Modal Composition and Age of Intrusions in North-central and Northeast Nevada

North-central and northeast Nevada contains numerous large plutons and smaller
stocks but also contains many small, shallowly emplaced intrusive bodies,
including dikes, sills, and intrusive lava dome complexes. Decades of geologic
investigations in the study area demonstrate that many ore deposits,
representing diverse ore deposit types, are spatially, and probably temporally
and genetically, associated with these igneous intrusions. However, despite the
number and importance of igneous instrusions in the study area, no synthesis of
geochemical data available for these rocks has been completed. This report
presents a synthesis of composition and age data for these rocks. The product
represents the first phases of an effort to evaluate the
time-space-compositional evolution of Mesozoic and Cenozoic magmatism in the
study area and identify genetic associations between magmatism and mineralizing
processes in this region.

[Summary provided by the USGS.]