A stable isotope study of the southern White Pine Range, East-Central Nevada

Stable isotope results indicate a complex history of hydrothermal activity during brittle deformation and magma intrusion into the lower plate of the recently defined Currant Gap detachment fault at the southern White Pine Range, East-Central Nevada Circulation of large amounts of meteoric-hydrothermal fluids through the entire complex is indicated by (1) low muscovite deltaD values from altered intrusive rocks, (2) low vein calcite delta18 O values from the upper plate, (3) lower plate vein calcite delta 18O values as low as -4.4&permil, and (4) low vein and host-rock calcite delta18O values within the detachment fault zone. High biotite deltaD values from some intrusions and the high delta 18O values of some veins proximal to the sills indicate the involvement of magmatic waters. Higher and less variable host-rock carbonate delta 18O values suggest a channelized fracture-controlled flow system during detachment faulting.