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• W2070465510 abstract "We report U-Pb electron microprobe ages for zircon and monazite from two granitic plutons from southern India, the Vattamalai granite within the Palghat-Cauvery Shear Zone system and the Pathanapuram granite within the Achankovil Shear Zone. A zircon grain from the Vattamalai granite has a core age of 693±132 Ma and is surrounded by a thick overgrowth with an age of 504±104 Ma. Monazites from the Vattamalai granite show a small range of ages between 500-520 Ma. PbO vs. ThO2* plots of the monazites define a precise isochron age of 517±6.7 Ma (MSWD = 0.25). The oldest zircons in the Pathanapuram pluton are in the range 961-1149 Ma, with younger overgrowths at ~540-560 Ma. Monazite cores from the granite lie in the range of 526-574 Ma, whereas rims and bright overgrowths range from 506-539 Ma. These monazites define two linear arrays in PbO vs. ThO2* plots with cores yielding an isochron age of 550±25 Ma (MSWD = 0.58) and the rims defining an age of 515±15 Ma (MSWD = 0.68). The age data from the granite plutons indicate multiple thermal imprints in southern India with the latest orogeny during the Late Neoproterozoic-Cambrian (Pan-African). The older zircon cores up to 1149 Ma from the Pathanapuram pluton suggest inherited components of late Mesoproterozoic age, caught up within the granite magma. However, the dominant 570-520 Ma ages obtained from both zircons and monazites closely compare with similar ages for magmatism and metamorphism from throughout the East African Orogen. Late Neoproterozoic-Cambrian felsic magmatism occurred along both the Palghat-Cauvery Shear System and the Achankovil Shear Zone, indicating that these shears were active at this time and may have served as pathways for the emplacement of magmas generated at depth. The magmatism represents part of the various collisional-extensional episodes that marked the final amalgamation of the Gondwana supercontinent." @default.
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• W2070465510 date "2005-01-01" @default.
• W2070465510 modified "2023-10-17" @default.
• W2070465510 title "Late Neoproterozoic-Cambrian Felsic Magmatism Along Transcrustal Shear Zones in Southern India: U-Pb Electron Microprobe Ages and Implications for the Amalgamation of the Gondwana Supercontinent" @default.
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• W2070465510 doi "https://doi.org/10.1016/s1342-937x(05)70260-4" @default.
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