northwestern Liberia

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Journal Article
Journal: Economic Geology
Published: 01 June 2015
Economic Geology (2015) 110 (4): 851-856.
... Pendanus candelabrum, known locally as Pamaya , first recognized in 1978 in the artisanal diamond diggings as an exotic plant, is now also confirmed as being diagnostic of coarsely brecciated kimberlite pipe eluvium. Extensive coverage of northwestern Liberia by road, foot, and air shows that Pandanus...
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Journal Article
Journal: GSA Bulletin
Published: 01 March 1975
GSA Bulletin (1975) 86 (3): 399-411.
...G. BRENT DALRYMPLE; C. SHERMAN GROMMÉ; RICHARD W. WHITE Abstract Tholeiitic diabase dikes that trend northwest-southeast, parallel to the coastline, are common in northwestern Liberia. K-Ar whole-rock and mineral ages determined from dikes that intrude Precambrian crystalline rocks are discordant...
Journal Article
Journal: Geophysics
Published: 01 June 1971
Geophysics (1971) 36 (3): 590-604.
...John C. Behrendt; Cletus S. Wotorson Abstract A 140,000 km aeromagnetic and total-count gamma radiometric survey was made over Liberia in 1967-68 along north-south lines spaced 0.8 km over land and 4 km over the continental shelf. The data approximately delineate the boundary between the Liberian...
Journal Article
Journal: GSA Bulletin
Published: 01 November 2014
GSA Bulletin (2014) 126 (11-12): 1465-1480.
...F. Molina; J. Martí; G. Aguirre; E. Vega; L. Chavarría Abstract The Cañas Dulces caldera is home to the Rincón de la Vieja–Santa María active volcanic complex and forms part of the northwestern sector of the inner magmatic arc of Costa Rica, together with other calderas and the active volcanoes...
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Journal Article
Journal: Geosphere
Published: 26 May 2017
Geosphere (2017) 13 (4): 1254-1284.
...Jing Ye; Dominique Chardon; Delphine Rouby; François Guillocheau; Massimo Dall’asta; Jean-Noel Ferry; Olivier Broucke Abstract The geological evolution of northwestern Africa and its continental margins is investigated in the light of nine Meso-Cenozoic paleogeological maps, which integrate...
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Series: Geological Society, London, Special Publications
Published: 01 January 2003
DOI: 10.1144/GSL.SP.2003.210.01.13
EISBN: 9781862394582
... the location of the Jacuípe-Sergipe/Alagoas and Gabon-Rio Muni conjugate sedimentary basins along the northeastern Brazilian margin and the northwestern African margin, the main focus of the present discussion. The Aptian salt basin extends to the Santos-Namibe region in the south, and the equatorial segment...
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Journal Article
Published: 01 January 2013
Bulletin de la Société Géologique de France (2013) 184 (1-2): 5-20.
.... However, previously to the Pangea, blocks from the COB domain formed two sets of garlands located on the northwestern Gondwana margin. The northern one moved to the North until the Silurian to collide the NAC (Taconic tectonic event) meanwhile the southern one remains on the Gondwana margin. All together...
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Journal Article
Published: 01 November 2008
Geochemistry: Exploration, Environment, Analysis (2008) 8 (3-4): 313-322.
...) reported that it found several samples having >1 mg/kg Au in a prospect within Grand Gedeh County in eastern Liberia. Key et al . (2004) found distinctive geochemical signatures from the Central Africa Copperbelt in northwestern Zambia. Relatively high values for a range of elements including U, Th...
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Published: 01 January 2018
DOI: 10.1144/SP472.11
EISBN: 9781786204127
.... This paper provides the first description of a clear chemical provinciality of the Sardinha tholeiitic magmatism in the eastern Parnaíba Basin, similar to that described in the Paraná Basin. Low-TiO 2 suites, independent of age, occur on the northwestern side of the Senador Pompéu–Coccoci lineament, whereas...
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Journal Article
Journal: Economic Geology
Published: 01 August 2000
Economic Geology (2000) 95 (5): 1172.
... , C hris J. F ridrich , and M ark R. H udson . 39 p. 1999. Geological Survey of Canada, 601 Booth Street, Ottawa, Ontario, Canada K1A 0E8 Inf. Circ. 341. Exploration for Volcanogenic Massive Sulphide (VMS) Deposits in the Khoabendus Group, near Kamanjab, Northwestern Namibia: The Wrong...
