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Cryogenian (~830 Ma) mafic magmatism and metamorphism in the northern Madurai Block, southern India: a magmatic link between Sri Lanka and Madagascar?

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dc.contributor.authorTeale, W.
dc.contributor.authorCollins, A.
dc.contributor.authorFoden, J.
dc.contributor.authorPayne, J.
dc.contributor.authorPlavsa, D.
dc.contributor.authorChetty, T.
dc.contributor.authorSantosh, M.
dc.contributor.authorFanning, C.
dc.date.issued2011
dc.description.abstractThe northern Madurai Block, southern India, lies directly south of, and partly deformed by, the Palghat-Cauvery Shear Zone System (PCSS) - a potential suture of the Neoproterozoic Mozambique Ocean. The Kadavur gabbro-anorthosite complex lies south of the PCSS, in the northern Madurai Block, and crystallized at 829±14Ma (LA-ICPMS zircon data) in a supra-subduction zone setting. The complex contains zircon εHf(t) values of -12.5 to -8.6 that represent Palaeoproterozoic T(DM) model ages (2.3-2.5Ga). These broadly agree with a whole rock neodymium T(DM) model age of 2287Ma. Oxygen isotope δ18O ratios range from 5.82‰ and 6.74‰. The parental magma for the gabbro-anorthosites are interpreted to be derived from a juvenile Neoproterozoic mantle contaminated by Mesoarchaean igneous infra-crustal sources. The gabbro-anorthosites intrude quartzites with dominantly Palaeoproterozoic detrital zircons that contain Neoarchaean and Mesoarchaean hafnium model ages. These quartzite zircons contain metamorphic rims that yield an age of 843±23Ma demonstrating the autochthonous nature of the gabbro-anorthosite complex. Later felsic magmatism is recorded by the 766±8Ma crystallisation age of the protolith of a felsic gneiss.Cryogenian magmatism in the Madurai Block is interpreted to form part of an extensive arc magmatic province within the southern East African Orogen that can be traced from central Madagascar, through southern India to the Wanni Complex of Sri Lanka. This province is interpreted to have formed above a south/west dipping subduction system as the Mozambique Ocean was subducted under the Neoproterozoic continent Azania.
dc.description.statementofresponsibilityWilliam Teale, Alan S. Collins, John Foden, Justin L. Payne, Diana Plavsa, T. R. K. Chetty, M. Santosh and Mark Fanning
dc.identifier.citationJournal of Asian Earth Sciences, 2011; 42(3):223-233
dc.identifier.doi10.1016/j.jseaes.2011.04.006
dc.identifier.issn1367-9120
dc.identifier.issn1878-5786
dc.identifier.orcidCollins, A. [0000-0002-3408-5474]
dc.identifier.orcidFoden, J. [0000-0003-3564-7253]
dc.identifier.orcidPlavsa, D. [0000-0002-6900-0872]
dc.identifier.orcidSantosh, M. [0000-0002-1073-8477]
dc.identifier.urihttp://hdl.handle.net/2440/68485
dc.language.isoen
dc.publisherPergamon-Elsevier Science Ltd
dc.rights© 2011 Elsevier Ltd. All rights reserved.
dc.source.urihttps://doi.org/10.1016/j.jseaes.2011.04.006
dc.subjectAzania
dc.subjectGondwana
dc.subjectHf
dc.subjectLA-ICPMS
dc.subjectMadurai Block
dc.subjectMozambique Ocean
dc.subjectSouthern India
dc.subjectZircon geochronology
dc.titleCryogenian (~830 Ma) mafic magmatism and metamorphism in the northern Madurai Block, southern India: a magmatic link between Sri Lanka and Madagascar?
dc.typeJournal article
pubs.publication-statusPublished

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