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DOI | 10.1130/B31474.1 |
Zircon U-Pb ages and Hf isotopic systematics of charnockite gneisses from the Ediacaran-Cambrian high-grade metamorphic terranes, southern India: Constraints on crust formation, recycling, and Gondwana correlations | |
Kumar, T. Vijaya1; Rao, Y. J. Bhaskar1; Plavsa, Diana2; Collins, Alan S.3; Tomson, J. K.4; Gopal, B. Vijaya1; Babu, E. V. S. S. K.1 | |
2017-05-01 | |
发表期刊 | GEOLOGICAL SOCIETY OF AMERICA BULLETIN
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ISSN | 0016-7606 |
EISSN | 1943-2674 |
出版年 | 2017 |
卷号 | 129 |
文章类型 | Article |
语种 | 英语 |
国家 | India; Australia |
英文摘要 | The Southern Granulite terrane, southern India, comprises a vast exposure of deep crust and forms a key region in the reconstruction of the Gondwana supercontinent. An E-W-trending crustal-scale shear zone, the Palghat-Cauvery suture zone system, which formed during the late Neoproterozoic-Cambrian (0.75-0.50 Ga), marks a prominent terrane boundary separating terranes with a predominantly late Neoarchean (ca. 2.5 Ga) regional granulite metamorphism to the north from those with an Ediacaran-Cambrian (0.63-0.50 Ga) regional granulite metamorphism to the south. Focusing on the younger granulite metamorphic domains, we present here new zircon U-Pb ages and Hf isotopic compositions for 11 charnockite orthogneisses from the Madurai, Trivandrum, and Nagercoil blocks and contribute to the resolution of the age of their magmatic protoliths. This study shows that the charnockite orthogneisses south of the Palghat-Cauvery suture zone relate to a minimum of four distinct episodes of felsic magmatism centered at: ca. 2.62-2.46 Ga, ca. 2.05-1.84 Ga, ca. 1.0-0.9 Ga, and ca. 0.80-0.76 Ga, pertaining to the Siderian, Orosirian, and Tonian Periods. Hafnium isotope analyses of zircon grains from the charnockite gneisses suggest that the proto-liths of the ca. 2.05-1.98 Ga gneisses from the Trivandrum and Nagercoil blocks and the ca. 1.0-0.9 Ga gneisses along the southeastern Madurai block involved a signif-icant juvenile magma component, while the protoliths of charnockite gneisses elsewhere in the Madurai block formed mainly through recycling of older crust up to ca. 3.2 Ga. A regional granulite-facies metamorphic imprint during the Ediacaran-Cambrian marked an advanced stage in the amalgamation of the Madurai, Trivandrum, and Nagercoil blocks into the East African orogen and its collision with the Dharwar craton. |
领域 | 地球科学 |
收录类别 | SCI-E |
WOS记录号 | WOS:000403309300008 |
WOS关键词 | TRACE-ELEMENT GEOCHEMISTRY ; HIGH-PRESSURE GRANULITES ; ACHANKOVIL SHEAR BELT ; EAST-AFRICAN OROGEN ; CONTINENTAL-CRUST ; DHARWAR CRATON ; MASS-SPECTROMETRY ; MADURAI BLOCK ; SALEM BLOCK ; TECTONIC EVOLUTION |
WOS类目 | Geosciences, Multidisciplinary |
WOS研究方向 | Geology |
引用统计 | |
文献类型 | 期刊论文 |
条目标识符 | http://119.78.100.173/C666/handle/2XK7JSWQ/24454 |
专题 | 地球科学 |
作者单位 | 1.Natl Geophys Res Inst, CSIR, LAM MC ICPMS Natl Facil, Hyderabad 500007, Andhra Pradesh, India; 2.Curtin Univ, WASM, Dept Appl Geol, Perth, WA 6102, Australia; 3.Univ Adelaide, Dept Earth Sci, Ctr Tecton Resources & Explorat TRaX, Adelaide, SA 5005, Australia; 4.Natl Ctr Earth Sci Studies, Thiruvananthapuram 695011, Kerala, India |
推荐引用方式 GB/T 7714 | Kumar, T. Vijaya,Rao, Y. J. Bhaskar,Plavsa, Diana,et al. Zircon U-Pb ages and Hf isotopic systematics of charnockite gneisses from the Ediacaran-Cambrian high-grade metamorphic terranes, southern India: Constraints on crust formation, recycling, and Gondwana correlations[J]. GEOLOGICAL SOCIETY OF AMERICA BULLETIN,2017,129. |
APA | Kumar, T. Vijaya.,Rao, Y. J. Bhaskar.,Plavsa, Diana.,Collins, Alan S..,Tomson, J. K..,...&Babu, E. V. S. S. K..(2017).Zircon U-Pb ages and Hf isotopic systematics of charnockite gneisses from the Ediacaran-Cambrian high-grade metamorphic terranes, southern India: Constraints on crust formation, recycling, and Gondwana correlations.GEOLOGICAL SOCIETY OF AMERICA BULLETIN,129. |
MLA | Kumar, T. Vijaya,et al."Zircon U-Pb ages and Hf isotopic systematics of charnockite gneisses from the Ediacaran-Cambrian high-grade metamorphic terranes, southern India: Constraints on crust formation, recycling, and Gondwana correlations".GEOLOGICAL SOCIETY OF AMERICA BULLETIN 129(2017). |
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