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Data Series 595

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Geophysical, Geochemical, Mineralogical, and Environmental Data for Rock Samples Collected in a Mineralized Volcanic Environment, Upper Animas River Watershed, Colorado

By A.E. McCafferty, R.J. Horton, M.R. Stanton, R.R. McDougal, and D.L. Fey

Thumbnail of and link to report PDF (10 MB)Abstract

This report provides analyses of 90 rock samples collected in the upper Animas River watershed near Silverton, Colo., from 2001 to 2007. The samples are analyzed for geophysical, geochemical, mineralogical, and environmental rock properties of acid neutralizing capacity and net acid production. The database is derived from both published (n=68) and unpublished (n=32) data. New for all samples are geophysical measurements of electrical resistivity, density, and porosity. Rock samples were acquired from 12 geologic units that include key Tertiary volcanic and plutonic lithologies, all with varying degrees of alteration.

The purpose of this study is to
  • provide a comprehensive and complete record of U.S. Geological Survey rock samples collected and similarly analyzed in the upper Animas River watershed for various physical, chemical, and geoenvironmental properties;
  • provide measurements of geophysical rock properties of lithologic units to establish ground truth with respect to watershed-scale airborne magnetic and electrical survey data;
  • use the data to interpret the airborne geophysical anomalies to characterize rocks in terms of acid neutralizing capacity or net acid production; and
  • provide measurements to study the geochemical, mineralogical, and geophysical characteristics of rocks having weak to extreme degrees of alteration and to develop an understanding of how these characteristics change with alteration type.

Data are provided in two digital formats: an Arc/Info geodatabase and a Microsoft Excel spreadsheet.

First posted September 30, 2011

For additional information contact:

Center Director,
USGS Crustal Geophysics and Geochemistry Science Center
Box 25046, Mail Stop 964
Denver, CO 80225

Part of this report is presented in Portable Document Format (PDF); the latest version of Adobe Reader or similar software is required to view it. Download the latest version of Adobe Reader, free of charge.

Suggested citation:

McCafferty, A.E., Horton, R.J., Stanton, M.R., McDougal, R.R., and Fey, D.L., 2011, Geophysical, geochemical, mineralogical, and environmental data for rock samples collected in a mineralized volcanic environment, upper Animas River watershed, Colorado: U.S. Geological Survey Data Series 595, 13 p.


Contents

Abstract

Introduction

Lithologic Units

Data Summary

Physical Property Data

Geochemical Data

Mineralogical Data

Rock Environmental Property Data

Geodatabase Description

References Cited


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