Unravelling the complexities in high-grade rocks using multiple techniques : the Achankovil Zone of southern India
MetadataShow full item record
Funding and Sponsorship
The Achankovil Zone of southern India forms a distinct isotopic and structural boundary separating the Madurai Block to the north from the Trivandrum Block to the south. We combine isotopic and trace element geochemistry of major and accessory phases with phase equilibria modelling to provide quantitative constraints on the timing and conditions of peak metamorphism and the nature of the protoliths within the Achankovil Zone. The results suggest a clockwise pressure–temperature path with peak metamorphic temperatures of up to 950 °C at pressures of around 0.7 GPa followed by high temperature decompression. The metamorphic peak occurred at 545–512 Ma. U–Pb and Hf isotopic analysis of detrital zircon shows the rocks have a strong affinity with the southern part of the Madurai Block. The Achankovil Zone is interpreted as the reworked southern margin of the Madurai Block, which was metamorphosed during the final stages of the assembly of Gondwana.
Showing items related by title, author, creator and subject.
De Waele, Bert (2004)The Irumide belt is an elongate crustal province characterised by Mesoproterozoic tectonism and magmatism that stretches over a distance of approximately 900 kilometers from central Zambia to the Zambia-Tanzania border ...
Pourteau, Amaury; Candan, O.; Oberhnsli, R. (2010)The distribution of oceanic domains and continental blocks in Central Anatolia remains a challenge in understanding the Alpine geodynamic evolution of the Tethys realm. The consumption of a Neotethys oceanic branch at the ...
The evolution of a Gondwanan collisional orogen: A structural and geochronological appraisal from the Southern Granulite Terrane, South IndiaPlavsa, Diana; Collins, A.; Foden, J.; Clark, C. (2015)Gondwana amalgamated along a suite of Himalayan-scale collisional orogens, the roots of which lace the continents of Africa, South America, and Antarctica. The Southern Granulite Terrane of India is a generally well-exposed, ...