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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




Metamorphic Processes and Petrogenesis

Prof. Somnath Dasgupta


Prof. Santanu K. Bhowmik


Prof. G. Clarke



Accessory Minerals to Metamorphic Processes: Trace Elemental and Isotopic Insights

Craig Storey


James Darling


Craig Storey

1. LA-ICPMS development of in-situ isotope ratio analysis in accessory minerals

2. Evolution of the continental crust

3. High-pressure metamorphism and subduction zone processes

James Darling

1. EBSD applied to shock metamorphism in accessory minerals 2. Atom-Probe tomography of accessory minerals

3. Geochronology of meteorites

Accessory minerals, trace elements, geochronology, metamorphism, diffusion

Accessory minerals provide robust archives of trace elements and isotope ratios that can help understand a whole range of Earth and planetary processes, and provide timescales and rates. In this symposium, we will explore the utility and ground-breaking potential of a whole range of accessory minerals within rocks that have experienced metamorphic and associated processes, such as brittle and crystal-plastic deformation, at the whole range of P-T conditions possible in the Solar System. We invite novel applications, novel techniques and innovative approaches to the use of accessory minerals in Earth and planetary science, from the nano-scale to the bulkmineral high-precision isotope ratio scale.

Early Earth Orogenesis

Santanu K. Bhowmik


Sankar Bose


1. Santanu Kumar Bhowmik

  • Professor at IIT Kharagpur with more than 20 years of research experience on metamorphic processes in Precambrian and Phanerozoic continental collisional and subduction zone tectonic settings.

  • Over thirty research publications on different aspects of metamorphic petrology

  • Fellow of Indian Academy of Sciences.

2. Sankar Bose

  • Professor at Presidency University with more than 20 years of research experience on metamorphic processes in Precambrian orogenic belts.

  • Over forty research publications on different aspects of metamorphic petrology

  • Recipient of National Geoscience Award

Metamorphism, early earth, orogenesis, plate tectonics, geochemistry, geochronology, thermo-mechanical modelling

The symposium calls for contributions on early earth orogenesis centering on when, how and why did the "modern-style" plate tectonics begin on the planet earth. Despite divergent opinions, there is a general consensus that the switch over from "pre-subduction", plume-driven vertical tectonics to "modern subduction" regime of horizontal plate motions is linked with a change in thermal regime from one of heat generation through radioactive decay to heat loss by conductive cooling. The tectonic transition that is said to coincide with the first appearance of an arc-back arc system, the earliest record of eclogite, the advent of a dual thermal regime, reflecting unequivocal convergent plate margin processes and changes in crustal growth rate and petrotectonic assemblages (e.g. from tonalite – trondhjemite to potassic granites and from mafic, komatiitic greenstone belts to less mafic ones) appears to have taken place in the time period between 3.2 and 2.8 Ga. We encourage theoretical, high-precision analytical, experimental and fieldbased contributions from the fields of metamorphic petrology, geochemistry, geochronology, diffusion chronometry and thermo-mechanical modelling, primarily addressing "early Earth" tectonic processes. The session focuses on studies from low- to high-grade Archaean to Earliest Palaeoproterozoic metamorphic terrains in a range of topics from phase equilibria modelling, metamorphic P-T-t paths, timescales of orogenesis to geochemical and isotopic fingerprinting of tectonic settings.

Metamorphism at Convergent Plate Margins: Tales from the Upper Plate

Richard Mark Palin (USA)

Nick Roberts


Richard Palin

  • PhD from the University of Oxford, UK, studying the thermal and structural evolution of collisional mountain belts (Himalayan Range and Tibetan Plateau)

  • Editorial board member for Precambrian Research and Associate Editor for Geoscience Frontiers

  • Twenty-four publications since 2012, including articles in Nature and Nature Geoscience

Nick Roberts

  • Manager of LA-ICP-MS laboratory with expertise in geochronology and isotope geochemistry applied to a range of solid earth topics

  • Research interests in the rates and timing of deformation and orogenesis, and the evolution of the continental crust

  • Author of seventy publications, Editorial board member for Geology, and Associate Editor for Geoscience Frontiers

Metamorphism, anatexis, continental crust, orogenesis, plate tectonics

Convergent plate margins are sites of intense deformation, magmatism, and metamorphism, where significant heat, fluid, and mass transfer may take place during orogenesis. Quantifying the fluxes and drivers of such processes during

plate convergence is critical to understand the geodynamical evolution of the lithosphere, the rates and mechanisms of metamorphism at elevated pressure and temperature conditions, and for constraining the nature of mountain building through geological time, whether collisional or accretional in nature.

This session seeks contributions that investigate the causes, effects, and petrological or tectono-thermalimplications of regional or contact metamorphism at convergent margins, focusing on continental crustal materials. We welcome and encourage abstracts that use a variety of techniques, such as field mapping, phase equilibria modeling, petrochronology, geochemistry, and geodynamic and/or geophysical modelling, and studies that span a wide range of spatial and temporal scales.

Characterization, Duration, Tectonics and Implications of Ultrahigh Temperature Metamorphism

Somnath Dasgupta


Pulak Sengupta (India)

1. Somnath Dasgupta, Visiting Professor, IISER-Kolkata, former Professor at Jadavpur University, 30 years of research experience on ultrahigh temperature metamorphosed rocks of India with over 60 international publications in the subject, Fellow of all Science Academies of India and of TWAS and Alexander von Humboldt Foundation.

