CHLORINE CONTENT IN MAGMATIC MELTS ACCORDING TO MINERAL INCLUSION DATA

Data on chlorine content are summarised on the base of 363 determinations of chlorine and main rockfonning elements obtained from analytical measurements of homogeneous melt inclusions. It was found that the chlorine contents are sufficiently above previous estimates. Basic and ultrabasic magmas (SiO2 < 53%) contain 0.132 wt% of Cl (average of 87 determinations within 0.00 up to 0.41% range); intermediate magmas (SiO2 = 53-64%) - 0.224 wt% (average of 59 determinations within 0.00 - 1.20%); acidic magmas (SiO2 > 64% - 0.258 wt% (average of 217 determinations within 0.00 - 1.13%). The average chlorine content of all magmatic types is estimated as 0.226 wt%. Taking into account the abundances of different magmatic types at continents it was estimated as 0.176 wt% for the continental block as a whole, whereas the average chlorine content of continents, continental mal gins and oceanic bottom is corresponding to 0.142. wt%.