Geothermobarometry in the Archean Kuhmo-Suomussalmi greenstone belt, eastern Finland

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Authors:Tuisku, P.
Author Affiliations:Primary:
Univ. Oulu, Dep. Geol., Oulu, Finland
Volume Title:Archaean geology of the Fennoscandian Shield; proceedings of a Finnish-Soviet symposium
Volume Authors:Marttila, E., editor
Source:Special Paper - Geological Survey of Finland, No.4, p.171-172; Archaean geology of the Fennoscandian Shield; a Finnish-Soviet symposium, Finland, July 28-Aug. 7, 1986, edited by E. Marttila. Publisher: Geological Survey of Finland, Espoo, Finland. ISSN: 0782-8535
Publication Date:1988
Note:In English
Summary:P and T conditions during the metamorphism of the Archaean Kuhmo-Suomussalmi greenstone belt were calculated. The sphalerite-pyrite-pyrrhotite equilibria (Hutchison & Scott 1981) from different deposits yield P estimates with a mean value of 6.3 kbar and a 1.3 kbar standard deviation and a distinct peak between 6 and 7 kbar on the distribution histogram. Metamorphic T were structurally controlled. The Fe-Mg exchange equilibria in the inner parts of the greenstone belt synclinorium and associated synclines may indicate T as low as 500°C, whilst the outer parts may have reached T < 660°C, which is the value of the granite solidus at the P inferred. [J.M.H.]
Subjects:Archean; Greenstone belts; Metamorphic belts; P-T conditions; Precambrian; Europe; Finland; Kuhmo Finland; Oulu Finland; Scandinavia; Western Europe; Eastern Finland; Kuhmo greenstone belt; Suomussalmi Finland
Coordinates:N632000 N662000 E0303000 E0251500
Abstract Numbers:89M/0959
Record ID:2004039317
Copyright Information:GeoRef, Copyright 2019 American Geosciences Institute. Reference includes data from Mineralogical Abstracts, United Kingdom, Twickenham, United Kingdom, Reference includes data from PASCAL, Institute de l'Information Scientifique et Technique
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