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Information on Symposia per Science Theme





Theme No.

Theme Title

Number of Symposia proposed

Symposia Title

Symposia Conveners

Biographical sketch of the Conveners

Keywords

Abstract

2

Hadean to Archean Earth


Prof. M. E. A. Mondal

erfan.mondal@gmail.com

(India)


Dr. C. Manikyamba

cmaningri@gmail.com

(India)


Prof. Jaana Halla jaana.halla@helsinki.fi

(Finland)

3

Hadean to Archean Earth: Geological, Geochemical, Geochronological, Geophysical, and Numerical Perspectives

Martin Whitehouse

martin.whitehouse@nrm.se

(Sweden)


Kristoffer Szilas

(Denmark)


1. Prof. Martin Whitehouse is an expert in the field of applications of radiogenic and stable isotopes to understand the earliest evolution of the Earth-Moon system and the origin and nature of early crusts of the Earth.


2.Dr. Kristoffer Szilas works on the petrology and geochemistry of Archaean rocks. His research aims at modelling in order to better constrain the early Earth Systems.

Hadean, Archaean, crustal evolution, geodynamics, early Earth systems

The comprehensive studies involving geological, geochemical, geochronological, geophysical, and numerical perspectives of the Hadean to Archean Earth will provide an opportunity to evaluate the conditions prevailed during the Hadean times, the processes involved in its transition into the Archean times, and evolution until the Archean-Proterozoic boundary.

Archaean Biosphere and Ecosystem

Mukund Sharma

mukund_sharma@bsip.res.in

(India)


Robert Riding

(USA)


1. Mukund Sharma is interested in understanding the evolution of early life on the Earth. His endeavors are targeted on Archaean and Proterozoic rocks to find evidence of early life early diversification prokaryotic metabolisms, radiation of eukaryotic forms and large complex megascopic remains


2. Robert E. Riding is an expert on microbial carbonates in earth history. His research investigates how algal and bacterial carbonates reflect long-term changes in major factors such as atmospheric composition, climate, sea-level, and seawater chemistry. He has worked on stromatolites and the development of ‘oxygen oases’ in Archean marine carbonates.

Stromatolites, Microbial Mats, MISS, Microfossils, Early Ecosystem

The Archaean Eon was an interval of fundamental interdependent changes in the evolution of the lithosphere, hydrosphere, atmosphere and life. Key biosphere developments include early physical evidence for life, both microfossils and macrofossils, and for significant biogeochemical interactions involving microbial metabolisms, redox changes, and marine and atmospheric oxygenation. Physical and chemical signatures of the origins and early development of life, and of how life processes transformed marine, non-marine and terrestrial environments, are entombed in Archaean sediments. These questions attract researchers from diverse fields worldwide to collaborate in deciphering the chronology and implications of Archaean ecosystem development and its complex environmental context. This research, involving multiple proxies and a wide range of expertise, requires a unified approach to critically evaluate the evidence and gain integrated insights into its implications and significance. These changes during the Archaean set the scene for the evolution of life and earth surface environments for the remainder of Earth history, and provide a wide range of fertile and rapidly advancing areas for global research.

Origin and evolution of the Crust-Mantle reservoirs during the Hadean to Archean.

Rajneesh Bhutani

rbhutani@gmail.com

(India)


J S Ray

(India)


Rajneesh Bhutani utilizes the tools of isotopes and elemental chemistry to understand the evolution of crust-mantle system through geological time in different tectonic settings.

J S Ray is an isotope geochemist, who uses stable and radiogenic isotopes and trace elements to understand mantle processes and its chemical evolution through time since Hadean.

Hadean, Archaean, crustal evolution, mantle geochemistry, radiogenic isotopes.


The unique TTG-greenstone rock association in the Archean terranes all over the globe warrants to invoke Solid-Earth processes which are different from the post-Archean period. The preserved rock-record of Archean period is built on the legacy of the Hadean crust-mantle system. However, this legacy can only be deciphered through the indirect elemental and isotopic evidences as the Hadean rock-record is not preserved. This calls for untangling of the record which is complicated due to the superimposition of the post-Archean geological processes.

Recent studies using the short-lived isotope-systems such as 146Sm-142Nd have suggested stagnant lid-mantle interaction during the early Earth history. The TTGs are also likely originated by melting of the hydrous basalts not related to the Plate- Tectonics. We also have evidences to indicate that the mantle was chemically not as homogenous during the early history of the Earth as was believed earlier.

It is, therefore, important to retrieve more information about the mantle-crust system during the Hadean-Archean to understand the underlying tectonic processes and also to understand the pathways that led to the formation of the modern crust-mantle reservoirs.

This session/symposium aims to gather geochemists, petrologists mineralogists and geodynamics experts, that work in different Archean terranes to exchange their ideas in order to evolve a better line of inquiry and understanding of the crust-mantle system during the Hadean-Archean.