Gravity Survey of the Randalia Magnetic Anomaly Fayette County, Iowa: Report of Investigations 11, 1975

(1976) Gravity Survey of the Randalia Magnetic Anomaly Fayette County, Iowa: Report of Investigations 11, 1975. University of Iowa

pdf
Preview
PDF
2014-10-27_19-10-31_ri-11.pdf

File Size:9MB

Abstract

Supplementary gravity data on an anomaly delineated from an aeromagnetic survey of northeastern Iowa is presented in this report. The gravity survey included 240 observation stations located at section corners from central to western Fayette County. Analysis of the simple Bouguer map, residual gravity maps, and gravity profiles suggests that the observed gravity anomalies probably derive primarily from large fault blocks within the Precambrian crystalline complex and related variations in the thickness of superjacent clastic deposits. Interpretations based on magnetic susceptibility indicate that rocks of the basement complex lie at a depth of 2,000 feet (610 m) to 2,700 feet (823 m) below the surface within the study area and vary laterally in composition from basic to acidic. Two areas that exhibit high gravity and magnetic values may warrant exploration for potential mineralization.

Item Type: Departmental Report
Keywords: Geology, Mines, Geological Survey, Iowa
Subjects: Natural resources and environment
Natural resources and environment > Earth sciences
Natural resources and environment > Energy resources > Coal
Natural resources and environment > Environmental assessments
ID Code: 25821
Deposited By: Margaret Barr
Deposited On: 05 Dec 2017 19:27
Last Modified: 05 Dec 2017 19:27
URI: http://publications.iowa.gov/id/eprint/25821