Cordierite-spinel granulite paragenesis in Highland Complex khondalites: pressure-temperature paths?
What mineral reaction rims and peak metamorphic P-T conditions characterize aluminum-rich khondalite gneisses exposed near Balangoda?
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4 Answers from travellers
Khondalites—metamorphosed Proterozoic pelitic sediments comprising quartz, garnet, sillimanite, graphite, and K-feldspar—preserve diagnostic reaction textures recording near-isothermal decompression within the Highland Complex. Corona structures of cordierite surrounding sillimanite and garnet indicate that rocks subjected to peak granulite facies pressures exceeding 8 kbar experienced rapid decompression down to 4-5 kbar at temperatures near 800°C during Gondwana collisional unroofing.
Green spinel (pleonaste) occurs as minute inclusions inside cordierite rims, shielding iron-magnesium ratios from retrograde chemical re-equilibration.
Fluid inclusion analysis in quartz lenses reveals high concentrations of dense CO2 fluids trapped at peak metamorphic conditions.
Geological hammer collection in declared archaeological reserves requires prior scientific sampling permits from the Geological Survey and Mines Bureau (GSMB).
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