The origin, nature and tectonic significance of the Hallinmaki Cu-deposit, Virtasalmi District, south-central Finland

Lawrie, Kenneth Campbell (1987) The origin, nature and tectonic significance of the Hallinmaki Cu-deposit, Virtasalmi District, south-central Finland. PhD thesis, University of Glasgow.

Abstract

The Hallinmaki Cu-deposit is a polyphase deformed and metamorphosed orebody located within the Early Proterozoic Svecofennides of South-Central Finland. The lithological assemblage within which the orebody is situated dominantly comprises amphibolites, with minor marbles, calc-silicate skarn lithologies and gneisses, together with syn-kinematic intrusions dominantly of tonalitic composition. Fold and fabric elements of seven deformational phases have been recognised in the study area. The first deformational phase, (D1-D7), is expressed principally as a penetrative fabric axial planar to F1 folds. However, evidence for both these structural elements has been largely destroyed by subsequent overprinting during and D1. The major structural features recognised are folds developed during D2 and D1. The study area lies in the hinge zone of a large tight, reclined F1 fold with a NW-SE-trending axis and which closes to the SE. This structure refolds large tight-isoclinal plunging inclined asymmetrical F2 folds, to which a variably penetrative S2 fabric is axial planar. Post-D1 structures are expressed as more localised fold and fabric elements. Peak dynamothermal metamorphism representing recrystallisation under conditions of the upper amphibolite-granulite facies transition zone (750-800

• Item Type: Thesis (PhD)
• Qualification Level: Doctoral
• Keywords: Geology, petrology.
• Colleges/Schools: College of Science and Engineering
• Supervisor's Name: Bowes, Prof. D.R.
• Date of Award: 1987
• Depositing User: Enlighten Team
• Unique ID: glathesis:1987-73979
• Copyright: Copyright of this thesis is held by the author.
• Date Deposited: 14 Jun 2019 08:56
• Last Modified: 10 Jun 2021 14:32
• URI: https://theses.gla.ac.uk/id/eprint/73979