Periodicity in the Deccan volcanism modulated by plume perturbations at the mid-mantle transition zone

This is a Preprint and has not been peer reviewed. This is version 2 of this Preprint.

Add a Comment

You must log in to post a comment.


There are no comments or no comments have been made public for this article.


Download Preprint


Dip Ghosh, Joyjeet Sen, Nibir Mandal


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, replicating the geodynamic scenario of the African superplume underneath a moving Indian plate, to explore the mechanism of magmatic pulse generation during the Deccan volcanism. Our model finds a connection between the Réunion hotspot and the African large low shear-wave velocity province (LLSVP) to show pulse generation from a thermochemical plume in the lower mantle. The plume is perturbed at 660 km, and its head eventually detaches from the tail under the influence of Indian plate movement to produce four major pulses (periodicity: 5 - 8 Ma), each giving rise to multiple secondary magmatic pulses at a time interval of ~ 0.15-0.4 Ma.



Physical Sciences and Mathematics


Cretaceous-Paleogene extinction, numerical simulation, African LLSVP, Reunion hotspot, Mid-mantle transition, Deccan Traps


Published: 2023-01-20 16:09

Last Updated: 2023-10-02 17:33

Older Versions

CC BY Attribution 4.0 International

Additional Metadata

Conflict of interest statement:
The authors declare that they have no known competing financial interest and personal relationship that could have appeared to influence the work presented here.

Data Availability (Reason not available):
The simulation code is freely available online under the terms of the GNU General Public License at files that reproduce the findings of this study are available from the authors upon reasonable request.