Estimations of Clarkes for Carbonaceous biolithes: World averages for trace element contents in black shales and coals

International Journal of Coal Geology - Tập 78 - Trang 135-148 - 2009
M.P. Ketris1, Ya.E. Yudovich1
1Institute of Geology, Komi Scientific Center, Ural Branch of the Russian Academy of Sciences, 167023 Syktyvkar, Morozova st., 100, ap. 49, Russia

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