Beach Monazites from Alleppey: A Window to the Trivandrum Block, Southern India
Authors
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Department of Geology & Geophysics, I.I.T., Kharagpur - 721 302
Kamal Lochan Pruseth -
Department of Geology & Geophysics, I.I.T., Kharagpur - 721 302
Debidarsani Sahoo
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Geological Survey of India, Bangalore – 560 078
Bijay Kumar
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Geological Survey of India, Raipur
Vivek Kumar
DOI:
https://doi.org/10.1007/s12594-017-0596-9Abstract
Detrital monazites can be used to reconstruct the tectonothermal history of their provenance. Dating of beach monazites from Alleppey by EPMA U-Th-Pbtotal technique using the centroid method demonstrates that the ages recorded by even a small number of 28 analyses from a single thin section grain mount can potentially reveal a considerable portion of the tectonothermal history of the Trivamdrum block. Three monazite populations were identified that yielded ages 605 ± 9, 575 ± 23 and 548 ± 11 Ma, which have their more or less exact counterparts reported from the Trivandrum Block. One monazite grain yielded random Paleoproterozoic ages ranging from 1756 Ma to 1345 Ma representing similar ages which earlier have been interpreted as due to differential Pb-loss from >2000 Ma monazites during the late Neoproterozoic-Cambrian metamorphism.
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