EXPERIMENTAL STUDIES ON BEHAVIORS OF LANTHANIDES IN INTERACTION BETWEEN WATER AND BASALTIC ROCK GRAINS - BEARINGS OF TETRAD EFFECT ON CONDITIONS

The behavior of rare earth elements (REE) in interaction between water and basalt; was investigated on different conditions. The W-type tetr ad effect was observed for water under gentle environment at room temp erature. The REE pattern, having tetrad effect and negative Ce anomaly , is similar to that of seawater. On the other hand, the REE patterns of waters resulting from violent environment, i.e., at high temperatur e (70 degrees C) or under operation of supersonic waves, show smooth c urve with little if any tetrad effect, rather resembling that of sourc e basalt. It is noted that the tetrad effect often observed in natural waters also appears in simple interaction in situ between pure distil led water and basalt. This results would throw light on understanding of tetrad effects observed in natural waters.