Scientific Committee for Antarctic Research: 11th International Symposium on Antarctic Earth Sciences
ISAES 11 – Edinburgh 2011 – July 10‐15th Organizing Committee Martin Siegert Chair of ISAES 11 Tom Bradwell Symposium co‐ordinator Celia Lloyd Conference management (Intelligent Events) Linda Capper Media & Outreach Mike Curtis Development Athena Dinar Public Events Mike Hambrey Publications Barbara McKerrow Administration Sian Henley Early Career Rep Kathryn Rose Posters Neil Ross Web manager Treasurer Mike Sparrow Alex Tate Sponsorship Alan Vaughan Publications Scientific Steering Committee Mike Curtis Colm Ó Cofaigh Jane Francis David Sugden Mike Hambrey Alex Tate Simon Harley Martyn Tranter Dominic Hodgson Alan Vaughan Nick Hulton Eric Wolff Raja Ganeshram Martin Siegert (convenor) Matt King Tom Bradwell (convenor)
Sponsors Scientific Committee for Antarctic Research (SCAR) University of Edinburgh British Geological Survey British Antarctic Survey Scottish Alliance for Geoscience, Environment and Society (SAGES)
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Dear Colleagues It’s with great pleasure that I welcome you to Edinburgh for the 11th International Symposium on Antarctic Earth Sciences. As many of you will know Edinburgh is the birthplace of modern geosciences, based on the late 18th century work by James Hutton on Salisbury Crags – in whose shadow our venue lies. Hutton’s work challenged orthodoxy and encouraged new thinking; characteristics that are as important today as they were 200 years ago. As we shall see this week, Antarctic Earth Sciences are at the centre of major global issues and cutting‐ edge discovery. The opportunity in front of us is to share knowledge, exchange ideas and plan for the future. We have an exciting programme in all aspects of Antarctic Earth Sciences, with sixteen plenary lectures and twenty‐two sessions (scheduled in three parallel rooms) over five days that reflect the most vibrant areas in our research. The organisation of a major scientific symposium requires a major effort from a team of people. Although I chair the symposium, most of the burden has fallen largely to my colleagues from the British Geological Survey (Tom Bradwell and Barbara McKerrow), the British Antarctic Survey (Linda Capper, Alan Vaughan among several others) and my colleagues from the University of Edinburgh (Neil Ross and Sian Henley). I extend my thanks to all involved in the organisation and science committees for their fine effort, which has made ISAES XI possible. We are also grateful to Celia Lloyd and Intelligent Events for so ably supporting us through the planning process. The scientific committee, which I convened with Tom Bradwell, took care of organising a very interesting scientific program. I therefore wish to thank all those involved in the committee who have ensured that we have a programme of speakers embracing both leading and emerging scientists. I also wish to thank our sponsors (the University of Edinburgh; British Geological Survey; British Antarctic Survey; and the Scottish Alliance of Geosciences Environment and Society) and, in particular, the John McIntyre Conference Centre for support and flexibility during the preparation of the Symposium. We have attracted more than 500 delegates from 25 countries to the conference, producing 580 abstracts. The symposium will involve 251 oral presentations and 313 posters I anticipate that ISAES XI will be scientifically and socially a memorable conference in Edinburgh. I hope you enjoy it and return home invigorated with new ideas and links with fellow scientists. Martin Siegert
CONTENTS
Plenary Session abstracts Parallel Sessions
7‐22
1. Neogene Climate Evolution and Ice Sheet Response, an Antarctic margin perspective 2. 3. 4. 5. 6. 7. 8. 9. 10. 11. 12. 13. 14. 15. 16. 17. 18. 19. 20. 21. 22.
