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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

11

The Himalayas – Anatomy of an Evolving Mountain Chain


Prof. A. K. Jain

himalfes@iitr.ernet.in

(India)


Prof. Talat Ahmad

tahmad001@gmail.com

(India)


Prof. Saibal Gupta

saibl@gg.iitkgp.ernet.in

(India)


N. B. W. Harris n.b.w.harris@open.ac.uk

(UK)


Prof. Qasim Jan mqjan@yahoo.com

(Pakistan)


Prof. Ranjan Kumar Dahal rkdahal@gmail.com

(Nepal)

6

Thermal Evolution of the Himalaya

Daniela Rubatto Daniela.rubatto@geo.unibe.ch;

(Switzerland)


Sumit Chakraborty,

(Germany)

1. Her areas of interest and expertise are isotope geochemistry, geochronology and tectonics in orogenic belts. She has published recently on the timescales of melting in the Himalaya.

2. His area of expertise is primarily diffusion in minerals, and the kinetics of metamorphic processes. He has an excellent record of work on the Sikkim Himalaya.

Metamorphism, exhumation, thermal evolution

The Himalayas represent one of the best modern laboratories to study the evolution of thermal structure of an orogen during the collision between two continental plates. Collision leads to crustal thickening, which in turn causes temperature changes in the lower and mid crust as a consequence of enhanced radiogenic heating, in places resulting in melting of crustal domains. The topography generated by collision is simultaneously moderated by erosion and extension. These processes influence the thermal evolution of the deep crust, manifested in the form of phenomena such as inverted metamorphism and leucogranite production. Pressure-temperature-deformation-time paths extracted from responsive lithologies provide insight into the orogen’s interior, and record the thermal evolution of the crust as orogeny progresses. This symposium intends to cover a broad range of topics related to the thermal evolution of the Himalayan orogen, including metamorphism, syn- to post- collisional magmatism and geochronology.

The Himalaya - Surface processes

George Mathew
gmathew@iitb.ac.in

(India)

He specializes in Quaternary geochronology, Thermochronology and active tectonics, and has been working on these aspects in the Arunachal Himalaya

Fluvial geochemistry; tectonic geomorphology; sedimentation; thermochronology; Quaternary geochronology

Erosion and exhumation are processes that are intimately related to orogeny. Erosion and neotectonic activity drives present-day uplift and exhuhmation of the Himalaya, leaving signatures in the form of geomorphic features such as incised gorges, undercut river valleys and terraces. Rates of such uplift can be constrained using a variety of thermochronological techniques. Enhanced erosion leads to a corresponding material influx into Himalayan rivers and streams, and the geochemistry of waters within the fluvial systems can serve as an efficient monitor of erosion rates. The rate at which erosion and denudation occur impact global climate, through processes including silicate weathering and burial of organic carbon, although the extent to which climate is so influenced is disputed. This symposium intends to discuss all erosional and exhumation processes including the sedimentary record, thermochronological constraints on uplift and exhumation rates, detrital mineral studies in Himalayan rivers and fluvial weathering chemistry and its ancilliary effects on climate.

Geodynamics of the Himalayas

Vineet Gahalaut vkgahalaut@yahoo.com

(India)



Crustal deformation; earthquakes; landscape evolution; structural geometry of Himalaya; geodesy in the Himalaya

The Himalayas represent an unrivalled case study for understanding the mechanisms of continent-continent collision. The classical model for creating the Himalayan orogen involves rapid northward movement of a fast moving Indian plate and subduction of the Tethys ocean, before the Indian continent finally collided with Eurasia. Shortening related to this convergence continues today, and the crustal deformation is primarily accommodated on a number of Himalayan discontinuities. Recent careful geodetic measurements confirmed that the total shortening is not limited to the Himalayan region, but is also accommodated within Tibet and the Indian peninsula. This symposium intends to discuss regional tectonics and geophysical studies relating to tectonic plates in the context of the Himalaya. We welcome results from geodetic studies of the deformation of the Indian and Eurasian plates, from seismological studies of recent and past Himalayan earthquakes.

Structure - Linking brittle and ductile structures in the Himalaya through field studies and experiments

Santanu Bose

bose.santanu@gmail.com

(India)


Rodolpho Carosi

(Italy)

1. He has worked extensively on numerical and analogue modelling of geological structures. He is currently actively involved in, and has published on models that are directly related to the Himalayan structures.

2. He specialises in continental tectonics and has published extensively on Himalayan faults and shear zones.

Continental collision tectonics; Himalayan discontinuities; shear zones and faults in Himalaya; numerical modelling; analogue modeling

The Himalaya is a natural laboratory for understanding orogenic processes. A unified theory of Himalayan evolution that links extreme topography with subsurface processes remains elusive. The two competing hypotheses, channel flow and wedge tectonics, provide alternative explanations for the development of the Greater Himalayan Sequence, both with respect to its exhumation and topography. None of these models give importance to the role played by the regionally occurring ductile fabrics (e.g. foliations), and their potential link with Himalayan thrusts (e.g., MCT, Ramgarh, and MBT). This symposium intends to examine the cause of varying pattern of deformation over spatial and temporal scales in the Himalayan belt. We invite new results that discuss the link between the regionally occurring ductile structures and brittle faulting, and the exhumation of the Greater Himalayan Sequence in the framework of Himalayan orogeny. The symposium will encompass field, experimental and numerical studies on the Himalaya, focusing largely on faults, shear zones and modelling studies.




Tectonic Evolution of the Himalaya

Talat Ahmad

tahmad001@gmail.com

(India),


Mike Searle

(UK)


Rodolfo Carosi

(Italy)

Peter Cawood (Australia)


Mike is a Professor of Earth Sciences at the University of Oxford focused on understanding the evolution of orogenic systems worldwide. His avid love of mountaineering morphed into a love of geology and mountain systems. He did an undergraduate degree in geology at Aberystwyth University in Wales and a PhD at the Open University studying the metamorphic sole of the Semail ophiolite in Oman. For the past 30 years he has studied the geology of the UAE/Oman ophiolite, Himalaya, Karakoram, Tibet, and Southeast Asia


This sympoium will cover the geological evolution of the entire Himalaya chain including Indus suture zone, Tethyan Himalaya, Great Himalayan metamorphic sequence (GHS), Lesser Himalaya (LH) fold-thrust belt and the Siwalik molasses basin. Processes to be covered include timing of the India-Asia collision, ophiolite obduction, island arcs within Tethys, pre- and post-collision sedimentary record, crustal shortening and structural evolution, metamorphic evolution, crustal melting and leucogranite formation.

Ophiolites


Yildrim Dilek dileky@miamioh.edu

(USA)