dc.creator | BHATTACHARYA, S. | |
dc.creator | Basei, Miguel Angelo Stipp | |
dc.date.accessioned | 2012-10-20T04:35:45Z | |
dc.date.accessioned | 2018-07-04T15:45:09Z | |
dc.date.available | 2012-10-20T04:35:45Z | |
dc.date.available | 2018-07-04T15:45:09Z | |
dc.date.created | 2012-10-20T04:35:45Z | |
dc.date.issued | 2010 | |
dc.identifier | JOURNAL OF EARTH SYSTEM SCIENCE, v.119, n.2, p.175-181, 2010 | |
dc.identifier | 0253-4126 | |
dc.identifier | http://producao.usp.br/handle/BDPI/30237 | |
dc.identifier | 10.1007/s12040-010-0010-0 | |
dc.identifier | http://dx.doi.org/10.1007/s12040-010-0010-0 | |
dc.identifier.uri | http://repositorioslatinoamericanos.uchile.cl/handle/2250/1626877 | |
dc.description.abstract | The relation between alkaline magmatism and tectonism has been a contentious issue, particularly for the Precambrian continental regions. Alkaline complexes at the southwestern margin of Eastern Ghats belt, India, have been interpreted as rift-valley magmatism. However, those complexes occurring in granulite ensemble in the interior segments of the Eastern Ghats belt could not possibly be related to the rift-system, assumed for the western margin of the Eastern Ghats belt. Koraput complex was emplaced in a pull-apart structure, dominated by magmatic fabrics and geochemically similar to a fractionated alkaline complex, compatible with an alkalibasalt series. Rairakhol complex, on the other hand, shows dominantly solid-state deformation fabrics and geochemically similar to a fractionated calc-alkaline suite. Isotopic data for the Koraput complex indicate ca. 917 Ma alkaline magmatism from a depleted mantle source and postcrystalline thermal overprint at ca. 745 Ma, also recorded from sheared metapelitic country rocks. The calc-alkaline magmatism of the Rairakhol complex occurred around 938 Ma, from an enriched mantle source, closely following Grenvillian granulite facies imprint in the charnockitic country rocks. | |
dc.language | eng | |
dc.publisher | INDIAN ACAD SCIENCES | |
dc.relation | Journal of Earth System Science | |
dc.rights | Copyright INDIAN ACAD SCIENCES | |
dc.rights | restrictedAccess | |
dc.subject | Alkaline magmatism | |
dc.subject | granulite ensemble | |
dc.subject | mantle sources | |
dc.subject | moving continent | |
dc.title | Contrasting magmatic signatures in the Rairakhol and Koraput alkaline complexes, Eastern Ghats belt, India | |
dc.type | Artículos de revistas | |