Precambrian structure and chronology in the Highland Series of Sri Lanka |
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| Authors: | AR Berger NR Jayasinghe |
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| Institution: | Department of Geology, Memorial University of Newfoundland, St. John''s, Nfld. Canada |
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| Abstract: | Field studies in the Kandy district and elsewhere in the Highland Series demonstrate that these granulite facies rocks have been repeatedly deformed. The major folds (D3) postdate one and possibly two phases of isoclinal folding (D1 and D2) during which the main L-S fabric was formed. The main metamorphic peak probably occurred during these early phases, around 2200 Ma ago. The D3 episode appears to have predated the formation of the Vijayan gneisses at 1200 Ma. Hornblende-bearing gneisses mainly restricted to synformal basins are regarded as the result of local partial melting and mobilization during D3. |
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