State Key Laboratory of Ore Deposit Geochemistry;
Instituteof Geochemistry;
Chinese Academy of Sciences;
Guiyang 550081;
China;
Department of Geological Services;
Ogun State Ministry of Commerce and Industry;
Oke-Mosan;
Abeokuta;
Nigeria;
University of Chinese Academy of Sciences;
Beijing 100049;
China;
State Key Laboratory of Environmental Geochemistry;
Institute of Geochemistry;
Chinese Academy of Sciences;
Guiyang 550081;
China;
Department of Science Laboratory Technology;
Ekiti StateUniversity;
Ado-Ekiti;
Ekiti State;
Nigeria;