Abstract
The Farsund Shear Zone: geochemical evidence for lithological diversity in the wall rock of the Rogaland Anorthosite Province, South Norway
Highlights
Diapiric rise of anorthosite through ductile migmatites is the dominant mechanism of emplacement of the large anorthosite massifs in the Rogaland anorthosite province (RAP) (Duchesne, 1984; Barnichon et al, 1999; Charlier et al, 2010)
This diapirism may have been facilitated by a shear zone as suggested by the occurrence of a crustal size geophysical discontinuity revealed by deep seismic data (Andersson et al, 1996), and synthesised in the crustal tongue model of Duchesne et al (1999)
Charnockitic layers or bodies were possibly derived by local anatexis, such as the Breimyrknutan granite, or derived from fractionation of a quartz monzonitic magma, contemporaneous with the RAP magmatism in the 933–916 Ma interval
Summary
Diapiric rise of anorthosite through ductile migmatites is the dominant mechanism of emplacement of the large anorthosite massifs in the Rogaland anorthosite province (RAP) (Duchesne, 1984; Barnichon et al, 1999; Charlier et al, 2010). A component of this shear zone has been recently defined on the eastern flank of the magmatic province and called the Farsund Shear Zone (FSZ) (Bolle et al, 2010) This shear zone coincides with a unit of banded gneiss, interlayered with thin units of granitic gneiss and augen gneiss (Falkum 1982, 1985; Marker et al, 2003). We show that various types of mafic and felsic rocks produced at 6°00'E
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