Geochemistry and petrogenesis of mesoproterozoic dykes of the irkutsk promontory, southern part of the Siberian Craton
- Donskaya, T.V. (T. V.)
- Gladkochub, D.P. (D. P.)
- Ernst, R.E. (Richard E.)
- Pisarevsky, S.A. (S. A.)
- Mazukabzov, A.M. (A. M.)
- Demonterova, E.I. (E. I.)
DOIAbstract
We present new geochemical and Nd isotopic data on two Mesoproterozoic Listvyanka (1350 ± 6 Ma) and Goloustnaya (1338 ± 3 Ma) mafic dyke swarms located in the Irkutsk Promontory of the southern part of the Siberian craton. Listvyanka dykes are sub-vertical with NNE trend, while Goloustnaya dykes are characterized by prevailing W trend. Listvyanka and Goloustnaya dykes are composed of medium to coarse grained dolerites. All dolerites correspond to sub-alkaline tholeiitic basalts according to their major-element compositions with lower to moderate mg#, varying from 36 to 54. The trace and rare earth element abundances in Listvyanka and Goloustnaya dolerites are generally close to basalts of the oceanic island basalts (OIB) type. The Listvyank...
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