Late Cretaceous mafic dykes in the Dharwar craton |
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Authors: | Anil Kumar Y J Bhaskar Rao V M Padma Kumari A M Dayal K Gopalan |
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Institution: | (1) National Geophysical Research Institute, 500007 Hyderabad, India |
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Abstract: | Palaeomagnetic, geochemical and geochronological studies have been conducted on a set of dolerite dykes intruding the Peninsular
gneisses near Huliyurdurga town, Karnataka, as a reconnaissance survey indicated a Cretaceous age for them. The dykes are
mainly tholeiitic in composition with their 87Sr/86Sr ratios tightly clustered around 0·7045. Their palaeomagnetic data (D
m
=329°,I
m
=−55°) and the corresponding palaeopole coordinates (λ
p
= 34°S,L
p
=108°E) are strikingly close to those of the Deccan Traps to the north. Whole rock K-Ar ages of these dykes ranging between
69 and 84 Ma are also similar to the range of K-Ar ages of the Deccan basalts. The chemical, palaeomagnetic and temporal coherence
between the dykes and the Deccan basalts indicate that they may indeed be tectonically related events. |
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Keywords: | Cretaceous dykes Deccan volcanism geochronology geochemistry Palaeomagnetism |
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