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Putting together pieces of a jigsaw puzzle; the nature and fit of the main tectonic domains using age and provenance studies of charnockites and metasediments from across the Southern Granulite; Terrane south India


, : Putting together pieces of a jigsaw puzzle; the nature and fit of the main tectonic domains using age and provenance studies of charnockites and metasediments from across the Southern Granulite; Terrane south India. Congres Geologique International, Resumes 34: 3183

Structurally placed at an orogenic triple junction, the Southern Granulite Terrane (SGT) of India plays an important role in unravelling the reconstruction of the amalgamation of the supercontinent Gondwana. The tectonic domains making up the SGT are subdivided based on the age, isotopic character and structure. From the north to south, these include the Salem Block, the Madurai Block and the Trivandrum Block. The main suture representing the closure of the Mozambique Ocean, is believed to be the Palghat-Cauvery shear system (PCSS), between the Salem and Madurai Blocks. The contact between the Madurai and Trivandrum Blocks (named the Achankovil Shear Zone) is believed to be of a structural nature. However, the true nature of the contacts between the above mentioned tectonic domains remain controversial. The most controversial and most debated of all is the isotopic boundary within the Madurai Block defined in the literature as the Karur-Kimbam-Painavu-Trichur (KKPT) shear zone. This boundary marks a transition between dominantly Archaean igneous province to the NW of the KKPT zone and largely Mesoproterozoic metasedimentary sequences to the SE. To better understand the nature of the contacts between the different tectonic domains, we present the U-Pb geochronology and Hf-isotopic analysis of zircons and provenance studies from a range of rock types including OPX-bearing gneisses (charnockites) and granulite-facies metasedimentary rocks from across the SGT. This study brings us one step closer to putting the pieces of a jigsaw puzzle together and understanding the role each tectonic domain played in the amalgamation of Gondwana.

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