Abstract
Specific gravities of a series of gabbroic rocks and their metamorphic equivalents are compared with their major-element compositions using the Gresens equation. Care was taken to assure a close parent-daughter rock match by careful field control and by applying composition-volume screening. The study indicates that correct matching of protoliths with their metamorphic derivatives is the limiting factor deciding the accuracy of volume effect determinations. The metamorphic transition is consistent with a constant-SiO 2,-TiO 2,-Al 2O 3,-FeO★,-MgO model. A small but well-defined volume increase of 2% is indicated.
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