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Tectonic significance of dykes in the Sarnu-Dandali alkaline complex,Rajasthan, northwestern Deccan Traps

Geoscience Frontiers 2016年第5期7卷 783-791页

作者： anjali vijayan Hetu Sheth Kamal Kant Sharma Department of Earth Sciences Indian Institute of Technology Bombay (IITB) Department of Geology Government Postgraduate College

Whether swarms of preferentially oriented dykes are controlled by regional stress fields, or passively exploit basement structural fabric, is a much debated question, with support for either scenario in individual case studies. The Sarnu-Dandali alkaline complex, near the northwestern limit of the Deccan Traps continental flood basalt province, contains mafic to felsic alkaline volcano-plutonic rocks and carbonatites. The complex is situated near the northern end of the 600 km long, NNWe SSE-trending Barmer-Cambay rift. Mafic enclave swarms in the syenites suggest synplutonic mafic dykes injected into a largely liquid felsic magma chamber. Later coherent dykes in the complex, of all compositions and sizes,dominantly strike NNWe SSE, parallel to the Barmer-Cambay rift. The rift formed during two distinct episodes of extension, NWe SE in the early Cretaceous and NEe SW in the late Cretaceous. Control of the southern Indian Dharwar structural fabric on the rift trend, as speculated previously, is untenable,whereas the regional Precambrian basement trends（Aravalli and Malani） run NEe SW and NNEe *** therefore suggest that the small-scale Sarnu-Dandali dykes and the much larger-scale BarmerCambay rift were not controlled by basement structure, but related to contemporaneous, late Cretaceous regional ENEe WSW extension, for which there is varied independent evidence.

关键词： Dyke swarms Alkaline magmatism Deccan Traps Sarnu-Dandali Barmer-Cambay rift

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Prediction of oil-water flow patterns, radial distribution of volume fraction, pressure and velocity during separated flows in horizontal pipe

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Journal of Hydrodynamics 2016年第4期28卷 658-668页

作者： Anand B.DESAMALA Vinayak vijayan anjali DASARI Ashok Kumar DASMAHAPATRA Tapas K.MANDAL Department of Chemical Engineering Indian Institute of Technology Guwahati

Flow of two immiscible fluids gives rise to variety of flow patterns,which influence transportation *** this work,we present detailed analysis on the prediction of flow pattern maps and radial distribution of volume fraction,pressure and velocity of a pair of immiscible liquids through a horizontal pipeline by computational fluid dynamics（CFD） simulation using ANSYS FLUENT *** viscous oil and water have been taken as the fluid pair for *** of fluid（VOF） method has been employed to predict various flow patterns by assuming unsteady flow,immiscible liquid pair,constant liquid properties,and co-axial *** the grid independent study,we have selected 47 037 number of quadrilateral mesh elements for the entire *** successfully predicts almost all the flow patterns（viz.,plug,slug,stratified wavy,stratified mixed and annular）,except dispersion of oil in water and dispersion of water in *** simulated results are validated with experimental results of oil volume fraction and flow pattern *** distribution of volume fraction,pressure and velocity profiles describe the nature of the stratified wavy,stratified mixed and annular flow *** profiles help to developing the phenomenological correlations of interfacial characteristics in two-phase flow.

关键词： stratified Prediction pipe annular unsteady radial validated turbulent turbulence separated

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