Characteristics of pegmatoidal granite exposed near Bayalan,Ajmer district,Rajasthan     

NILANJAN DASGUPTA  TARITWAN PAL  JOYDEEP SEN  TAMOGHNO GHOSH 《Journal of Earth System Science》2011,120(4):617-626

The study involves the characterization of pegmatoidal granite, southeast of Beawar, Ajmer district, Rajasthan. Earlier researchers had described this granite as part of the BGC, basement to the Bhim Group of the Delhi Super Group rocks. However, the present study indicates that it is younger than the rocks of Bhim Group of South Delhi Fold Belt, into which it is intrusive. The intrusion is structurally controlled and the outcrop pattern is phacolithic. The granite had intruded post-D₂ deformation of the Delhi orogeny along the axial planes of D₂ folds. The intrusion has also resulted in the formation of a contact aureole about the calc gneisses.  相似文献   

Thermochemical Data on Mineral Phases: The System CaO-MgO-Al2O3-SiO2     

SAXENA  SURENDRA K.; CHATTERJEE  NILANJAN 《Journal of Petrology》1986,27(4):827-842

Thermochemical data on several phases forming in the systemCaO-MgO-Al₂O₃-SiO₂ have been tested for consistency in reproducingexperimental phase equilibrium relationships. Calorimetric dataon enthalpy, entropy and heat capacity have been adjusted withinexperimental errors and new data on some phases have been estimatedusing phase equilibrium data. The consistency of the data inreproducing phase equilibrium relations in the multicomponent-multiphasesystems has been tested by computing phase diagrams using themethod of minimization of total Gibbs free energy. The recentcalorimetric data on most phases can be used without any significantchange except for phases that show cation disorder. Disordercorrections have been added to the heat capacity data on gehlenite,anorthite, spinel and Ca-Tschermak.  相似文献