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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

3

Proterozoic Earth


Prof. P. P. Chakraborty

parthageology@gmail.com

(India)


Prof. V. Ravikant

ravikant.vadlamani@gmail.com

(India)


Prof. Abhijit Basu (USA) basu@indiana.edu

(USA)

6

Proterozoic Orogenesis and Supercontinent Formation and Breakup

Elton Luiz Dantas, Elton@unb.br

(Brazil)


Elton Luiz dantas

1. Tectono-magmatism

2.U-Pb and Sm-Nd geochronology








Proterozoic, Supercontinent, Orogenesis

This Symposium intends to focus on magmatometamorphic evolution of different types of Proterozoic orogenies that include continent-continent collision, Andean-type and Cordilleran-type accretionary orogens. The geodynamic constraints inferred from this would be interpreted in the context of supercontinent assembly and breakup, essentially being Paleoproterozoic Columbia/Nuna, Mesoproterozoic Rodinia and younger Neoproterozoic events preceding formation of Gondwana. The questions that this Symposium would invite and discuss would be related to Proterozoic hot orogenesis in contrast to Himalayan-style cold continent-collision.

Proterozoic Orogeny and Sedimentary Basins

Nick MW Roberts, nickmwroberts@gmail.com, nirob@bgs.ac.uk

(UK)

Nick MW Roberts

1. Zircon geochronology, Monazite petrochronology

2. Supercontinent, Arc magmatism


Proterozoic, Orogeny, Sedimentary basins

Establishing the relation between orogeny and sedimentation is one of the most challenging endeavours in Proterozoic geology. Sedimentary successions involved in Paleoproterozoic orogenesis and undeformed successions span over the time-scale during the entire Boring Billion (1.78 to 0.85 Ga) are considered as

most diverse and a storehouse of clues to Proterozoic evolution of oceans, atmosphere and life. The symposia will address conventional, recent and novel approaches towards high-precision geochronometry of Proterozoic sedimentary successions, developing novel geochronological methodologies and dating Proterozoic mineralization.

Nuances of Sedimentation in Proterozoic Cratonic basins

Pradip K. Bose, jugeopkb@gmail.com

(India)


Prof. Pradip K. Bose

1. Sequence analysis in Precambrian

2. Effect of microbial mat on Proterozoic siliciclastic sedimentation



Proterozoic, sedimentation, cratonic basins

Although similarities between depositional processes and products on basin-filling and evolution appear to have enjoyed great uniformity throughout the sedimentary rock record, a noticeable distinction exists in the rates and intensities of a broad range of geological processes in the Precambrian epoch. Periodic elevated global sea level, aggressive weathering regime at elevated temperature, humid paleoclimate and absence of land plant mark Proterozoic continental sedimentation. In shallow marine set up, biological mediation of chemical sedimentation dominated by microbial biota.

Also, a global stratigraphic database for the Proterozoic Eon will allow ready correlation of rock units and tectonic settings across the world’s cratons. The symposia willl strive to address all such issues of the Proterozoic Earth.

Proterozoic Ocean; Chemistry and Oxygenation

Partha Pratim Chakraborty

parthageology@gmail.com

(India)


Partha Chakraborty

  1. Precambrian sedimentologist

  2. Proterozoic ocean chemistry and oxygenation



Proterozoic, Ocean, Oxygenation, Chemistry

The Proterozoic Eon marks the transition from an anoxic Archean to oxic Phanerozoic ocean –atmosphere system. Although oxygenation of deep ocean began at C. 1.8 Ga, recent studies on biomarkers of sulfur bacteria, molybdenum, sulfur and chromium isotope compositions of black shales, pyrites and ironstones strongly advocate that despite oxygenation of shallow ocean, the deep ocean remained largely in sulfidic-anoxic state throughout the Mesoproterozoic and parts of the Neoproterozoic period until the pO2 approached near modern level after c. 1Ga. This symposium will explore various proxies of Proterozoic ocean chemistry and oxygenation and their validity in local/global scale.

Proterozoic atmosphere and Expressions of Life

Joydip Mukhopadhyay

Joydip17@gmail.com

(India)


J. William Schopf

1. Early life,

2. Biomolecule



Proterozoic, atmosphere, Oxygenation, Life

Starting from Great Oxidation Event (GOE), increase of oxygen pressure through the Proterozoic time remains a subject of discussion. It is believed that atmospheric oxygen levels rose twice in the Proterozoic Eon, between 2.47 and 2.32 Ga and after 0.8 Ga. The two billion years’ delay in build-up of oxygen pressure in the sea and air up to modern level is tied with life in cause-effect relation. Alternatively, views are also expressed that appearance and diversification of life may be linked with genetic and /or developmental innovation in the biosphere and independent of any environmental control. The symposium will explore all aspects of complex relationship between life and atmosphere/ hydrosphere oxidation.

Proterozoic Geodynamics and Subcontinental Lithosphere (SCLM) Evolution from Geochemical Evolution of Magmatism Over Time

Peng Peng, pengpengwj@mail.iggcas.ac.cn

(China)


Peng Peng

1. SIMS U-Pb

2. Mafic dyke

Proterozoic, geodynamics, magmatism, Lithosphere

The response to the high heat flow during Paleoproterozoic time had resulted in intraplate mafic magmatism manifested in emplacement of several continental-scale dyke swarms, large mafic-ultramafic layered complexes and alkaline ultramafic dykes and rocks of the carbonatite-kimberlite and lamprophyric clans. Although volumetrically low, the detailed study of their petrology, geochronology and geochemistry, and additionally from the entrained xenoliths of a wide petrologic range, has revealed a wealth of information on the nature and evolution of the Subcontinental Lithospheric Mantle (SCLM), which otherwise would have remained less known. This Symposium would focus on recent advances in our understanding the SCLM evolution and also bring together specific high quality geochemical and isotopic information on the host and xenoliths that would constrain older Archean-aged geodynamic events. Furthermore, several felsic granitoid rocks, termed as anorogenic types, have been recorded from cratons that would imply the role of mantle heating in their generation. The study and documentation of these have provided clues to the existence paleo plumes and the attendant crust-mantle interaction.