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Statistical analyses of minorand trace-element geochemical data for 6,974 rock samples from the Petersburg quadrangle and minor parts of the Port Alexander, Sitka, and Sumdum quadrangles (hereafter referred to as the Petersburg study area) identified 887 samples with anomalously high concentrations of one or more elements. This report includes a list of the 887 samples (table 1), histograms showing the distribution of chemical values (see fig. 2), a brief description of the geologic context and distribution of the samples, a map of bedrock geochemical groups (sheet 1), and 12 maps showing the locations of samples that have anomalous amounts of precious metals, base metals, and selected rare metals (sheets 2-7). The information presented here is intended to be used in conjunction with the geologic map of the Petersburg study area (Brew and others, 1984), the geochemical data for all of the Petersburg study area rock samples (Karl and others, 1985), the geochemical data for all the Petersburg study area stream-sediment samples (Cathrall and others, 1983a-w), and a description of the known mineral deposits and occurrences in the study area (Grybeck and others, 1984). The rock geochemical data for all samples collected in the study area is also available on a computer tape (Koch and others, 1984).

miscellaneous field studies map

Maps and preliminary interpretation of anomalous rock geochemical data from the Petersburg quadrangle and parts of the Port Alexander, Sitka, and Sumdum quadrangles, southeastern Alaska