1,669 research outputs found
Stream sediment geochemical mapping of Sierra Leone : orientation survey and roadmap to commencement
No full textThis report on Stream Sediment Geochemical Mapping of Sierra Leone: orientation survey and roadmap to commencement, has been developed by technical experts from the British Geological Survey (BGS) and the Directorate of Geological Survey (DGS) at the National Minerals Agency (NMA). It is the outcome of an orientation survey undertaken by geologists of both BGS and DGS, specifically to guide and inform the planning of the proposed nationwide geochemical mapping of Sierra Leone. The primary objective of this report was to form the basis for the development of protocols and procedures for the three main stages of the proposed nationwide geochemical mapping campaign: sample collection, sample preparation and sample analysis
Specialty farming in Idaho: Is it for me?
No full textBulletin no. 743 Moscow, Idaho :University of Idaho, College of Agriculture, Cooperative Extension System, 1992-01-01. Author(s): Barney, D.L.; Finnerty, T.L. ; Laughlin, K.M
Long-term memory of subduction processes in the lithospheric mantle: evidence from the geochemistry of basic dykes in the Gardar Province of South Greenland
No full textThe rift-related magmas of the Proterozoic Gardar Igneous Province were emplaced across the contact between the South Greenland Archaean craton and the Palaeoproterozoic Ketilidian mobile belt. It has been suggested that the geochemistry of Gardar intrusive rocks in the two areas varies across the craton margin and that this reflects a lithospheric control. However, comparison of the geochemical and isotopic signatures of basic and ultrabasic dykes from across the area shows that there is no systematic variation related to the age of the country rock. All the Gardar basic rocks are inferred to have been derived from the mantle, with relatively little crustal contamination. We suggest that the lithospheric mantle beneath the Gardar Province was enriched by slab-derived fluids during the Ketilidian orogeny (c. 1800 Ma). Subsequent melting of this mantle source was promoted during Gardar rifting when volatile-rich, small-degree melts from the asthenosphere were introduced into the lithospheric mantle, forming enriched metasomites. Ultrabasic lamprophyre dykes in the Gardar Province represent melts derived largely from these metasomites, whereas basaltic magmas were formed by larger-scale melting of the lithospheric mantle, inheriting a subduction-related signature. There is no evidence that the Gardar magmas were derived from a highly enriched lithospheric keel that had existed since craton formation
Geological mapping of Sierra Leone : baseline assessment and next steps
No full textSierra Leone is a resource-rich country, with extensive known and potential mineral and petroleum
resources. However, knowledge about the geology of the country is limited, with very little modern
data in the public domain, and this hinders sustainable development of these resources for the
national good. The lack of data is now being addressed by the Extractive Industries Technical
Assistance Programme Phase 2 (EITAP 2) which is funded by the World Bank, and which aims
to deliver a national airborne geophysical survey and subsequent geological mapping of the
country (World Bank, 2017).
Alongside EITAP 2, the UK government is funding the British Geological Survey (BGS) to work
in partnership with relevant institutions in Sierra Leone, including the National Minerals Agency
(NMA), the Petroleum Directorate (PD) and Fourah Bay College (FBC), to build their capacity to
collect, manage and disseminate geological data. As part of that work, a field reconnaissance was
carried out across Sierra Leone in January 2018 to assess the state of current geological mapping,
visit mines and exploration projects, and to discuss how best to plan and carry out a mapping
programme. The field trip was led by three British Geological Survey (BGS) staff members
(Kathryn Goodenough, Jon Ford, and Darren Jones) together with 11 geologists from the NMA,
two geologists from the PD, and two staff members from the Geology Department at Fourah Bay
College. Pauline Scott and Avril Jamieson from the Department for International Development
(DFID) joined the first two days of the trip.
This report describes the conclusions arising from that field reconnaissance and associated
literature review, including a baseline assessment of the current geological mapping of Sierra
Leone, and suggestions for next steps. Some information is also derived from separate field visits
to the AMR Gold licence area in the Loko Hills (April 2017) and coastal outcrops in the Lungi
area (June 2017)
Author Correction:A cattle graph genome incorporating global breed diversity
No full textThe original version of this Article omitted from the author list the 12th and 13th authors Dennis Muhanguzi and Wilson Amanyire, who are from the ‘School of Biosecurity, Biotechnology and Laboratory Sciences (SBLS), College of Veterinary Medicine, Animal Resources and Biosecurity, Makerere University, P.O Box 7062, Kampala, Uganda’. Consequently, the final sentence of the Author Contributions incorrectly read ‘D.W., P.T., E.A.J.C., C.E., E.T.O., E.R.A., A. Tijjani, K.M., A.F., B.R.F., A.Q., U.C. and P.W. provided samples and expertise for the studies’. This has been replaced with ‘D.W., P.T., W.A., D.M., E.A.J.C., C.E., E.T.O., E.R.A., A. Tijjani, K.M., A.F., B.R.F., A.Q., U.C. and P.W. provided samples and expertise for the studies’. This has been corrected in both the PDF and HTML versions of the Article
The Caledonian minor intrusions of the Assynt region
No full textThis report provides a full description of new mapping, petrographical and geochemical studies
of the minor intrusions of the Assynt area of the Northwest Highlands. These intrusions were
studied in detail by Sabine (1953) but since then little has been published on them, although a
PhD study was carried out by Young (1989). The minor intrusions are divided into six main
groups, each of which is described in detail
Primary Rare Earth Resources in Europe: an Overview
No full textThe rare earth elements (REE) have been identified by the European Commission as among the
most critical raw materials, due a combination of their economic importance and supply risks.
The supply risk is not the result of
a shortage of REE resources in the Earth’s crust, but is related
to a concentration of production in China. A number of supply chain issues can be recognized,
including: economic challenges that currently make it very difficult to open a REE mine outside
China; complex ore mineralogy and textures, which mean that a specific beneficiation flowsheet
must be developed for each REE deposit; the limited number of facilities for REE extraction and
separation outside China; and potential environmental problems such as the common association
of the REE with U and Th
Potential deposits of the rare earth elements and associated critical metals in the circum-Mediterranean regions
No full textThe ‘critical metals’ are those metals for wh
ich demand is increasing, typically due to
their use in green and high-tech applicati
ons, and for which there are concerns about
supply risk. Several different methods have
been used to estimate criticality (e.g. EC,
2014; Graedel et al., 2015). Virtually all studi
es place the rare earth elements (REE)
among the most critical of all raw materi
als, due to the concentration of their
production in China. Other crit
ical metals that may be fo
und in association with the
REE include niobium (Nb)
and tantalum (Ta)
The geological assets of Broadford and Strath : statement of significance and identification of opportunities
No full textThis report has been prepared for the Broadford and Strath Landscape Partnership scheme, in order to identify the main geological assets of the Broadford and Strath area, pick out key sites, and suggest opportunities for interpretation
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