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Open-File Report 2011–1100

Aqueous Geochemical Data from the Analysis of Stream-Water Samples Collected in June and August 2008—Taylor Mountains 1:250,000- and Dillingham D4 1:63,360-Scale Quadrangles, Alaska

By Bronwen Wang, Victoria Owens, Elizabeth Bailey, and Greg Lee

Abstract

We report on the chemical analysis of water samples collected from the Taylor Mountains 1:250,000- and Dillingham D-4 1:63,360-scale quadrangles, Alaska. Reported parameters include pH, conductivity, water temperature, major cation and anion concentrations, and trace-element concentrations. We collected the samples as part of a multiyear U.S. Geological Survey project entitled “Geologic and Mineral Deposit Data for Alaskan Economic Development.” Data presented here are from samples collected in June and August 2008. Minimal interpretation accompanies this data release. This is the fourth release of aqueous geochemical data from this project; data from samples collected in 2004, 2005, and 2006 were published previously. The data in this report augment but do not duplicate or supersede the previous data releases. Site selection was based on a regional sampling strategy that focused on first- and second-order drainages. Water sample sites were selected on the basis of landscape parameters that included physiography, wetland extent, lithological changes, and a cursory field review of mineralogy from pan concentrates. Stream water in the study area is dominated by bicarbonate (HCO3-), although in a few samples more than 50 percent of the anionic charge can be attributed to sulfate (SO42-). The major-cation chemistry of these samples ranges from Ca2+-Mg2+ dominated to a mix of Ca2+-Mg2+-Na++K2+. In most cases, analysis of duplicate samples showed good agreement for the major cation and major anions with the exception of the duplicate samples at site 08TA565. At site 08TA565, Ca, Mg, Cl, and CaCO3 exceeded 25 percent and the concentrations of trace elements As, Fe and Mn also exceeded 25 percent in this duplicate pair. Chloride concentration varied by more than 25 percent in 5 of the 11 duplicated samples. Trace-element concentrations in these samples generally were at or near the detection limit for the method used and, except for Co at site 08TA565, generally good agreement was determined between duplicate samples for elements with detectable concentrations. Major-ion concentrations were below detection limits in all field blanks, and the trace-element concentrations also were generally below detection limits; however, Co, Mn, Na, Zn, Cl, and Hg were detected in one or more field blank samples.

First posted September 21, 2011

For additional information contact:
Director, Alaska Science Center
U.S. Geological Survey
4210 University Dr.
Anchorage, Alaska 99508-4560
http://alaska.usgs.gov

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Suggested citation:

Wang, Bronwen, Owens, Victoria, Bailey, Elizabeth, and Lee, Greg, 2011, Aqueous geochemical data from the analysis of stream-water samples collected in June and August 2008—Taylor Mountains 1:250,000- and Dillingham D-4 1:63,360-scale quadrangles, Alaska: U.S. Geological Survey Open-File Report 2011–1100, 20 p.



Contents

Abstract

Introduction

Methods

Data Summary

References Cited

Appendix A. Analytical Data For Stream-Water Samples Collected in 2008 from the Taylor Mountains and Dillingham D-4 Quadrangles, Alaska.

Appendix B. Standard Reference Material (SRM) and Field Blank Data Accompanying Water Samples Collected in 2008 from the Taylor Mountains and Dillingham D-4 Quadrangles, Alaska


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