The geochemistry of Archaean plagioclase-rich granites as a marker of source enrichment and depth of melting
Published:October 01, 2010
J.-F. Moyen, D. Champion, R. H. Smithies, 2010. "The geochemistry of Archaean plagioclase-rich granites as a marker of source enrichment and depth of melting", Sixth Hutton Symposium on The Origin of Granites and Related Rocks: Proceedings of a Symposium held in Stellenbosch, South Africa, 2- 6 July 2007, John D. Clemens, Colin Donaldson, Carol D. Frost, Alexander F.M. Kisters, Jean-François Moyen, Tracy Rushmer, Gary Stevens
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In geochemical diagrams, granitoids define ‘trends’ that reflect increasing differentiation or melting degree. The position of an individual sample in such a trend, whilst linked to the temperature of equilibration, is difficult to interpret. On the other hand, the positions of the trends within the geochemical space (and not the position of a sample within a trend) carry important genetic information, as they reflect the nature of the source (degree of enrichment) and the depth of melting. This paper discusses the interpretation of geochemical trends, to extract information relating to the sources of granitoid magmas and the depth of melting....