonated volcanic rocks and cherts, an assemblage typical for Palaeoarchaean successions...
Ph.D. (Geology)