Journal Article
Published: 01 October 1979
Journal of the Geological Society (1979) 136 (5): 605-618.
... in Liberia and Sierra Leone Bull. geol. Soc. Am 1971 82 3483 90 Jones E. J. W. Mgbatogu D. Jurassic sea-floor spreading in the eastern equatorial Atlantic Nature, London 1977 267 688 90 Junner N. R. Rep. geol. Surv. Sierra Leone for 1927–28 1929 17 Kennedy W. Q...
Journal Article
Journal: Economic Geology
Published: 01 January 2017
Economic Geology (2017) 112 (1): 123-143.
... throughout belts in the Ivory Coast, in the northwestern corner of Niger, and in southernmost Liberia. The geology of these belts is discussed in more detail below. There is no doubt that some gold in the Man-Leo Shield must have formed before ca. 2100 Ma. Paleoplacers in the Tarkwa sediments indicate...
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Series: Reviews in Economic Geology
Published: 01 January 2008
DOI: 10.5382/Rev.15.13
EISBN: 9781629490229
... Fon deposit, and the remainder of the Simandou Range, is progressing toward planned iron ore production in 2013. Mount Nimba, at which iron ore mining ceased in 1990 due to civil war, is located approximately 130 km southeast of Pic de Fon in northwestern Liberia (Fig. 2 ). F ig . 1. Geologic...
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Journal Article
Journal: Geophysics
Published: 20 April 2012
Geophysics (2012) 77 (3): J15-J22.
... structures and fluid migration paths. In Figure  7b we show a lineament (dashed white line) which correlates with the gravity expression of the Serra Pilheira Fault ( Barbosa et al, 2007 ). This fault limits the northwestern onshore portion of Almada basin. We have presented an enhancing aeromagnetic...
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Journal Article
Published: 01 January 2001
Rocky Mountain Geology (2001) 36 (1): 1-12.
... in Wyoming and Colorado. For example, Neoproterozoic mafic dikes are present in northwestern Wyoming ( Harlan et al., 1997 ); small alkalic complexes are exposed in south-central Colorado (in the Wet Mountains and Powderhorn area near Gunnison) with isotopic dates that range from about 570 to 511 Ma ( Olson...
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Journal Article
Published: 16 October 2018
Journal of the Geological Society (2018) 176 (1): 97-114.
..., are observed along the Guinea–Liberia and Ivory Coast Equatorial margin segments, whereas shorter wavelengths are observed north along the Senegalese and Congo segments related to the Central and South Atlantic margins, respectively. The long wavelengths observed across the Leo-Man shield ( Fig. 1a ) may...
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Journal Article
Published: 01 March 2018
Journal of Paleontology (2018) 92 (2): 130-145.
... Ocean. It was reported by Nicklès ( 1955 ) as fossil from Quaternary deposits of Port-Gentil, Gabon and as living specimens from Liberia, Ghana (then called Gold Coast) and Nigeria. Similarities with C . inermis Deshayes from the Pacific Ocean and to C . krawangensis Oostingh from the Neogene...
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Published: 01 December 2015
DOI: 10.5724/gcs.15.34.0856
EISBN: 978-1-944966-00-3
... (between Ceará and Rio Grande do Norte offshore basins) whereas the opposite conjugate Western Equatorial Africa Margin extends from Sierra Leone to Liberia and Ivory Coast to Nigeria. Vertical movements due to volcanic cooling coupled with thermal subsidence due to sedimentary loading constructed...
Journal Article
Published: 01 February 2002
Geochemistry: Exploration, Environment, Analysis (2002) 2 (1): 45-56.
... for some of the potential Pb sources found in the area. Iron ores utilized for steel production were imported mainly from Africa (Liberia, Mauritania), Canada, India, former USSR, North and South America ( Anonymous 1979 a ). Coal utilized in the coke ovens was imported from a variety of North American...
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Journal Article
Journal: Economic Geology
Published: 01 January 2017
Economic Geology (2017) 112 (1): 99-122.
... of an Archean nucleus (the Kenema-Man domain, Fig. 1 ), centered in Liberia, that is tectonically juxtaposed against Paleoproterozoic granitoid-greenstone Birimian assemblages to the north and east (ca. 2.2–2.0 Ga, Castaing et al., 2003 , and references therein; Baratoux et al., 2011 ; Fig. 1 ). Recent...
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