naa a22 4500 510756476 CHVBK 20180411083124.0 cr unu---uuuuu 180411e20131001xx s 000 0 eng 10.1007/s12594-013-0159-7 doi (NATIONALLICENCE)springer-10.1007/s12594-013-0159-7 Petrology of the Udayagiri anorthosite complex, Eastern Ghats Belt, India [Elektronische Daten] [S. Mahapatro, A. Tripathy, J. Nanda, S. Rath] The Eastern Ghats Belt (EGB), characterised by pervasive Grenvillian granulite facies metamorphism, is the host to several 950-1000 Ma old massif-type anorthosite complexes. The present work describes one such complex near Udayagiri from the northern margin of the EGB, reported for the first time as "Udayagiri anorthosite complex” (UAC). The ‘massif type' UAC comprises mainly of anorthosite, leuconorite-olivine leuconorite and norite in the decreasing order of areal extent. Mineralogically, these rocks dominantly consist of cumulates of moderately calcic plagioclase (∼An50-60), moderately magnesian intercumulus olivine (XMg: ∼0.6) and orthopyroxene (XMg: 0.47 to 0.70). Metamorphic garnet (Alm: ∼50 mol%) is also common in these rocks. Anorthosite and leuconorite of the UAC exhibit a moderate ‘+ve' Eu anomaly. Norite occurs locally as schlierens and is relatively rich in Fe, P, Rb, Sr, Th, Nb, Ta, Y and REE which could be a residual melt product. These rocks exhibit both relict magmatic mineralogy and textures with a metamorphic impress manifested by the development of multilayered corona involving olivine, orthopyroxene, garnet, phlogopite, ilmenite and plagioclase during cooling of the pluton. The corona development is a result of combination of significant magmatic and metamorphic reactions which have the potential to provide important clues for deciphering the magmatic and metamorphic evolution of such plutons in ambient granulite facies conditions. Geological Society of India, 2013 Anorthosite nationallicence Leuconorite nationallicence Corona nationallicence Eastern Ghats Belt nationallicence Udayagiri nationallicence Orissa nationallicence Mahapatro S. Training Institute, SR, Geological Survey of India, 500 068, Hyderabad, India aut Tripathy A. State Unit: Orissa, Geological Survey of India, 751 003, Bhubaneswar, India aut Nanda J. S-4/113, Niladri Vihar, Chandrasekharpur, Geological Survey of India, 751 021, Bhubaneswar, India aut Rath S. CHQ, Geological Survey of India, 700 016, Kolkata, India aut Journal of the Geological Society of India Springer India 82/4(2013-10-01), 319-329 0016-7622 82:4<319 2013 82 12594 https://doi.org/10.1007/s12594-013-0159-7 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s12594-013-0159-7 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Mahapatro S. Training Institute, SR, Geological Survey of India, 500 068, Hyderabad, India aut NATIONALLICENCE 700 1- Tripathy A. State Unit: Orissa, Geological Survey of India, 751 003, Bhubaneswar, India aut NATIONALLICENCE 700 1- Nanda J. S-4/113, Niladri Vihar, Chandrasekharpur, Geological Survey of India, 751 021, Bhubaneswar, India aut NATIONALLICENCE 700 1- Rath S. CHQ, Geological Survey of India, 700 016, Kolkata, India aut NATIONALLICENCE 773 0- Journal of the Geological Society of India Springer India 82/4(2013-10-01), 319-329 0016-7622 82:4<319 2013 82 12594 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer