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Publications (12)
Indian craton comprises a number of old rifts, e.g., the Narmada, the Mahanadi and the Godavari rifts, which reactivated in multiple stages during the supercontinent breakup events. The latest reactivation of the Indian rift system occurred at the Cretaceous-Tertiary boundary when the Réunion plume interacted with the Indian plate, leading to the m...
Intraplate seismic activity in stable cratons often shows little correlation with surface geological features. While major extensional structures, like aborted continental rifts, can serve as zones of weakness, geology-based models often fail to explain variations in seismic activity in continental regions away from active tectonic boundaries. In c...
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Mantle plumes, originated in deep Earth’s interior are thought to be a major source of enormous magma supply required for the formation of large igneous provinces (LIPs). This article focuses on the pulsating nature of Deccan volcanism in peninsular India, which is a remarkable LIP event at the end of the Cretaceous Period in...
Mantle plumes arising from deep sources in the Earth are thought to have played a critical role in determining the planetary geodynamics. The plumes originate mostly from gravitational or thermochemical instabilities at the core-mantle boundary, triggered by density fluctuations due to thermal or chemical variations. Understanding the initiation me...
It is a well-accepted hypothesis that deep-mantle primary plumes originate from a buoyant source layer at the core-mantle boundary (CMB), where Rayleigh–Taylor (RT) instabilities play a key role in the plume initiation process. Previous studies have characterized their growth rates mainly in terms of the density, viscosity and layer-thickness ratio...
In peninsular India, the Deccan Traps record massive, continental-scale volcanism in a sequence of magmatic events that mark the mass extinction at the Cretaceous-Paleogene boundary. Although the Deccan volcanism is linked with the Réunion hotspot, the origin of its periodic magmatic pulses is still debated. We develop a numerical model, replicatin...
It is a well-accepted hypothesis that deep-mantle primary plumes originate from a buoyant boundary layer at the Core-Mantle Boundary (CMB), where Rayleigh–Taylor (RT) instabilities play a key role in the plume initiation process. Combining 2D computational fluid dynamic (CFD) model simulations and a linear stability analysis, this article explores...
The Andean subduction system records a spectacular variation of the plume-driven arc volcano pattern in space and time. This article presents an experimental study of the volcano distributions in two specific regions: Puna and Payenia, where the volcanoes did not undergo later modifications due to any secondary structural processes, and they have p...
Dehydration melting in subduction zones often produces cold plumes, initiated by Rayleigh‐Taylor instabilities in the buoyant partially molten zones lying above the dipping subducting slabs. We use scaled laboratory experiments to demonstrate how the slab dip (α) can control the evolution of such plumes. For α > 0°, Rayleigh‐Taylor instabilities ev...
We show slab-parallel advection and Rayleigh-Taylor instability (RTI) as two competing gravity-driven flow mechanisms in the melt-rich layer atop a subducting slab. Scaled laboratory model results, supported by CFD simulations, indicate a transition of the RTI to advection mechanism at a threshold slab-dip angle (α) between 20° and 30°. The advecti...
Thermal convection in the mantle is the main driving process for the mechanism of plate movement and plume migration driven by the laws of heat flow and fluid mechanics. Earth's mantle can be divided into two parts depending upon their difference in physical and chemical properties, the lower mantle being denser (around 4.4 g/cm3) and hotter (3870...
Mid-ocean ridges (MORs) form in the lithosphere along the upwelling zones in the mantle where the lithospheric plates show divergent plate motion. MORs are intensely segmented by transform and transcurrent faults- represent the most common and spectacular surficial
expression of global tectonics. However, despite of an enormous development of mid-o...
