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Tectonic map of Liberia based on geophysical and geological surveys

Open-File Report 72-32

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and

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Abstract

Interpretation of the results of aeromagnetic, total-gamma radioactivity, and gravity surveys combined with geologic data for Western Liberia from White and Leo (1969) and other geologic information allows the construction of a tectonic map of Liberia. The map approximately delineates the boundaries between the Liberian (ca. 2700 m.y.) province in the northwestern two-thirds of the country, the Eburnean (ca. 2000 m.y.) province in the south-eastern one-third, and the Pan-African (ca. 550 m.y.) province in the coastal area of the northwestern two-thirds of the country. Rock follation and tectonic structural features trend northeastward in the Liberian province, east-northeastward to north-northeastward in the Eburnean province, and northwestward in the Pan-African age province. Linear residual magnetic anomailes 20-80 km wide and 200-600 gammas in amplitude and following the northeast structural trend typical of the Liberian age province cross the entire country and extend into Sierra Leone and Ivory Coast.

Additional Publication Details

Publication type:
Report
Publication Subtype:
USGS Numbered Series
Title:
Tectonic map of Liberia based on geophysical and geological surveys
Series title:
Open-File Report
Series number:
72-32
Edition:
-
Year Published:
1972
Language:
ENGLISH
Publisher:
U.S. Geological Survey,
Description:
iii, 78 p. :ill., maps ;27 cm.