General geology and petrology of some Precambrian crystalline rocks from the Vijayan Complex of Sri Lanka |
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Authors: | Kapila Dahanayake HAH Jayasena |
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Institution: | Department of Geology, University of Peradeniya, Peradeniya Sri Lanka |
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Abstract: | Detailed field studies of the Precambrian Vijayan Complex terrain, Sri Lanka, reveal the occurrence of granites, gneisses and migmatites in association with calc-silicate gneisses, quartzites and dolerites. Microcline-rich granites and gneisses show both sharp and gradational contacts with the adjacent migmatites. Petrological observations favor a magmatic origin for the granites and gneisses. These bodies seem to have intruded into pre-existing metasedimentary rocks which were subsequently subjected to retrograde metamorphism under amphibolite facies conditions. |
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