GD
Geodynamics

edited by Jyotirmoy Paul

Jyotirmoy is a postdoc at the University of Bayreuth. He previously worked on the longevity of cratons using time-dependent mantle convection models. He is presently working on effect of grain size dependent rheology in the lower mantle dynamics. Jyotirmoy is part of the GD blog team as an editor. He is also manages the GD Facebook page as part of the social media team. You can reach Jyotirmoy via twitter @GeophyJo.

Do lower mantle slabs contribute in generating the Indian Ocean geoid low?

and February 23, 2022
Do lower mantle slabs contribute in generating the Indian Ocean geoid low?
Sunset above the stormy Indian ocean | Courtesy: Anupam Samanta | https://sites.google.com/view/anupamsamanta

The Indian Ocean Geoid Low is an enigmatic phenomenon in geodynamics. Many brain-storming hypotheses have been proposed in the last few decades to explain this geoid low. One popular idea argues that the high density lower mantle slabs contribute to this geoid low. Recent discoveries have shown that low-density anomalies from the African LLSVP region could have a more substantial influence on crea ...[Read More]

Lithospheric failure at subduction zones

and December 1, 2021
Lithospheric failure at subduction zones

Observing the Earth’s changing surface is the only thing solid Earth scientists can do; we simply cannot drill deep enough into the Earth and look at the processes that occur at very high temperatures and pressures. We must combine surface measurements from various disciplines to infer that specific surface imprints are caused by specific processes at depth. The sinking of oceanic plates into the ...[Read More]

The Deccan Chronicle: Plume or no-Plume? Perspective from a Deccan dyke swarm

and October 27, 2021
The Deccan Chronicle: Plume or no-Plume? Perspective from a Deccan dyke swarm
Source: https://www.maxpixel.net/static/photo/1x/Mountain-Eruption-Smoke-Volcano-Landscape-Lava-4129533.jpg

Deccan volcanism is one of the landmark events in India’s geodynamical history. Yet, its origin is still under debate regarding its association with the Réunion plume.  In this week’s news and views, Ayanangshu Das, a PhD student at the Indian Institute of Science Education and Research (IISER), Bhopal, explains their recent study to understand the emplacement mechanism by observing the magm ...[Read More]

Curious case of convex upwards topography in accretionary wedges

and September 22, 2021
Curious case of convex upwards topography in accretionary wedges
Experimental lab @ University of Calcutta, Photo by Sreetama Roy

Accretionary prisms are wedge-shaped bodies of crustal rocks that are commonly known to have formed by accommodating the component of convergence along subduction margins. These prisms, primarily wedge shaped with lateral variations in topographic height from hinterland to foreland are commonly characterised by a gentle and uniform slope towards the frontal margin (for instance, the Himalayan fold ...[Read More]