Late cretaceous mafic dykes in the Dharwar craton

Anil Kumar, ; Bhaskar Rao, Y. J. ; Padma Kumari, V. M. ; Dayal, A. M. ; Gopalan, K. (1988) Late cretaceous mafic dykes in the Dharwar craton Proceedings of the Indian Academy of Sciences - Earth and Planetary Sciences, 97 (1). pp. 107-114. ISSN 0253-4126

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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 (λp = 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.

Item Type:Article
Source:Copyright of this article belongs to Indian Academy of Sciences.
Keywords:Cretaceous Dykes; Deccan Volcanism; Geochronology; Geochemistry; Palaeomagnetism
ID Code:634
Deposited On:23 Sep 2010 08:19
Last Modified:16 May 2016 11:50

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