La Unión pluton (LUP) belongs to the metamorphic and igneous Sula Terrane (ST) of Central Guatemala, limited north by Motagua fault (MF) south Jocotán-Chamelecón system (J-CH-FS). The basement ST is characterized high-grade rocks belonging Las Ovejas Complex extensive low-grade San Diego phyllite, latter in tectonic contact with LUP. A combination field data, petrographic geochemical analyses a...