Metamorphic history of skarns, origin of their protolith and implication for genetic interpretation; an example from three units of the Bohemian Massif
2009
Abstract
Skarns in the Svratka Unit, in the neighbouring part of the Moldanubian Zone and in the Kutná Hora Complex were studied with respect to their tectonometamorphic evolution, geochemistry of the major and trace elements, stable isotope geochemistry and zircon ages. The geological positions of skarns, and their structural and metamorphic record probably reflect common tectono-metamorphic evolution with that of the surroundings rocks.
The geochemical characteristics, values of the oxygen isotopes and the presence of detrital zircons with a wide range of ages exclude a metasomatic origin of the skarns and point to a sedimentary-exhalative protoliths.