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EGC-04 Geochemical mapping from the global to the local scale: The Arthur Darnley Symposium
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Northern Europe geochemistry (NEG) project - Map of ore related anomalous geochemical fields of fennoscandian shield and it's eastern frame at the scale of 1: 5 000 000
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Victor Chekushin, State Company Mineral (Russian Federation)
Lubov Selenok, State Company Mineral (Russian Federation)
Igor Bogatyrev, State Company Mineral (Russian Federation)
Sergey Glavatskikh, Stock-company Arkhangelskgeolrasvedka (Russian Federation)
Reijo Salminen, Geological Survey of Finland (Finland)
Kaj Lax, Geological Survey of Sweden (Sweden)
Clemens Reimann, Geological Survey of Norway (Norway)
Virgilia Gregorauskiene, Geological Survey of Lithuania (Lithuania)
Valter Petersell, Geological Survey of Estonia (Estonia)
Aivars Gilucis, GEOPLUS Ltd (Latvia)
Arkadiy Golovin, Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements, Moscow, Russian Federation (Russian Federation)
Lev Krinochkin, Institute of Mineralogy, Geochemistry and Crystal Chemistry of Rare Elements, Moscow, Russian Federation (Russian Federation)
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Keywords: regional mapping, geochemical maps, anomalous geochemical field, geochemical prospecting, mineral potential
Several international and national regional geochemical mapping projects have been carried out in Northern Europe during last few decades.
The NEG Project compiled existing regional geochemical data for an assessment of environmental status and mineral potential on territory of North-Western Russia, Finland, Sweden, Norway and Baltic countries. The assessment process included generalization of primary results from 28 national and international geochemical mapping projects, complex procedures of data standardization and preparation of summary maps for the whole area. Geochemical information from more than 62 000 samples from 8 different sampling media were used to prepare final geochemical maps.
Map of ore related anomalous geochemical fields (AGF) is based on standardized data from three sample media (fine fraction of C-horizon till, stream sediment and surface water). In accordance with the Russian methodology, the AGF map contains background information about geology and metallogeny of the region, data about patterns of geochemical anomalies, including category of their prospecting potential, and also structural position related to larger-scale taxonomic units (geochemical zones or metallogenic provinces). Catalogue of AGFs is an obligatory component of the AGF map and it includes detail characteristics (size, element composition in the sampled media, coefficients of element concentration and variability) of ore related geochemical anomalies. New districts recommended for prospecting are also noted.
All 134 defined AGFs were combined within 17 geochemical zones, forming systems of arc-shaped structures surrounding two large-scale mega-blocks of the Fennoscandian Shield (Kola and Svecofennian cratons). The total area of AGF is 688.5 km2 and 88 AGFs are classified as high or intermediate categories for perspective prospecting districts
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