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Title: A gravity study of the thermopolis anticline, southern Bighorn Basin, Wyoming

Abstract

Approximately three hundred gravity stations were measured in the area of the Thermopolis anticline along the southern margin of the Bighorn Basin, Wyoming. Three broad anomaly patterns dominate the isostatic residual gravity map: a 10 mgal negative anomaly associated with sedimentary fill in the Bighorn Basin, a 20 mgal positive anomaly associated with the uplift of Precambrian basement in the Owl Creek Mountains, and a 2-3 mgal positive anomaly associated with the Thermopolis anticline. The anticline anomaly dominates a complex anomaly pattern located between the Owl Creek uplift and Bighorn Basin. Three poorly controlled patterns characterize the Owl Creek Mountains positive anomaly: a positive anomaly (eastern part) centered 6 miles (10km) from Precambrian basement exposures suggests thin basement overlying thick Wind River Basin sediments in thrust contact, a positive anomaly (western part) associated with Precambrian exposures suggests the presence of thick basement, and a smaller positive anomaly (central part of the range) is uninterpretable due to lack of gravity control. Gravity models suggest basement involvement in parts of the Thermopolis anticline besides Rose Dome and Warm Springs where wells have penetrated basement; the basement surface parallels the orientation of overlying units. Several other anticlines or domes show positive gravity anomaliesmore » on the isostatic residual map (Red Spring, Corley, Grass Creek-Golden Eagle, Little Sand Draw, Lucerne, and Gebo); the authors modeled the latter two with basement uplifts. Positive gravity signatures at Thermopolis Hot Springs suggest chemical precipitation in addition to basement involvement and negative signatures suggest geothermally-induced leaching.« less

Authors:
;  [1]
  1. California State Univ., Long Beach (United States)
OSTI Identifier:
5676361
Report Number(s):
CONF-8905393-
Journal ID: ISSN 0027-254X; CODEN: MOGEA
Resource Type:
Conference
Journal Name:
Mountain Geologist; (United States)
Additional Journal Information:
Journal Volume: 28:2-3; Conference: 2. workshop on geological applications of remote sensing to the study of sedimentary basins, Rector, PA (United States), May 1989; Journal ID: ISSN 0027-254X
Country of Publication:
United States
Language:
English
Subject:
58 GEOSCIENCES; SEDIMENTARY BASINS; GEOLOGIC STRUCTURES; GRAVITY SURVEYS; WYOMING; ANTICLINES; BASEMENT ROCK; DATA ANALYSIS; GEOLOGIC MODELS; GROUND UPLIFT; HOT SPRINGS; MOUNTAINS; TWO-DIMENSIONAL CALCULATIONS; DEVELOPED COUNTRIES; FEDERAL REGION VIII; GEOPHYSICAL SURVEYS; NORTH AMERICA; SURVEYS; THERMAL SPRINGS; USA; WATER SPRINGS; 580000* - Geosciences

Citation Formats

Grannell, R B, and Showalter, P K. A gravity study of the thermopolis anticline, southern Bighorn Basin, Wyoming. United States: N. p., Web.
Grannell, R B, & Showalter, P K. A gravity study of the thermopolis anticline, southern Bighorn Basin, Wyoming. United States.
Grannell, R B, and Showalter, P K. . "A gravity study of the thermopolis anticline, southern Bighorn Basin, Wyoming". United States.
@article{osti_5676361,
title = {A gravity study of the thermopolis anticline, southern Bighorn Basin, Wyoming},
author = {Grannell, R B and Showalter, P K},
abstractNote = {Approximately three hundred gravity stations were measured in the area of the Thermopolis anticline along the southern margin of the Bighorn Basin, Wyoming. Three broad anomaly patterns dominate the isostatic residual gravity map: a 10 mgal negative anomaly associated with sedimentary fill in the Bighorn Basin, a 20 mgal positive anomaly associated with the uplift of Precambrian basement in the Owl Creek Mountains, and a 2-3 mgal positive anomaly associated with the Thermopolis anticline. The anticline anomaly dominates a complex anomaly pattern located between the Owl Creek uplift and Bighorn Basin. Three poorly controlled patterns characterize the Owl Creek Mountains positive anomaly: a positive anomaly (eastern part) centered 6 miles (10km) from Precambrian basement exposures suggests thin basement overlying thick Wind River Basin sediments in thrust contact, a positive anomaly (western part) associated with Precambrian exposures suggests the presence of thick basement, and a smaller positive anomaly (central part of the range) is uninterpretable due to lack of gravity control. Gravity models suggest basement involvement in parts of the Thermopolis anticline besides Rose Dome and Warm Springs where wells have penetrated basement; the basement surface parallels the orientation of overlying units. Several other anticlines or domes show positive gravity anomalies on the isostatic residual map (Red Spring, Corley, Grass Creek-Golden Eagle, Little Sand Draw, Lucerne, and Gebo); the authors modeled the latter two with basement uplifts. Positive gravity signatures at Thermopolis Hot Springs suggest chemical precipitation in addition to basement involvement and negative signatures suggest geothermally-induced leaching.},
doi = {},
url = {https://www.osti.gov/biblio/5676361}, journal = {Mountain Geologist; (United States)},
issn = {0027-254X},
number = ,
volume = 28:2-3,
place = {United States},
year = {},
month = {}
}

Conference:
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