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Geochemical Atlases

Geochemical atlases are maps or databases providing regional coverage for a given media type (soil, sediment, groundwater, rocks, etc) at a large scale. They often cover a whole country or a larger region. They may be designed for the needs of mineral exploration, agriculture, land planning or risk management, but in most cases, they may also be used for other purposes. They are most useful for interpreting geochemical anomalies as well as for identifying local pollution.

They may be available free of charge – as a public service – or for a moderate publication cost. The earlier ones are available in printed form, while more recent ones are available online, sometimes with GIS features.

Most known atlases are listed here. Industry initiatives may lead to regional geochemical atlases as well, but they are usually not made public.

The list below is by far not exhaustive, do not hesitate to inform us of your own finds to be shared. 

 

Table 1: Main atlases

Region

Media

Density

URL

Africa - Zimbabwe

 

 

 

Ultra-low density geochemical mapping in Zimbabwe - http://www.sciencedirect.com/science/journal/03756742/144/part/PC

 

Argentina

stream sediments

 

1:250,000 scale maps compiled from exploration projects. Two coverages: one Pb Zn Cu coverage with locally other elements; one multielement coverage including up to 48 elements by ICP/AES, ICP/MS and INAA.

 

http://www.segemar.gov.ar/index.php/geoquimica/nuestro-alcance

Australia 

National Geochemical Survey of Australia (NGSA)

Catchment outlet sediment

1315 sites for

6174000 km2

http://www.ga.gov.au/ngsa

http://geea.lyellcollection.org/content/16/1/3.full.pdf+html

Australia 

Yilgarn Craton regional survey

Shallow groundwater

2507 samples for 657000 km2

http://geea.lyellcollection.org/content/16/1/100.abstract

Brazil

Stream and overbank sediments, soil and water, pan concentrates, 

359 sampls for 625000 km2

http://www.cprm.gov.br/publique/cgi/cgilua.exe/sys/start.htm?UserActiveTemplate=cprm_layout&sid=13

- GEOBANK (database)

- Geochemical Maps Catalog

- International Geochemical Mapping Pilot Project - summary edition

- The geochemical Atlas of Rio das Velhas Basin (in Portuguese)

Canada 

surficial sediments, water, bedrock, vegetation

variable

http://geochem.nrcan.gc.ca

Canadian Database of Geochemical Surveys (CDoGS)

Canada - Newfoundland and Labrador

 

 

http://gis.geosurv.gov.nl.ca/

Includes lake-sediment geochemical coverage of the entire province and till-geochemical coverage of about half of the island of Newfoundland (with data still being added) as well as links to numerous focused surveys of rock, till, lake and stream geochemistry

Chile 

Stream sediments and top soil

1 sample per 20 km2

 http://geoportal.sernageomin.cl/geoportal/catalog/main/home.page

http://www.sernageomin.cl/presentaciones-geologia.php

(Click on: “Mapa geoquímico del Norte de Chile (Juan Pablo Lacassie, Sernageomin)“:

 A ppt with the current advances of the project, in Spanish).

Chile - Northern

 

 

http://www.sernageomin.cl/pdf/presentaciones-geo/Mapa-geoquimico-del-Norte-de-Chile.pdf

China

 

 

Information expected soon

Europe

FOREGS

Subsoil, Topsoil

Humus

Stream Water

Stream Sediment

Floodplain Sediment

1 sample per 160x160 km (850 samples on average)

http://www.gtk.fi/publ/foregsatlas/

 

Europe

soil

4,131 samples representing a density of 1 site per 1500 sq. km

GEMAS (Geochemical Mapping of Agricultural and Grazing Land Soils) Project

http://www.eurogeosurveys.org/projects/gemas/.

