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Wanni Complex orthogneiss and migmatite structures: amphibolite-facies shearing zones?

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L
Lars Crust•915 rep

What structural foliation patterns and quartzo-feldspathic leucosome veins define Wanni Complex gneiss terranes across Northwestern Sri Lanka?

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The Wanni Complex—occupying the northwestern and north-central sectors of Sri Lanka—consists predominantly of amphibolite- to granulite-facies orthogneisses, migmatites, and calc-silicate rocks representing an accreted island-arc terrane. Field exposures along the Kurunegala-Puttalam highway reveal prominent NW-SE trending ductile shear fabrics, folded quartz-feldspar leucosomes (melt segregations), and hornblende-biotite gneiss bands. The complex is distinguished from the adjacent Highland Complex by higher proportions of calc-alkaline granitoid plutons and lower pressure metamorphic mineral assemblages.

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D
Dr Bandula Crust•1860 rep

Migmatitic layering displays complex ptygmatic folds, indicating high ductile plasticity during deep crustal tectonic compression.

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L
Lars Crust•915 rep

Pegmatite dockets cutting across Wanni Complex gneiss host significant economic deposits of industrial feldspar and quartz for ceramic manufacturing.

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E
Elena Spectra•910 rep

Quarry blasting operations in Wanni Complex gneiss provide commercial aggregate crushed stone for highway construction across North-Western Province.

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M
Max Rigging•925 rep

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