2. Pulak Sengupta, Professor at Jadavpur University, 20 years of research experience on ultrahigh temperature metamorphosed rocks of India, over 35 research publications on the subject, Bhatnagar awardee, Fellow of Indian National Science Academy, Indian Academy of Sciences and Alexander von Humboldt Foundation

UHT metamorphism, phase equilibria, tectonics, duration and implications in supercontinent assembly

Crustal metamorphism with peak temperatures exceeding 900oC, and locally reaching 1000oC or more, first documented from the Napier Complex about half a century back, is an established phenomenon. Recent compilations show more than 60 such UHT terranes the world over. Major advances have been made in recent years towards understanding the cause(s) of extreme thermal perturbation mostly at lower crustal levels and the possible tectonic scenarios. Discovery and calibrations of new trace element geothermometers improved measurement of temperatures, and phase equilibria modeling helped to document peak thermobaric conditions, P-T path of evolution, role of melting and melt segregation, collectively indicating possible tectonic environments. Improved geochronological techniques, particularly at such high temperatures, provided constraints on both timing and duration of UHT metamorphism. UHT metamorphosed terranes provide important clues regarding supercontinent assembly in the geological past. Despite these advances, major outstanding questions remain: (a) how efficient are the trace element geothermometers ?, (b) is UHT metamorphism short-lived and repetitive or long-lived ?, (c) what is the role of melt segregation in preservation of UHT assemblages? , (d) how efficient is the pseudosection approach in phase equilibria modeling, given the inherent uncertainties in bulk chemical approximation (water content and effect of melt segregation)?, (e) what is the significance of diverse kinds of retrograde P-T paths in terms of tectonic settings? (f) what is the rate of uplift and exhumation of UHT metamorphosed lower crust? The above points are illustrative, but not exhaustive. Given that several UHT metamorphosed terranes have been described from India, the symposium is expected to draw wide attention both nationally and internationally.

HP- to UHP Metamorphism: From small Scale Observations to Mountain Forming Processes

Hans-Peter Schertl


Jingsui Yang


Hans-Peter Schertl

  • Research interests in petrology, geochemistry, and geochronology of HP- and UHP-metamorphic rocks; cathodoluminescence microscopy and spectroscopy.

  • Author of 63 publications, 7 books/chapters in books. Editorial board member ofJournal of Earth Science

  • Secretary: International Mineralogical Association (IMA), Fellow: Mineralogical Society of America, Adjunct Professor: College of Earth Science and Engineering, Shandong University of Science and Technology

Jingsui Yang

  • Research interests in mafic-ultramafic rocks and HP- and UHP-metamorphic rocks, mantle rocks and related chromite deposits, ophiolite and plate tectonics.

  • Author of 150 publications, 4 books/chapters in books. Editorial board member ofActa of Geologic Sinica.

  • Fellow ofMineralogical Society of America, Fellow of Geological Society of America,Academician of Chinese Academy of Sciences.

Metamorphism, deep subduction, continental crust,diamond/coesite, UHP-ophiolite

A dramatic increase in current research on HP- and UHP- metamorphism reflects their significance in deciphering lithosphere evolution, and 30-35 years after the first discoveries of coesite and diamond in metamorphic rocks we now have completely different view on processes such as mantle dynamics, crustal tectonics and fluid-rock interaction during subduction, collision and exhumation, crust-mantle interaction in subduction zones. Recently a completely new field of research has also developed as a result of the discoveries of UHP minerals and assemblages in ophiolitic bodies in Tibet (Luobusa) and the Polar Urals (Ray-Iz).

Many of these new findings triggered further experimental studies and modeling; intensified future research should allow a better understanding of processes such as the subduction of oceanic and continental lithosphere, recycling of surface carbon and fluids to mantle depths, and later ascent towards the Earth’s surface.

This session welcomes contributions from small scale observations, for instance using X-ray, FTIR, Raman, TEM, Laser ICP-MS, SHRIMP, etc. techniques, to mountain forming process that include field studies, the derivation of pressure temperature paths, geodynamic modeling, geochemistry as well as age dating and fluid inclusion studies. We appreciate not only abstracts related to natural rocks but also to HP/UHP related experiments.

Metamorphic Products of Lithospheric Convergence: Subduction Zones

Philippe Agard (France)

Sarah Penniston-Dorland


Philippe Agard

  • PhD at Ecole Normale Supérieure and University Pierre et Marie Curie, France, studying the structural and metamorphic evolution of subducted rocks from the Western Alps

  • Research interests in subduction processes at all scales

  • Author of seventy-five publications, Editor in chief of Tectonophysics

Sarah Penniston-Dorland

  • PhD from Johns Hopkins University, USA, studying element mobility and transport scales duringregional metamorphism

  • Research interests in subduction-zone mineral transformations, in particular fluid-mediated processes

  • Author of twenty five publications, Associate Editor for American Mineralogist

Metamorphism, geodynamics, fluid/mass transfer, rheology

Whilst critical for our understanding of subduction zone geodynamics and related hazard, the nature, structure and properties of the subduction plate boundary are still largely unknown. Determining which lithologies and rheological behaviours prevail, which are the fluids and where, or what is their exact

bearing on earthquake ruptures remains a real challenge. Metamorphic rocks are increasingly used as probes to image and understand physical conditions and processes at work along the subduction boundary at all relevant spatial and temporal scales (i.e., years and meters across all depths). Mineral transformations tightly control both deformation and element transfer along the slab, to the arc and to the deeper mantle. We welcome in this session all contributions aiming at integrating structural, petrological, mineralogical and geochemical data with particular emphasis on bridging the gap between observations made at rock and plate scale, from millions of years to a few hundred years only, and with interest in relating these findings with geophysical or numerical modelling data.