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Sapphirine and Corundum-bearing Granulites from Karur, Madurai Block, Southern India |
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| Authors: | Toshiaki Tsunogae M Santosh |
| Institution: | aInstitute of Geoscience, University of Tsukuba, Ibaraki 305-8571, Japan bDepartment of Natural Environmental Science, Kochi University, Kochi 780-8520, Japan |
| Abstract: | We report new occurrences of sapphirine- and corundum-bearing granulites intercalated within orthogneisses at Lachmanapatti and Malappatty in the northern part of Madurai Block. Sapphirine in these localities occurs either as needle-like intergrowth with cordierite and corundum in symplectites and medium- to fine-grained euhderal to subhedral crystals associated with cordierite and corundum (Lachmanapatti) or in association with plagioclase, corundum and gedrite (Malappatty). The sapphirine from Lachmanapatti is highly magnesian (XMg = 0.87-0.94) with higher Cr content (up to 0.9 pfu) as compared with those in other localities in the Madurai Block. The sapphirine-corundum association reported in this study has important bearing on the ultrahigh-temperature metamorphism and exhumation history of the northern Madurai Block as well as on the tectonic evolution of the continental deep crust in southern India. |
| Keywords: | Sapphirine corundum ultrahigh-temperature metamorphism Madurai Block southern India |
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