Lead Isotope Database of Unpublished Results from Sulfide Mineral Occurrences California, Idaho, Oregon, and Washington

摘要

This report discusses the lead (Pb) isotope database for sulfide deposits and occurrences in the Western United States. The primary objectives of the project were three-fold: To utilize Pb isotope signatures, in conjunction with the regional mapping, to assess the relative ages and to categorize the types of deposits studied; To relate the Pb isotope and trace-element geochemical signatures of specific deposits and occurrences to ore-forming processes, and To use the Pb isotope data to correlate lithotectonic terranes within the northern Cordillera. The report by Church and others (1987b) shows how this fingerprinting methodology can be applied to trace the offset of lithostratigraphic terranes. The Pb isotopic data presented in tables 1-4 represent the work completed on sulfide mineral deposits located in California, Oregon, Idaho, and Washington from 1986 through 1995 when the project was terminated due to reductions in funding. The data are reported for use by investigators who may find them to be of value in mineral exploration. No attempt has be made in this report to summarize the voluminous literature on these ore deposits.