Precambrian Geology of Finland
Precambrian Geology of Finland

Author: Martti Lehtinen

Publisher: Elsevier

Published: 2005-11-29

Total Pages: 751

ISBN-13: 0080457592

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Focusing on the Precambrian in the central part of the Fennoscandian Shield, the book combines the results from modern geological and geophysical research into a detailed petrologic, lithologic, and structural synthesis and interpretation of the Archean and Proterozoic of Finland. It will be of value to anyone interested in the evolution of the shield in particular and in Precambrian geology in general.

Orbicular Rocks in Finland
Orbicular Rocks in Finland

Author: Seppo I. Lahti

Publisher:

Published: 2005

Total Pages: 188

ISBN-13:

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The orbicular rocks of Finland are various plutonic rocks. In this publication 29 bedrock and 61 boulder occurrences are described. Solitary boulders and boulder fans of orbicular rock are evidently derived from at least 50 separate bedrock occurences. Most of the orbicular rocks are recorded from Proterozoic bedrock (age 1.50-1.90 Ga), with relatively few discoveries from the Archaean basement areas (age 2.50-3.20 Ga). In addition, orbicular carbonatite has been encounteered in the late Devonian Sokli carbonatite intrusion (age 365 Ma).