Geologic map of the Gbanka Quadrangle, Liberia

Force, Eric R.; Dunbar, John

doi:10.3133/ofr74306

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“…The United Nations Development Program (UNDP) was also involved in mineral exploration during part of this period. Geologic maps of Nimba County were published as the following 1:250,000-scale quadrangles: Sanokole (Force and Berge, 1977), Zwedru (Force and Beikman, 1977), Zorzor (Seitz, 1977), Gbanka (Force and Dunbar, 1977), Buchanan (Tysdal, 1977a(Tysdal, , 1978a, and Juazohn (Tysdal, 1977b(Tysdal, , 1978b. others (1971-1972) have described an aspect of the geology near Cocopa.…”

Section: Status Of Geologic Knowledgementioning

confidence: 99%

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Geology of Nimba County, Liberia

Force¹

1983

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Precambrian rocks grouped in two initially Precambrian stratigraphy and geologic history ---------------------------Older units and events of the Gbedin-Kahnple area---------------------Older units and events of the Mt. Nimba area-------------------------22 Younger units and events of the entire Sanokole-Mt. Nimba area----------22 Eburnean(?) and younger even~ of eastern Nimba County --------------- 23 Miner& resources --------------------------------------------------- 23 Iron ---------------------------------------------------------- 23 Kyanite ------------------------------------------------------- 24 Diamonds and graphite -------------------------------------------GEOLOGY OF NIMBA COUNTY, LIBERIAPrecambrian rocks of Nimba County can be divided into three tectonic terranes: (1) a Nimba block of Nimba Supergroup supracrustal rocks containing isoclinal folds; (2) a Gbedin-Kahnple block, in which a folded granitic gneiss basement is unconformably overlain by iron-formation and leucocratic gneiss; and (3) a terrane of diorite, supracrustal rocks, and mafic rocks. The first two terranes were juxtaposed in an unknown manner and together were redeformed, metamorphosed (locally to granulite facies), and intruded by mafic rocks. The third terrane was later thrust over the first two. The histories of folding in the terranes were independent before juxtaposition but have been the same thereafter; four fold sets are recognized.

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Section: Status Of Geologic Knowledgementioning

confidence: 99%

“…A conspicuous shear zone along the St. John River (Force and Dunbar, 1977) fades just at the western boundary of the county. The zone along the Cestos River contains flinty ultramylonite.…”

Section: Faultsmentioning

confidence: 99%

Geology of Nimba County, Liberia

Force¹

1983

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Geologic map of the Gbanka Quadrangle, Liberia

Cited by 1 publication

References 1 publication

Geology of Nimba County, Liberia

Geology of Nimba County, Liberia

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