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S. A. Hussain ¹, J. Bhattacharjee ¹, S. Chakraborty ¹, D. Bhattacharjee ¹

Affiliations
1 Department of Physics, Tripura University, Suryamaninagar-799 022, Tripura, IN

Abstract

The present paper reports the incorporation of an anionic water soluble dye congo red (CR) in the cationic octadecylamine (ODA) Langmuir-Blodgett (LB) films. ATR-FTIR spectroscopy confirms the presence of CR molecules in the adsorbed LB films. The adsorption kinetics of the CR molecules onto ODA LB films have been demonstrated by UV-Vis absorption spectroscopy. Comparison of fitted curve of the reaction kinetics to that of the observed one reveals that the reaction kinetics between CR and ODA LB films is of first order kinetic process.

Keywords

Langmuir-Blodgett, Layer-By-Layer, ATR-FTIR, SEM, Reaction Kinetics.

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P. R. Golani ¹, R. C. Gathania ¹, A. K. Grover ¹, J. Bhattacharjee ¹

Affiliations
1 Geological Survey of India, Jhalana Dungri Complex, Jaipur 302 004, IN

Abstract

Felsic volcanics in the south Khetri Copper Belt (KCB) occur interlayered with fine grey banded phyllitic quartzite which often contains fine carbonaceous matter. The volcanics include crystal tuff, ultrafinely laminated grey tuff and pumice. They have been recognised in field on the basis of vesicles and rare amygdules; and under microscope by embayed and resorbed quartz phenocrysts. Glass is altered and incipiently recrystallised. Devitrification textures like spherulites are intact in rare cases. The relatively unaltered tuffs fall in dacitic field of Total Alkali-Silica (TAS) diagram. The tuffs are intimately associated with baryte and ironstone layers at places. Recent work in the south KCB indicates that sulfide mineralisation is polymetaHic. It is stratabound hosted by felsic volcanics and fine carbonaceous phyllite and quartzite. The mineralised zones show wall-rock alteration in the form of profuse silicification and sericitisation. These features when seen in conjunction with the occurrence of concordant baryte and ironstone layers, indicate that the sulfide mineralisation is volcanic-exhalative type.

Keywords

Felsic Volcanics, Khetri Copper Belt, Rajasthan, Economic Geology.

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Fareeduddin ¹, I. R. Kirmani ¹, B. L. Srivastava ¹, A. B. Reddy ¹, J. Bhattacharjee ¹

Affiliations
1 Geological Survey of India, Jhalana Dungari, Jaipur - 302 004, IN

Abstract

Lamprophyre dykes are reported from the southern part of the South Delhi Fold Belt (SDFB), near Pipela, about 3 km SE of Sarupganj in Sirohi district of Rajasthan. They occur as sub-volcanic intrusives in the Ajabgarh supracrustals and follow a WNW -ESE to E-W trends. They show porphyritic and panidiomorphic textures with biotite and magnetite occurring as euhedrru phenocrysts ina cryptocrystalline matrix. One large Jamprophyre body shows acompositionallayering. Widespread alteration (chloritisation of biotite and potash depletion) suggests that they are not cogenetic with the post-Cretaceous, fresh lamprophyres of the Mundwara area. Probably these dykes are emplaced during the waning stage of the Late Proterozoic tectonomagmatic cycle of the South Delhi Fold Belt.

Keywords

Lamprophyres, Delhi Fold Belt, Rajasthan.

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