Dear Friends,

The 36th International Geological Congress will be held in Delhi (India) from 2nd-8th March 2020. Kindly take out time to go through the web page and find out the details of conference and sessions of your choice.  My self along with Prof. W. Ghosh (Bose Institute, Kolkata) is convening the session on oxygen minimum zone biogeochemistry. The session will cover both presents as well as ancient records of OMZ. Many of you may find the session worth attending. The session is  broad-based for wider participation from workers in the sedimentary and aquatic biogeochemistry (including microbiology) of past and present oxygen minimum zone. Till 15th September, there is no abstract submission fee. For details kindly visit the site


Aninda Mazumdar
CSIR-National Institute of Oceanography
Goa-403004, India
Theme: Ancient and Modern Coasts and Continental Margin

Session 5.6 Marine Oxygen Minimum Zones: from Sedimentary Rocks to Modern Oceanographic Record

Dr. Aninda Mazumdar [log in to unmask] (India), Dr. Wriddhiman Ghosh (India)

Perennial oxygen minimum zones (POMZs), as well as hypoxic coastal regions (transient OMZs) in the marine realms, are characterized by remarkable depletion in dissolved oxygen concentrations attributed to high biological productivity and respiration rate, coupled with poor O2 replenishment by oxygenated water masses. The POMZs occur within a water depth ranging from 200-1200 mbsl. Currently, POMZs are most widespread in the eastern Pacific, off the western coast of continents, and the northern Indian Ocean. Biogeochemical processes in the water columns and sediments of POMZs and TOMZs differ remarkably from those of the ambient oxic marine realms. Several reports on the expansion of OMZs and a consequential threat to marine life, especially fisheries, have augmented research interest in both water columns and paleo-records of OMZs. Global rock records are dotted with tell-tale signatures of remarkable oxygen-depletion phases within marine realms, right from the Proterozoic. Oxygen-depletions in the past have not only caused significant alterations in the global cycling of iron, carbon, sulfur, nitrogen and redox-sensitive elements but also impacted benthic biodiversity within and beyond the OMZs. In this way, through the geological past, marine OMZs have played a central role in the spatiotemporal delineation of benthic biogeochemistry across the global ocean. With an aim at augmenting holistic understanding of the pasts and presents of marine OMZs, this symposium invites abstracts on sedimentary biogeochemistry and paleo-records, as well as aquatic geochemistry and geobiology, of global OMZs.

====================== Dr. Aninda Mazumdar Gas Hydrate research Group Geological Oceanography National Institute of Oceanography DonaPaula Goa-403004 Ph: 0832-2450493 Mobile:09423320630 ======================