Major- and Trace-Element Concentrations in Rock Samples Collected in 2004 from the Taylor Mountains 1:250,000-scale Quadrangle, Alaska

Precious-metal and related deposits in this region associated with Late Cretaceous to early Tertiary igneous complexes extend into the Taylor Mountains 1:250,000-scale quadrangle. The U.S. Geological Survey is conducting geologic mapping and a mineral resource assessment of this area that will provide a better understanding of the geologic framework, regional geochemistry, and may provide targets for mineral exploration and development.

During the 2004 field season 137 rock samples were collected for a variety of purposes. All samples were analyzed for a suite of 42 trace-elements to provide data for use in geochemical exploration as well as some baseline data. Selected samples were analyzed by additional methods; 104 targeted geochemical exploration samples were analyzed for gold, arsenic, and mercury; 21 of these samples were also analyzed to obtain concentrations of 10 loosely bound metals; 33 rock samples were analyzed for major element oxides to support the regional mapping program, of which 28 sedimentary rock samples were also analyzed for total carbon, and carbonate carbon.