The Norite of Sierra Leone
Abstract
I. Introduction. The norite of Freetown (Sierra Leone) was briefly described by G. Gürich in 1887, and in 1918 Prof. S. J. Shand translated Gürich's work, adding a few notes. I had the opportunity of making a detailed examination of this norite, as part of an investigation into the mineral resources of Sierra Leone; and in the course of this work it was found that the norite exposed around Freetown was only one end of a huge noritic complex which made up the whole mountain-mass of the Colony. Moreover, during the examination several features of considerable interest were observed, including the assimilation of one phase of the norite by another, the well-developed banding in the norite, the segregation of the iron-ores, and the sequence of the minor intrusions. These features, together with an important series of intergrowths of the common minerals, will be described in the course of this paper. The investigation into the mineral resources of the Colony, with especial reference to the iron-ores, formed part of the work of the Geological Survey of Sierra Leone during the latter part of 1918 and during 1919. (2) Physiography of the Area. 2 The Colony is a mountainous peninsula adjacent to the undulating low ground which forms the southern part of the Protectorate. Its mountains rise steeply from a narrow coastal plain to a height of nearly 3000 feet; this plain is continuous with that of the mainland, and is due to a Pleistocene uplift of a little over 300 feet. It
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The drainage pattern of the central part of the Freetown Peninsula is strongly influenced by NE-SW orientated parallel mountain ridges and two main NW-SE orientated valleys, probably associated with major unloading joint systems and bedrock faults.
“The drainage pattern is strongly influenced by a series of NE-SW orientated parallel mountain ridges (Dixey 1922) and two main NW-SE orientated valleys, probably associated with major unloading joint systems, and bedrock faults respectively.”
From The 2017 Regent Landslide, Freetown Peninsula, Sierra Leone (2019) · cites this paper as Dixey 1922
Cites
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Dixey, F. (1925) · Quarterly Journal of the Geological Society · doi:10.1144/gsl.jgs.1925.081.01-04.11 · Cited by 24 · see citing works
Self-citationThe 2017 Regent Landslide, Freetown Peninsula, Sierra Leone
Redshaw, P., Boon, D., Campbell, G., Willis, M., Mattai, J., Free, M., Jordan, C., Kemp, S. J., Morley, A., & Thomas, M. (2019) · Quarterly Journal of Engineering Geology and Hydrogeology · doi:10.1144/qjegh2018-187 · Cited by 23 · see citing works
“Finally, the Bullom Group marine and estuarine sediments were deposited unconformably on to the coastal strip of Sierra Leone during the Cenozoic (Dixey 1922; Williams 1978; Morel 1979; MacFarlane et al. 1979, 1981; Umeji 1983; Chalokwu 2001).”
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The textures and genesis of metamorphic pyroxene in the Freetown Intrusion
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Self-citationThe origin and emplacement of the Freetown Intrusion, Sierra Leone
Bowles, J. F. W., Lyon, I. C., Stewart, J. L. C., Suárez, S., & Vaughan, D. J. (2024) · Journal of African Earth Sciences · doi:10.1016/j.jafrearsci.2023.105160
- Authors
- Dixey, F.
- Corresponding author
- Dixey, Frank
- Venue
- Quarterly Journal of the Geological Society of London
- Publisher
- Geological Society of London
- Published
- 1922-03
- Volume
- 78
- Issue
- 1-4
- Pages
- 299-347
- ISSN
- 0370-291X (ISSN-L)
- OpenAlex
- W2062398673
- Cited by
- 17
- References
- 3
- Citations by year
- 2023: 2 · 2019: 1
- FWCI
- 5.84
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Quarterly Journal of the Geological Society (publishedVersion)
- Topics
- Physical Sciences › Earth and Planetary Sciences › Geophysics › Geological and Geochemical Analysis
- Physical Sciences › Earth and Planetary Sciences › Geology › Geological Studies and Exploration
- Physical Sciences › Earth and Planetary Sciences › Geochemistry and Petrology › Geochemistry and Elemental Analysis
- Keywords
- norite, Sierra Leone, Freetown, mineral resources, iron ore, assimilation, banding, mineral intergrowths, Pleistocene uplift
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