Jamaica 

stream sediments, soil

 

http://eshare.uwimona.edu.jm/xmlui/handle/1119/6

Japan

 

 

https://www.gsj.jp/Map/EN/geochemistry.html

Mexico 

soil

1,327 sites (1 site per 1600 sq. km.), 3,526 samples

Not yet online, under completion

Peru

 

 

http://data.gov.uk/dataset/northern-peru-regional-geochemical-exploration-survey

Saudi Arabia

stream-sediment, soil

ongoing

http://www.sgs.org.sa/English/MineralResources/Pages/GechemicalExploration.aspx

UK

Soil

5691 samples for km2

www.bgs.ac.uk/gbase/advsoilatlasEW.html

More information on GBase to be added soon

USA, Mexico

Soil

10000 sites for 22Mkm2

http://minerals.cr.usgs.gov/projects/geochemical_landscapes/

NASGLP Soil Geochemical Landscapes Project

USA 

Soil

4,857 sites (1 site per 1600 km2), 14,434 samples

http://minerals.cr.usgs.gov/projects/soil_geochemical_landscapes/index.html

Soil Geochemical Landscapes

Raw data:  http://pubs.usgs.gov/ds/801/; 

Geochemical and mineralogical maps:  http://pubs.usgs.gov/of/2014/1082/;

Interactive web site:  http://mrdata.usgs.gov/soilgeochemistry/#/summary.

 

Table 2: European atlases

Region

media

density

URL

Baltic Region 

Terrestrial mosses and the organic

soil layer

476 samples

http://arkisto.gtk.fi/sp/sp50.pdf

Barents

stream water

minerogenic stream sediment

humus

moss

plants

minerogenic soil

complete soil profiles

498 sampling sites for 658 000 km2

http://newprojects.gtk.fi/barents/

Europe

FOREGS

Subsoil, Topsoil

Humus

Stream Water

Stream Sediment

Floodplain Sediment

1 sample per 160x160 km (850 samples on average)

http://www.gtk.fi/publ/foregsatlas/

Europe

soil

4,131 samples representing a density of 1 site per 1500 sq. km

GEMAS (Geochemical Mapping of Agricultural and Grazing Land Soils) Project

http://www.eurogeosurveys.org/projects/gemas/.

Europe 

Geochemical Atlas of Northern Europe; humus, moss, soil, stream sediment, stream water

58 311 samples

http://www.gtk.fi/publ/negatlas/index.php

Finland

Geochemical Atlas of Finland, part 1 : The hydrogeochemical mapping of Finnish grounwater

c. 3600 samples from whole contry

http://tupa.gtk.fi/julkaisu/erikoisjulkaisu/ej_005.pdf

Finland

Geochemical Atlas of Finland, Part 2: Till

1057 samples, 1 sample per 300 km2

http://tupa.gtk.fi/julkaisu/erikoisjulkaisu/ej_008.pdf

Finland

Geochemical Atlas of Finland , part3 : Environmental geochemistry – stream waters and sediments

1166 samples, density c. 1 sample per 300 km2

http://tupa.gtk.fi/julkaisu/erikoisjulkaisu/ej_020.pdf

Finland

Regional Geochemical Mapping, till

82 062 samples, 1 sample per 4 km2

http://arkisto.gtk.fi/tr/tr_130.pdf

http://geomaps2.gtk.fi/activemap/

Finland, Russia

Geochemical atlas of the eastern Barents region ; organic soil, minerogenic soil, terrestrial moss, stream water and sediment, vegetation

1 sampling site per 100 km2

http://www.sciencedirect.com/science/journal/03756742/83/1-3

France

agricultural soil

73400 sites on 500000 km2

http://www.gissol.fr/programme/bdetm/bdetm.php (in French)

France

stream sediment, soil, heavy minerals

over 200000 samples, heterogeneous distribution

http://sigminesfrance.brgm.fr/telechargement/divers/geochimie_inventaire.pdf (in French)

Germany

soil

one sample per 380 km² 

http://www.bgr.bund.de/EN/Themen/Sammlungen-Grundlagen/GG_geol_Info/Projekte/geochemical_atlas_of_germany/geochemical_atlas_germany_en.html

Italy

topsoil, subsoil, stream water, stream and floodplain sediment

extract from FOREGS

http://geo.geoscienze.unipd.it/sites/default/files/182/estratto_atlante.pdf

A list of regional atlases is available here.

Northern Fennoscandia

till, stream sediments, stream organic matter, stream moss, heavy mineral fraction

7267 sampling sites

Nordkalott Project : Geochemical Atlas of Northern Fennoscandia, 1 :4,000 000 

http://www.gtk.fi ; Only printed version available (Bølviken, B. et al.1986.)

UK

Soil

5691 samples for km2

www.bgs.ac.uk/gbase/advsoilatlasEW.html

More information on GBase to be added soon

 

 

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