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Maps and interpretation of geochemical anomalies, Chuckwalla Mountains Wilderness Study Area, Riverside County, California

January 1, 1994

In March 1982, as part of the mineral resource investigations of the area, the U.S. Geological Survey conducted a reconnaissance geochemical survey of the Chuckwalla Mountains Wilderness Study Area (WSA), Riverside County, California. The survey involved collecting 196 heavy-mineral (panned) concentrates from stream sediment (the basis for these maps and the chief basis for the interpretations), the same number of sieved stream-sediment samples, and 25 samples of fresh, altered, or mineralized rocks. A broad regional geochemical framework for mineral resource evaluation was established by sampling a few miles beyond the boundaries of the WSA to include all of the Chuckwalla and Little Chuckwalla Mountains. These geochemical maps are therefore regional maps but of sufficient detail to allow valid conclusions about geochemical anomalies in the WSA.

The geochemical data were evaluated in three phases: (1) determining enrichment above background amounts for ore-forming and pathfinder (ore-associated) elements; (2) determining the dispersion patterns of the anomalous elements; and (3) relating the dispersion patterns to geologic environments favorable to ore deposition.

This report discusses and interprets geochemical results as they are seen at the reconnaissance stage. Analytical results for all samples collected are released in a U.S. Geological Survey Open-File Report (Adrian and others, 1985). A statistical summary of the data from heavy-mineral concentrates and sieved stream sediments is shown in table 1. The analytical results for selected elements in rock samples are shown in table 2.

Citation Information

Publication Year 1986
Title Maps and interpretation of geochemical anomalies, Chuckwalla Mountains Wilderness Study Area, Riverside County, California
DOI 10.3133/mf1795
Authors K. C. Watts
Publication Type Report
Publication Subtype USGS Numbered Series
Series Title Miscellaneous Field Studies Map
Series Number 1795
Index ID mf1795
Record Source USGS Publications Warehouse
USGS Organization