Element re-distribution and mobilisation during late-stage granite solidification and hydrothermal alteration: Evidence from easily accessible fractions of metals and O, H isotope composition of granites from the Black Forest, Germany

O and H isotope compositions of biotite and feldspar and whole rock chemica l composition are found to correlated with the (e) under bar asily (a) unde r bar ccessible fractions of (t) under bar race elements in rocks (EAT). Th e latter is determined by controlled acid-leaching of rock powders. In diag rams where element contents or isotopic compositions are plotted against th e EAT's two trends are observed: (i) A main trend common to all studied plu tons with insignificant changes of isotope ratios and (ii) significant "ind ividual" trends between the EAT's and isotope ratios. The former changes ar e attributed to high temperature interactions with mainly endogenic fluids, whereas the individual trends reflect interactions with exogenic fluids of variable chemical and isotopic composition. In the studied granites from the Black Forest/Germany the content of Rb inc reases, whereas Ca, Fe, Sr, and Ba contents decrease during the final state of granite solidification. These element changes are accompanied by increa ses of EAT fractions for Fe, Ca, Rb, and Sr and decreases for Ba with minor variation in O and H isotope ratios. In the hydrothermal reaction the EAT fractions increase or decrease depending on local conditions of the alterat ion of granites. EAT fractions of elements correlate with the degree of hyd rothermal overprinting as deduced from stable isotope compositions and show that (i) hydrothermal alteration strongly affects the elemental distributi on and that (ii) rocks are leached and possibly contribute to ore deposits. In the granite suite of the southern Schwarzwald - ranging from autochthono us biotite granites to allochthonous two mica granites - the complete histo ry of fluid overprinting from late-stage crystallisation to low-temperature hydrothermal alteration is preserved.