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Singh, Vinod K.
- Paleoarchean Zircons from Quartzite of South Bundelkhand Supracrustal Complex:Origin and Implications for Crustal Evolution in Bundelkhand Craton, Central India
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Authors
Affiliations
1 Institute of Geology, Karelian Research Centre, RAS, Petrozavodsk, RU
2 Department of Geology, Bundelkhand University, Jhansi 284 128, IN
3 Geoscience Division, Physical Research Laboratory, Ahmedabad 380 009, IN
4 School of Earth and Space Sciences, Peking University, Beijing, CN
1 Institute of Geology, Karelian Research Centre, RAS, Petrozavodsk, RU
2 Department of Geology, Bundelkhand University, Jhansi 284 128, IN
3 Geoscience Division, Physical Research Laboratory, Ahmedabad 380 009, IN
4 School of Earth and Space Sciences, Peking University, Beijing, CN
Source
Current Science, Vol 112, No 04 (2017), Pagination: 794-801Abstract
The present study reports trace elemental data from 39 Paleoarchean (3.43 and 3.25 Ga) zircons separated from quartzite near Girar, which forms a part of the South Bundelkhand Supracrustal Complex in Central India. The zircons are prismatic, have well-developed oscillatory zoning and their Th/U ratio ranging from 0.27 to 8.62 is comparable to that of typical magmatic zircons. Crystallization temperature of 620-776°C using titanium-in-zircon thermometer, positive slope of zircon REE patterns, positive Ce anomalies along with mineral inclusions like quartz, muscovite, magnetite and monazite suggest a granitic source for these quartzites. Sm-Nd isotopic data (TDM age = 3.29 Ga) along with zircon trace elemental data indicate the presence of granitic continental crust in southern Bundelkhand Craton at least during the Paleoarchean (3.4 Ga).Keywords
Bundelkhand Craton, Girar Supracrustal Belt, Quartzites, Rare Earth Elements, Zircon Chemistry.- Designing of Index-Guiding Photonic Crystal Fibre by Finite Element Method Simulation
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Authors
Affiliations
1 Department of Applied Physics, Indian School of Mine, Dhanbad, Jharkhand 826004, IN
1 Department of Applied Physics, Indian School of Mine, Dhanbad, Jharkhand 826004, IN
Source
International Journal of Advanced Networking and Applications, Vol 2, No 3 (2010), Pagination: 666-670Abstract
Different structures of Index-guiding Photonic crystal fibre are designed. The attractive vectorial Finite Element Method simulation technique is used to analyse such PCFs by taking suitable fibre parameter i.e. air hole diameter (d), pitch (Λ) and air core diameter (d´). Few important properties such as variation of refractive index with wavelength and nice confinement modal field pattern were studied. Index-guided photonic crystal fibre having inner core of radius 0.2µm, pitch 2.4μm and identical air hole of diameter d=1.38μm is suggested for which leakage of signal is almost zero at wavelength 1.55μm.Keywords
Effective Refractive Index, Finite Element Method, Index-Guided PCF, Photonic Crystal Fibre.- Challenges in Indian Higher Education
Abstract Views :234 |
PDF Views:83
Authors
Affiliations
1 Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, IN
1 Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur 208 016, IN