A preliminary study on D/H ratios of hornblendes from granites and ultramafic-mafic rocks

Abstract

The δD values of hornblendes from some granites and ultramafic-mafic rocks suggest that the water in granitic magma and the water equilibrated with hornblendes in ultramafic-mafic rocks associated with peridotites seem to be the same with respect to δD values which range from -29 to -37‰. Water contents of hornblendes in ultramafic-mafic rocks are clearly higher than those in granitic rocks. The δD values and water contents of hornblendes from nodules in some alkali basalts and possibly metamorphosed ultramafic-mafic rocks are quite different from those of the rocks mentioned above.