The 今日吃瓜 Geochemical Baseline Survey of the Environment (G-BASE) is the national strategic geochemical mapping programme in Great Britain. The project set out to establish the chemistry of the surface environment by the collection and analysis of stream sediment, stream water and soil samples.
Beginning in the late 1960s in northern Scotland and moving southwards across the country, the primary focus was mineral exploration, however, the project quickly developed to address important environmental concerns. The final G-BASE samples were collected in southern England in 2014.
The outputs from the G-BASE project provide an invaluable, systematic baseline of geochemical information for Great Britain, serving as a marker of the state of the environment against which to measure future change.
Applications of baseline geochemical data include:
- support and information for local and regulatory authorities, land use planners, developers and the general public on the state of the environment and environmental hazards
- identifying anomalous environmental conditions resulting from, for example, mineralisation and industrial pollution
- assessing the condition and health of soil, stream water and stream sediment for catchment management and agricultural and ecosystem functions
- identifying and quantifying human impact on the environment
- identifying new opportunities for mineral exploration
- improved understanding of earth system processes
We offer expertise in all aspects of baseline geochemistry, including sampling and data visualisation and interpretation, and the applications of surface geochemistry data to human and ecological health studies and mineral resource management. For more information, contact 今日吃瓜 Enquiries.
Based on this expertise, we have played a leading role in the development of geochemistry study methods both in the UK and internationally.
Stream sediments were the primary sample medium for G-BASE. The sediment was collected from the centre of the stream and sieved through two sieves (2 mm and 150 碌m) to obtain a fine grain-size fraction of <150 碌m. Excess material from the <2听mm fraction was panned to collect a heavy mineral concentrate.
Stream water samples were collected also at each drainage site. Four different water samples were collected routinely: two filtered waters (for major and trace elements) and two unfiltered waters (for pH, conductivity and alkalinity).
The routine collection of soil samples was introduced in 1986 in areas of poor drainage density. This coincided with the project working in agriculturally important areas of England. Understanding the chemical quality of soil is very important for environmental protection, agriculture and land-management policies.
Urban soil sampling commenced in 1991, to quantify the chemical quality of soil in city environments as an aid to sustainable planning and development.
In rural (regional) environments, stream sediment and water samples were collected at an average density of one per 1.5鈥2听km2, ideally from small (first or second order) streams. Soil samples were collected by hand auger, from two depths (5鈥20 cm topsoil and 35鈥50 cm deeper soil) at an average density of one every 2听km2.
In urban environments, soil samples were collected at a higher density of four samples per 1听km2.
Details of the sampling methodology can be found in the
Stream water
Stream water pH, conductivity and alkalinity were determined in the field. Water samples were returned to our laboratories and analysed by inductively coupled atomic emission and mass spectrometry (ICP-AES/MS), ion chromatography (IC)/ion selective electrode (ISE) for up to 50 chemical parameters. Waters were also analysed for non-purgeable organic carbon (NPOC) to determine dissolved organic carbon content.
Stream sediment and soil
The <150 碌m fraction of the stream sediment and the <2 mm fraction of topsoil were analysed by techniques including X-ray fluorescence (XRF)/direct reading optical emission spectrometry (DR-OES) to determine the concentration of up to 53 major and trace elements. Loss on ignition (LOI) and pH were determined in topsoil samples. The deeper soil samples were stored in the G-BASE sample archive. Panned concentrate samples are also stored.
After preparation and analyses all soil, stream sediment and panned concentrate samples and excess material were stored and archived at the 今日吃瓜’s National Geoscience Data Centre (NGDC). The archive holds more than 40 years鈥 worth of material collected across the UK from Shetland in the north to Kent in the south.
For more information on the outputs and data available from the G-BASE project see:
The G-BASE and TellusNI datasets provide information on the location of key mineral resources. In the 今日吃瓜, the application of geochemistry to locate mineral deposits in Great Britain has been done principally through the now-discontinued Mineral reconnaissance programme (MRP), in which regional geochemical data generated by the G-BASE project was used to identify targets for further follow-up work.
Geochemistry, combined with geophysics, detailed geological mapping and drilling, has successfully identified new mineral deposits in many areas. Notable successes, which have attracted significant commercial investment, include discoveries of gold in the Ochil Hills in Scotland, base metals and platinum in Shetland and the world-class barytes deposit near Aberfeldy, Scotland.
