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Title: Geochemical analyses, age dates, and flow-volume estimates for quaternary volcanic rocks, Southern Cascade Mountains, Washington

Abstract

Data collected over the last three years as part of a continuing study of the Quaternary volcanic rocks of the southern Cascade Mountains are presented. Whole-rock chemical analyses, selected trace element geochemistry, volume approximations, specific gravity determinations, and locations are provided for most of the 103 samples collected, and 21 radiometric age dates are included. In addition, partial information, including names and flow-volumes, are presented for 98 additional samples, collected for related studies. The study extends from the Columbia River north to the Cowlitz River and Goat Rocks Wilderness area, and from the Klickitat River west to the Puget-Willamette Trough. The volcanic rocks are all younger than 3 million years and consist primarily of tholeiitic and high-alumina basalts and basaltic-andesites erupted from numerous shield volcanoes and cinder cones. A few analyses of more silicic rocks, including hornblende and/or pyroxene andesites and dacites characteristic of the stratovolcanoes of the region, are also presented. However, systematic sampling of the stratovolcanoes in the study area, Mount Adams and Mount St. Helens, was not conducted. A map of the areal extent of Quaternary volcanic units and sample locations is included. It has been based on the 1:125,000 reconnaissance geologic map of the southern Cascademore » Range by Hammond (1980).« less

Authors:
;
Publication Date:
Research Org.:
Portland State Univ., OR (USA). Dept. of Earth Sciences; Washington Div. of Geology and Earth Resources, Olympia (USA)
OSTI Identifier:
5191174
Report Number(s):
DOE/ET/27014-T7
ON: DE84007662
DOE Contract Number:
AC07-79ET27014
Resource Type:
Technical Report
Resource Relation:
Other Information: Portions are illegible in microfiche products
Country of Publication:
United States
Language:
English
Subject:
15 GEOTHERMAL ENERGY; 58 GEOSCIENCES; CASCADE MOUNTAINS; GEOCHEMICAL SURVEYS; DENSITY; GEOTHERMAL RESOURCES; RESOURCE ASSESSMENT; SAMPLING; VOLCANIC ROCKS; WASHINGTON; FEDERAL REGION X; IGNEOUS ROCKS; MOUNTAINS; NORTH AMERICA; PHYSICAL PROPERTIES; RESOURCES; ROCKS; SURVEYS; USA; Geothermal Legacy; 150302* - Geothermal Exploration & Exploration Technology- Geochemical Techniques & Surveys; 580400 - Geochemistry- (-1989)

Citation Formats

Hammond, P.E., and Korosec, M.A. Geochemical analyses, age dates, and flow-volume estimates for quaternary volcanic rocks, Southern Cascade Mountains, Washington. United States: N. p., 1983. Web. doi:10.2172/5191174.
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Hammond, P.E., & Korosec, M.A. Geochemical analyses, age dates, and flow-volume estimates for quaternary volcanic rocks, Southern Cascade Mountains, Washington. United States. doi:10.2172/5191174.
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Hammond, P.E., and Korosec, M.A. Thu . "Geochemical analyses, age dates, and flow-volume estimates for quaternary volcanic rocks, Southern Cascade Mountains, Washington". United States. doi:10.2172/5191174. https://www.osti.gov/servlets/purl/5191174.
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@article{osti_5191174,
title = {Geochemical analyses, age dates, and flow-volume estimates for quaternary volcanic rocks, Southern Cascade Mountains, Washington},
author = {Hammond, P.E. and Korosec, M.A.},
abstractNote = {Data collected over the last three years as part of a continuing study of the Quaternary volcanic rocks of the southern Cascade Mountains are presented. Whole-rock chemical analyses, selected trace element geochemistry, volume approximations, specific gravity determinations, and locations are provided for most of the 103 samples collected, and 21 radiometric age dates are included. In addition, partial information, including names and flow-volumes, are presented for 98 additional samples, collected for related studies. The study extends from the Columbia River north to the Cowlitz River and Goat Rocks Wilderness area, and from the Klickitat River west to the Puget-Willamette Trough. The volcanic rocks are all younger than 3 million years and consist primarily of tholeiitic and high-alumina basalts and basaltic-andesites erupted from numerous shield volcanoes and cinder cones. A few analyses of more silicic rocks, including hornblende and/or pyroxene andesites and dacites characteristic of the stratovolcanoes of the region, are also presented. However, systematic sampling of the stratovolcanoes in the study area, Mount Adams and Mount St. Helens, was not conducted. A map of the areal extent of Quaternary volcanic units and sample locations is included. It has been based on the 1:125,000 reconnaissance geologic map of the southern Cascade Range by Hammond (1980).},
doi = {10.2172/5191174},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Thu Dec 01 00:00:00 EST 1983},
month = {Thu Dec 01 00:00:00 EST 1983}
}
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Technical Report:
View Technical Report (1.63 MB)
DOI:  10.2172/5191174
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  • As part of the Washington geothermal exploration program, the Division of Geology and Earth Resources has been involved with studies of the state's major volcanoes and volcanic fields. The first major geothermal project by the Division involved geologic mapping and the drilling of 5 temperature gradient/heat flow holes in the Indian Heaven area in 1975. Funding was provided by the National Science Foundation. From 1980 to 1983, US Department of Energy contracts funded the geochemical analysis of over 100 samples from Indian Heaven and surrounding volcanic fields, and lead to the dating of several of the flows. Uncertainties about themore » existing age date determinations discouraged attempts to formulate a meaningful time-space-composition-volume model for the southern Cascade Range volcanic fields. With the promise of better age dating techniques and laboratories, the Division set out to improve the understanding of these rocks, with the hope of developing a new, more detailed and accurate model. This project was part of a larger program of temperature gradient and heat flow drilling in the southern Cascades Range. Funding for the age dates was provided through an existing US Department of Energy grant to the University of Arizona.« less

  • A continuation of gravity work in the Cascade Mountains of Washington is presented. Baseline gravity data were collected for use in geothermal resource evaluation. The purpose of this report is to describe a Fourier analysis method for separating residual and regional gravity anomalies from a complete Bouguer gravity anomaly field. The technique has been applied to gravity data from the Southern Cascade Mountains, Washington. Residual gravity anomaly maps at a scale of 1:250,000 are presented for various regional wavelength filters, and a power spectrum of the frequency components in the South Cascade gravity data is displayed. No attempt is mademore » to interpret the results of this study in terms of geologic structures.« less

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  • ;
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