### Noble gas isotopes in mineral springs and wells within the Cascadia forearc, Washington, Oregon, and California

By: Patricia A. McCrory**James E. Constantz**Andrew G. Hunt**

                            https://doi.org/10.3133/ofr20161203

#### Links

-                                                                                                                             Document:                                                                                                                                                                                                                                                  **Report**                                                                                                     (15.0 MB pdf)                                                                                                                                     
- Companion File:  **Noble Gas Data**                            (14 KB xlsx)                        
- Download citation as:  RIS                         |                         Dublin                            Core

#### Introduction

First posted January 31, 2017

**For additional information, contact:**
Contact Information, Menlo Park, Calif. Office—Earthquake Science Center U.S. Geological Survey 345 Middlefield Road, MS 977 Menlo Park, CA 94025http://earthquake.usgs.gov/

This U.S. Geological Survey report presents laboratory analyses along with field notes for an exploratory study to document the relative abundance of noble gases in mineral springs and water wells within the Cascadia forearc of Washington, Oregon, and California (fig. 1). This report describes 14 samples collected in 2014 and 2015 and complements a previous report that describes 9 samples collected in 2012 and 2013 (McCrory and others, 2014b). Estimates of the depth to the underlying Juan de Fuca oceanic plate beneath sample sites are derived from the McCrory and others (2012) slab model. Some of the springs have been previously sampled for chemical analyses (Mariner and others, 2006), but none of the springs or wells currently has publicly available noble gas data. The helium and neon isotope values and ratios presented below are used to determine the sources and mixing history of these mineral and well waters (for example, McCrory and others, 2016).

#### Suggested Citation

McCrory, P.A., Constantz, J.E., and Hunt, A.G., 2017, Noble gas isotopes in mineral springs and wells within the Cascadia forearc, Washington, Oregon, and California: U.S. Geological Survey Open-File Report 2016–1203, 58 p., https://doi.org/10.3133/ofr20161203.

ISSN: 2331-1258 (online)

#### Study Area

#### Table of Contents

- Introduction 
- Methods 
- Mineral Spring and Well Sites Sampled for Noble Gas Isotopes 
- References Cited 
- Appendix 1 

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