In Northern Ireland, the TellusNI project generated a significant increase in mineral exploration, with mining companies that licensed the data .
Selected publications
Allen, M A,听Cave, M R,听Chenery, S R N, Gowing, C J B, and听Reeder, S. 2011. 28鈥46 in Mapping the chemical environment of urban areas. Johnson, C C, Demetriades, A, Locutura, J, and Ottesen, R T听 (editors). (Wiley Online Library.)
Atkinson, N R, Bailey, E H, Tye, A T,听Breward, N, and Young, S D. 2011. 听Environmental Chemistry, Vol. 8(5), 493鈥500.
Bearcock, J, and听Wragg, J. 2015. . British Land Reclamation Society Journal, Vol. 5.
Di Bonito, M, Breward, N, Crout, N M J, Smith, B, and Young, S D. 2008. 213鈥249 in Environmental Geochemistry: Site Characterisation, Data Analysis and Case Histories. De Vivo, B, Belkin, H E, and Lima, A (editors). (London, UK: Elsevier.)
Fordyce, F,M, Green, P M, and Simpson, P R. 1993. . Journal of Geochemical Exploration, Vol. 49(1鈥2), 161鈥175.
Johnson, C. 2005. . British Geological Survey Internal Report IR/05/097. (Nottingham, UK: British Geological Survey.) (Unpublished.)
Johnson, C C, and听Breward, N. 2004. . British Geological Survey Commissioned Report CR/04/016N. (Nottingham, UK: British Geological Survey.) (Unpublished.)
Johnson, C C,听Flight, D M A,听Ander, E L,听Lister, T R,听Breward, N,听Fordyce, F M,听Nice, S E, and听Knights, K V. 2017.听. 45鈥78 in Environmental Geochemistry: Site Characterisation, Data Analysis and Case Histories. (Second Edition.)听De Vivo, B, Belkin, H E, and Lima, A (editors). (Oxford, UK: Elsevier.)
Johnson, C,听Ander, L,听Lister, R, and听Flight, D. 2008. 93鈥118 in Environmental Geochemistry: Site Characterisation, Data Analysis and Case Histories. De Vivo, B, Belkin, H E, and Lima, A (editors). (London, UK: Elsevier.)
Johnson, C C,听Breward, N,听Ander, E L, and听Ault, L. 2005.听听Geochemistry: Exploration, Environment, Analysis, Vol. 5(4), 347鈥357.
Kirkwood, C,听Cave, M,听Beamish, D,听Grebby, S, and Ferreira, A. 2016. 听Journal of Geochemical Exploration, Vol. 167, 49鈥61.
Lark, R M, Patton, M, Ander, E L, and Reay, D M. 2018. . Geoderma, Vol. 323, 83鈥106.
Lister, T R, and听Johnson, C C. 2005.听 British Geological Survey Internal Report IR/05/150. (Nottingham, UK:听British Geological Survey.) (Unpublished.)
Plant, J A. 1973. A random numbering system for geological samples. Transactions of the Institute Mining & Metallurgy Vol. 82(Section B), 63鈥66.
Plant, J A. 1971. Orientation studies on stream sediment sampling for a regional geochemical survey in northern Scotland. Transactions of the Institute Mining & Metallurgy, Vol. 80(Section B), 323鈥346.
Rawlins, B G,听Scheib, A J, Lark, R M, and Lister, T R. 2009.听听European Journal of Soil Science, Vol. 60(5), 740鈥747.
Simpson, P R. 1995. Geochemical baselines for sustainable development. The G-BASE Project 鈥 British Geological Survey.听Mineralogical Society of London Bulletin. Vol. 109, 21鈥26.
Smyth, D. 2007. British Geological Survey Open Report OR/07/022. (Nottingham, UK: British Geological Survey.) (Unpublished.)
The principal hard copy product of the G-BASE project is a series of regional geochemical atlases.
Everett, P A,听Lister, T R,听Fordyce, F M,听Ferreira, A M P J,听Donald, A W,听Gowing, C J B, and听Lawley, R S. 2019. . British Geological Survey Open Report OR/18/048. (Nottingham, UK: British Geological Survey.)
