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GEOREF RECORD

Rare earth element and gold exploration in glaciated terrain; example from the Makara area, northern Finland

Olli Sarapaa and Pertti Sarala
Rare earth element and gold exploration in glaciated terrain; example from the Makara area, northern Finland (in IAGS Finland 2011, Anonymous)
Geochemistry - Exploration, Environment, Analysis (May 2013) 13 (2): 131-143

Abstract

The Makara Au-rare earth element (REE) prospect area is located in the Tana Belt, south of the 1.9 Ga Lapland Granulite Belt, in northern Finland. The Belt has prominent lanthanum (La) and yttrium (Y) anomalies in regional till and bedrock geochemical data. High Y indicates enrichment of heavy REE in the bedrock. At Makara, promising narrow Au-hematite-quartz veins occur in connection with tensional fractures in the great shear zone. Under the latest ice divide of the last glaciation, subglacial erosion was weak and glacial transport distance short. High Au contents in saprolite and till together with deep weathering have a strong positive correlation with the positive electromagnetic anomalies caused by the sulphidic gneisses. The highest La and Y contents in till correlate well with the Th maxima of airborne-radiometric datasets. Locally, the <0.06 mm till size fraction contains up to 0.4% REE. A recent exploration project in Makara revealed a 13 m wide Au-hematite-quartz vein with a mean of 3 ppm Au and 0.04-0.1% REE in kaolinitic saprolite derived from arkosic gneiss. The elevated REE content resembles that of ionic adsorption clays in China. Typical REE-rich minerals are monazite, rhabdophane, xenotime and kaolinite. Till geochemistry proved useful in REE exploration.


ISSN: 1467-7873
EISSN: 2041-4943
Serial Title: Geochemistry - Exploration, Environment, Analysis
Serial Volume: 13
Serial Issue: 2
Title: Rare earth element and gold exploration in glaciated terrain; example from the Makara area, northern Finland
Title: IAGS Finland 2011
Author(s): Sarapaa, OlliSarala, Pertti
Author(s): Anonymous
Affiliation: Geological Survey of Finland, Rovaniemi, Finland
Pages: 131-143
Published: 201305
Text Language: English
Publisher: Geological Society Publishing House, London, United Kingdom
Meeting name: IAGS Finland 2011
Meeting location: FIN, Finland
Meeting date: 20112011
References: 31
Accession Number: 2013-055664
Categories: General geochemistryEconomic geology, geology of ore deposits
Document Type: Serial Conference document
Bibliographic Level: Analytic
Illustration Description: illus. incl. 3 tables, sketch maps
N65°15'00" - N70°04'60", E20°15'00" - E30°04'60"
Country of Publication: United Kingdom
Secondary Affiliation: GeoRef, Copyright 2019, American Geosciences Institute. Reference includes data from GeoScienceWorld, Alexandria, VA, United States. Reference includes data from The Geological Society, London, London, United Kingdom
Update Code: 201334
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