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Field-trip guide to the vents, dikes, stratigraphy, and structure of the Columbia River Basalt Group, eastern Oregon and southeastern Washington

Scientific Investigations Report 2017-5022-N

By:
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https://doi.org/10.3133/sir20175022N

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Abstract

The Columbia River Basalt Group covers an area of more than 210,000 km2 with an estimated volume of 210,000 km3. As the youngest continental flood-basalt province on Earth (16.7–5.5 Ma), it is well preserved, with a coherent and detailed stratigraphy exposed in the deep canyonlands of eastern Oregon and southeastern Washington. The Columbia River flood-basalt province is often cited as a model for the study of similar provinces worldwide.

This field-trip guide explores the main source region of the Columbia River Basalt Group and is written for trip participants attending the 2017 International Association of Volcanology and Chemistry of the Earth’s Interior (IAVCEI) Scientific Assembly in Portland, Oregon, USA. The first part of the guide provides an overview of the geologic features common in the Columbia River flood-basalt province and the stratigraphic terminology used in the Columbia River Basalt Group. The accompanying road log examines the stratigraphic evolution, eruption history, and structure of the province through a field examination of the lavas, dikes, and pyroclastic rocks of the Columbia River Basalt Group.

Suggested Citation

Camp, V.E., Reidel, S.P., Ross, M.E., Brown, R.J., and Self, S., 2017, Field-trip guide to the vents, dikes, stratigraphy, and structure of the Columbia River Basalt Group, eastern Oregon and southeastern Washington: U.S. Geological Survey Scientific Investigations Report 2017–5022–N, 88 p., https://doi.org/10.3133/sir20175022N.

ISSN: 2328-0328 (online)

Study Area

Table of Contents

  • Preface
  • Contributing Authors
  • Introduction
  • Physiography and Regional Setting
  • Stratigraphy of the Columbia River Basalt Group
  • Feeder Dikes
  • Physical Volcanology
  • Deformation and Crustal Stress During and After the CRBG Eruptions
  • Petrogenesis
  • Road Log
  • References Cited

Additional publication details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Field-trip guide to the vents, dikes, stratigraphy, and structure of the Columbia River Basalt Group, eastern Oregon and southeastern Washington
Series title:
Scientific Investigations Report
Series number:
2017-5022
Chapter:
N
DOI:
10.3133/sir20175022N
Year Published:
2017
Language:
English
Publisher:
U.S. Geological Survey
Publisher location:
Reston, VA
Contributing office(s):
Volcano Science Center
Description:
Report: x, 88 p.
First page:
1
Last page:
88
Country:
United States
State:
Oregon, Washington
Online Only (Y/N):
Y