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D. S. Bhattacharyya 《Mineralogy and Petrology》1966,11(1-2):65-71
Pebble elongation parallel to the fold axis is described and analysed in the light of rolling of viscoelastic bodies. It is concluded that a process of rolling coupled with compression in flexural slip folding is likely to explain the observed features qualitatively.With 5 Figures 相似文献
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Archana Bhattacharyya 《Geophysical Journal International》1998,132(1):181-190
A region of enhanced conductivity at the base of the mantle is modelled by an infinitesimally thin sheet of uniform effective conductance adjacent to the core–mantle boundary. Currents induced in this sheet by the temporally varying magnetic field produced by the geodynamo give rise to a discontinuity in the horizontal components of the poloidal magnetic field on crossing the sheet, while the radial component is continuous across the sheet. Treating the rest of the mantle as an insulator, the horizontal components of the poloidal magnetic field and their secular variation at the top of the core are determined from geomagnetic field, secular variation and secular acceleration models. It is seen that for an assumed effective conductance of the sheet of 108 S, which may be not unrealistic, the changes produced in the horizontal components of the poloidal field at the top of the core are usually ≤10 per cent, but corrections to the secular variation in these components at the top of the core are typically 40 per cent, which is greater than the differences that exist between different secular variation models for the same epoch. Given the assumption that all the conductivity of the mantle is concentrated into a thin shell, the present method is not restricted to a weakly conducting mantle. Results obtained are compared with perturbation solutions. 相似文献
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Gautam Mitra Kathakali Bhattacharyya Malay Mukul 《Journal of the Geological Society of India》2010,75(1):289-301
Thrust duplexes account for large fractions of the total shortening in most fold-thrust belts (FTBs). They also provide an
efficient mechanism for transferring slip upward from the basal decollement and for transporting roof thrust sheets over long
distances. The Lesser Himalayan duplex (LHD) plays a prominent role in the overall evolution of the Himalayan FTB and has
been described from Garhwal-Kumaon to Bhutan. In Sikkim the LHD shows unique structural geometry and has been responsible
for transporting crystalline thrust sheets (MCT 1 and MCT 2) farther southward than other parts of the Himalaya. Such lateral
variations in LHD geometry imply variations in the kinematic history of the Lesser Himalaya and variations in shortening and
shortening history along the length of the Himalayan arc, and these are reflected in observable large scale structural patterns. 相似文献
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Sandip K. Chakrabarti Abhijit Bhattacharyya 《Monthly notices of the Royal Astronomical Society》2001,326(2):L23-L26
A one-armed spiral bending wave in Saturn's rings excited by Titan's −1:0 inner vertical resonance is one of the most prominent oscillatory features observed by Voyager 1 . We study detailed dynamics of the particles inside the ring, and show that one of the main causes of the complete dissipation of the bending wave within a distance of ∼85 km from the resonance site could be as a result of the presence of a strong shear caused by radial velocity variation along the vertical direction. Assuming this to be the only source, Voyager data would suggest that if the surface density of matter is around 0.45 g cm−2 and the amplitude of the bending wave is around 1200 m, then the upper limit of total vertical thickness of the C ring near this resonance is around 40 m. 相似文献
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