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- W2049173580 abstract "RbSr analyses of leached phlogopite macrocrysts from kimberlite pipes 1, 2, 5 and 7 in south India give concordant ages of 1091±20, 1092±15, 1093±20 and 1091±10 Ma, respectively, indicating contemporaneous emplacement of these pipes. The present results are in contradiction with earlier measurements. Groundmass mineral assemblages with low RbSr ratios give a tight set of initial Sr ratios at 0.7029±2, 0.7019±2, 0.7029±2 and 0.7030±4 suggesting derivation of the primary kimberlite magma from a relatively uniform and depleted mantle source. A similar age and initial Sr isotopic ratio of one sample of the Majhgawan lamproite from Central India imply that the Proterozoic kimberlite/lamproite activities in India, though widely separated in space, were nearly contemporaneous." @default.
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- W2049173580 date "1993-06-01" @default.
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- W2049173580 title "RbSr ages of Proterozoic kimberlites of India: evidence for contemporaneous emplacement" @default.
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- W2049173580 doi "https://doi.org/10.1016/0301-9268(93)90023-u" @default.
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