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https://hdl.handle.net/2440/85017
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Type: | Journal article |
Title: | Crustal root of the Eastern Dharwar Craton: zircon U-Pb age and Lu-Hf isotopic evolution of the East Salem Block, southeast India |
Author: | Glorie, S. De Grave, J. Singh, T. Payne, J. Collins, A. |
Citation: | Precambrian Research, 2014; 249:229-246 |
Publisher: | Elsevier Science |
Issue Date: | 2014 |
ISSN: | 0301-9268 1872-7433 |
Statement of Responsibility: | S. Glorie, J. De Grave, T. Singh, J.L. Payne, A.S. Collins |
Abstract: | The Salem Block represents the northern part of the Southern Granulite Terrane in SE India, adjacent to the southern Dharwar Craton. New zircon U-Pb and Lu-Hf results on charnockites, granitoids and migmatites from the eastern Salem Block indicate that it mainly consists of bimodal juvenile Neoarchaean - early Palaeoproterozoic (~2.75-2.65. Ga and ~2.55-2.48. Ga) crust that underwent peak metamorphism at ~2.53. Ga. These U-Pb ages and Lu-Hf isotopic signatures characterize the Salem Block as part of the lower crust of the Eastern Dharwar Craton. The oldest (~2.75-2.65. Ga) granulites can be traced along important shear zones (Salem-Attur and Gangavalli Shear Zones), which may thus expose deeper levels of Eastern Dharwar lower crust, in a way similar to that proposed for the Nilgiri granulites. An additional (minor) contribution of recycled Western Dharwar Craton in the Salem Block is suggested by the presence of limited ~3.65-3.35. Ga recycled crust and ~2.9-2.6. Ga detritus. Younger intrusions within the Salem Block include the Cryogenian (~820-800. Ma) Yelagiri alkaline complex and the Ediacaran (559.1 ± 3.5. Ma) Sankari-Tiruchengode granitoid complex. These were sourced from recycled Neoarchaean protoliths of the Salem Block. Cryogenian-Tonian age magmatism is widespread within the Southern Granulite Terrane and is possibly related to initial subduction of the Mozambique Ocean. The Ediacaran A-type granitoids are thought to have formed during the Malagasy Orogeny that is related with the final consumption of the Mozambique Ocean and the collision of India with Azania-East Africa. © 2014 Elsevier B.V. |
Keywords: | Salem Block (southeast India); Dharwar Craton; Southern Granulite Terrane; Zircon U–Pb geochronology; Lu–Hf isotopic evolution |
Rights: | © 2014 Elsevier B.V. All rights reserved. |
DOI: | 10.1016/j.precamres.2014.05.017 |
Grant ID: | http://purl.org/au-research/grants/arc/FT120100340 |
Published version: | http://dx.doi.org/10.1016/j.precamres.2014.05.017 |
Appears in Collections: | Aurora harvest 2 Geology & Geophysics publications |
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