Geological Survey Professional Paper 516—E A Geophysical Study in Grand Teton National Park and Vicinity, Teton County, Wyoming

Cover

Abstract

Introduction

Stratigraphy and structure—a summary, by J. D. Love

Downwarps
     Jackson Hole      Green River Basin
Mountains
     Teton Range
     Snake River and Hoback Ranges
     Gros Ventre Range
     Washakie Range
     Absaroka Range
     Yellowstone Volcanic Plateau
Anticlines
Thrust faults
Normal faults
Chronology of tectonic events and their relation to volcanism

Precambrian rocks, by John C. Reed, Jr

Layered gneiss
Granitic gneisses
Hornblende-plagioclase gneiss
Granodiorite and pegmatite
Diabase

Geophysical study

Field measurements
Gravity survey
Seismic-refraction survey      Profiles 1-3
          Sloping layer analysis
          Delay time analysis
          Gravity analysis along line 2 profile
     Profile 4
Warm Spring fault gravity analysis
Aeromagnetic survey

References cited

PLATE

1. Bouguer anomaly and generalized geologic map of Grand Teton National Park and vicinity. (omitted from the online edition)

2. Aeromagnetic map of Grand Teton National Park and vicinity. (omitted from the online edition)

3. Residual aeromagnetic map of Grand Teton National Park and vicinity. (omitted from the online edition)

FIGURE

1. Index map

2. Tectonic map of Teton County

3—6. Graphs showing seismic traveltime:
     3. Line 1
     4. Line 2
     5. Line 3

6. Sloping layer model fitted to traveltimes for seismic lines 1-3

7. Seismic delay-time model for seismic line 2

8. Seismic traveltime graph for seismic line 4

9. Model fitted to traveltime data of seismic line 4

10. Bouguer-anomaly curve and theoretical two-dimensional line integral gravity model for seismic line 4

11. Observed residual total magnetic intensity profile over Gros Ventre Range anomaly compared with theoretical points of model shown

TABLE

1. Summary description of sedimentary and volcanic rocks and of tectonic events in the general area of Jackson Hole

2. Average modes of principal rock types in the layered gneiss of the Teton Range

3. Average modes of granitic gneisses in the Teton Range

4. Average mode of granodiorite in the Teton Range

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Seismic refraction, gravity, and aeromagnetic studies provide new data on the structural geology of a famous area

UNITED STATES DEPARTMENT OF THE INTERIOR
STEWART L. UDALL, Secretary

GEOLOGICAL SURVEY
William T. Pecora, Director

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