Page
Antarctica and Supercontinent Evolution Antarctic Ice Sheet and the Southern Ocean The Scotia Sea Role of Mesozoic and Cenozoic Magmatism in the Evolution of Antarctica Circum‐Antarctic Stratigraphic and Palaeobathymetric Reconstructions Antarctic Climate Variability During the Holocene Antarctic Permafrost, Periglacial & Ice Free Areas Antarctic subglacial lakes and continental‐scale basal hydrology Antarctic data, collections and maps Tectonic Evolution of Antarctic seaways and margins during the Mesozoic and Cenozoic and its influence on biota and climate Glacial Geology: processes and products, with particular emphasis on cold‐based Glaciers New Insights into the Cenozoic History of the Wilkes Land Antarctic Margin – Consequences for Biotic, Oceanographic and Climatic Evolution New frontiers and interdisciplinary advances in Antarctic Science Observation and modelling of POLENET data Geological controls on modern and past Antarctic bottom water and marine Environment Unravelling the geologic, climatic and topographic evolution of Antarctica Uncovering & Unveiling Antarctica Ice Sheet Quaternary History Origin & Evolution of Modern Biota Austral Portals Evolution of Life, Environments and climates in Antarctica from deep time to the present
24‐41 42‐59 60‐70 71‐76 77‐88 89‐94 95‐111 112‐129 130‐141 142‐152 153‐163 164‐169 170‐181 182‐187 188‐198 199‐204 205‐216 217‐234 235‐252 253‐258 259‐264 265‐270
Posters Neogene Climate Evolution and Ice Sheet Response, an Antarctic margin perspective Antarctica and Supercontinent Evolution Antarctic ice sheet and the Southern Ocean The Scotia Sea Role of Mesozoic and Cenozoic Magmatism in the Evolution of Antarctica Circum‐Antarctic Stratigraphic and Palaeobathymetric Reconstructions Antarctic Climate Variability During the Holocene Antarctic Permafrost, Periglacial & Ice Free Areas Antarctic subglacial lakes and continental‐scale basal hydrology Antarctic data, collections and maps Tectonic Evolution of Antarctic seaways and margins during the Mesozoic and Cenozoic and its influence on biota and climate 12. Glacial Geology: processes and products, with particular emphasis on cold‐based Glaciers 13. New Insights into the Cenozoic History of the Wilkes Land Antarctic Margin – Consequences for Biotic, Oceanographic and Climatic Evolution 14. New frontiers and interdisciplinary advances in Antarctic Science 1. 2. 3. 4. 5. 6. 7. 8. 9. 10. 11.
272‐285 286‐313 314‐320 321‐324 325‐335 336‐340 341‐365 366‐385 386‐394 395‐414 415‐429 430‐435 436‐450 451‐457 4
15. Observation and modelling of POLENET data 16. Geological controls on modern and past Antarctic bottom water and marine Environment 17. Unravelling the geologic, climatic and topographic evolution of Antarctica 18. Uncovering & Unveiling Antarctica 19. Ice Sheet Quaternary History 20. Origin & Evolution of Modern Biota 21. Austral Portals 22. Evolution of Life, Environments and climates in Antarctica from deep time to the present 23. Open Poster abstracts
458‐470 471‐473 474‐482 483‐508 509‐526 527‐530 531‐534 535‐550 551‐573
Index of Authors
575‐596
Abstract Codes PL – Plenary Lectures PS – Parallel Symposia PO – Poster Abstracts Presenting author underlined
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PS2.18 Spatio‐temporal and palaeomagnetic evidence for the Palaeoproterozoic supercontinental assembly of the Napier Complex of East Antarctica and the Southern India and Western Australia cratons S. Mohanty Department of Applied Geology, Indian School of Mines, Dhanbad 826004, India
[email protected]
The models for Rodinia, a ~1000 Ma supercontinent, show juxtapositions of the Enderby Land of East Antarctica, the Dharwar–Bastar cratons of South India and the Yilgarn craton of Western Australia. However, the Napier Complex of the Enderby Land has evolutionary history earlier than the adjacent areas of the Rayner Complex; both the areas were amalgamated during the Rayner Orogeny at ~1000 Ma. The present study examines the possibility of the joint evolution of the Napier Complex with the South Indian cratons prior to the Grenvillean orogeny, which gave rise to the Eastern Ghats Orogen along the east coast of India in the Rodinian configuration. A detailed examination of lithostratigraphy, tectono‐thermal history, and geochronological database of the Yilgarn craton, the South Indian cratons, and the East Antarctic shield shows a broad similarity. Analyses of palaeomagnetic data of ~2400 Ma age mafic dykes from the Dharwar craton, the Yilgarn craton and the Mt. Riiser–Larsen area of the Napier Complex suggest their nearest‐neighbor positions. Matching patterns of >2400 ma old craton outlines, orientation of mafic dyke swarms and paleo‐north directions for ~2400 Ma age have established a continental assembly of the South India, the Western Australia, and the Napier Complex at ~2400 Ma. In this assembly the outlines of the Napier Complex matches with outline of the Dharwar craton of South India at the position of the Cuddapah basin. The schist belts of the Dharwar craton are found to continue along strike into the Napier Complex. Both the areas have high volumes of ~2500 Ma old granites, high‐grade of metamorphism at ~2500 Ma, matching trends of mafic dykes and matching orientations of the north direction at ~2400 Ma. The separation of the Napier Complex from the South Indian block is interpreted to be the causative factor for the development of the Cuddapah basin at ~1,950 Ma.
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