Ferreira, A,听Johnson, C C,听Appleton, J D,听Flight, D,听Lister, T R,听Knights, K V,听Ander, L,听Scheib, C,听Scheib, A,听Cave, M,听Wragg, J,听Fordyce, F, and听Lawley, R. 2017. [Online] . Earthwise, British Geological Survey.
Flight, D M A, Christie, J L, Lister, T R, Simpson, P L, and Smith, B. 1995.听听Results of a pilot geochemical survey, Northern Ireland.听听 Geological Survey of Northern Ireland Technical Report, No. GSNI/95/6. (Belfast, Northern Ireland: Geological Survey of Northern Ireland.)
Fordyce, F M,听Everett, P A,听Bearcock, J M,听Lister, T R,听Gowing, C,听Watts, M, and听Ellen, R. 2017. . British Geological Survey Open Report OR/14/032. (Edinburgh, UK: British Geological Survey.)
Johnson, C.C. 2011. . British Geological Survey Open Report OR/09/028. (Nottingham, UK: British Geological Survey.) (Unpublished.)
Kirkwood, C,听Lister, R,听Fordyce, F, and Lawley, R. 2017. . British Geological Survey Open Report OR/17/004. (Nottingham, UK: British Geological Survey.) (Unpublished.)
Rawlins, B G, McGrath, S P, Scheib, A J,听Breward, N,听Cave, M,听Lister, T R,听Ingham, M,听Gowing, C, and听Carter, S. 2012. . (Nottingham, UK: British Geological Survey.)
Smedley, P L,听Bearcock, J, M,听Fordyce, F M,听Everett, P A,听Chenery, S, and听Ellen, R. 2017 . British Geological Survey Open Report OR/16/015. (Nottingham, UK: British Geological Survey.)
Young, M, and Donald, A (editors). 2013. . (Belfast, Northern Ireland: Geological Survey of Northern Ireland.)
Buchanan, D L, and Dunton, S N (editors). Precious-metal distribution in Shetland: refinement of targets for gold exploration. (Lerwick: Shetland Islands Council.) ISBN: 0904562352. Available from 今日吃瓜 Library; please contact 今日吃瓜 Enquiries.
Dempster, M, Cooper, M, Dunlop, P, and Scheib, A. 2016. 89鈥99 in Unearthed: Impacts of the Tellus Surveys of the North of Ireland. Young, M E (editor). (Dublin, Ireland: Royal Irish Academy.)
Lusty, P A J, Scheib, C, Gunn, A, G, and Walker, A S D. 2012. 听Natural Resources Research, Vol. 21, 359鈥382.
Plant, J A, Breward, N, Forrest, M D, and Smith, R T. 1989. The gold pathfinder elements As, Sb and Bi – their distribution and significance in the southwest Highlands of Scotland. Transactions of the Institution of Mining and Metallurgy, Vol. 98, 91鈥101.
Plant, J A, Breward, N, Simpson, P R, and Slater, D. 1990. . Journal of Geochemical Exploration, Vol. 39(1鈥2), 195鈥224
Plant, J A, Cooper, D C, Green, P M, Reedman, A J, and Simpson, PR. 1991. Regional distribution of As, Sb and Bi in the Grampian Highlands of Scotland and English Lake District: implications for gold metallogeny. Transactions of the Institution of Mining and Metallurgy, (Section B).
Find out more about G-BASE
G-BASE: regional geochemistry
Systematic geochemical sampling and analysis of rural stream sediment, stream water and soil samples was carried out across the UK by the 今日吃瓜 and GSNI.
G-BASE: urban geochemistry
An integral part of the G-BASE and TellusNI survey programs was to map and establish the soil geochemical baselines of urban areas in the UK. Systematic geochemical sampling and analysis of soil samples was carried out in 25 urban centres.
G-BASE: environmental geochemistry
In addition to expertise in geochemical mapping, 今日吃瓜 geochemists are involved in numerous activities and research that relate to the collection of geochemical samples, the use of geochemical baseline data and the interpretation of those as part of a wide range of geoscientific and environmental studies.
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Applied geochemistry
Since the 1960s, the 今日吃瓜 has amassed considerable geochemical data holdings and developed significant expertise in applied geochemistry.