ALBERT

Description / Table of Contents: Geoscientists need to familiarize themselves with the characteristics of actual plate motions. A popular, current thesis relates the state of stress to the degree of coupling of the two convergent plates. Recent two-dimentional, finite element modelling has demonstrated how the stress in the overriding plate is critically dependent on wether the subduction zone is locked (i.e. high degree of coupling) or unlocked. Thus the compressional stress regime occurs in locked systems, and extensional strees in unlocked systems; a gradient from compression in the fore-arc to extension in the back-arc is said to characterize partially locked system. However, studies of the strain field in real cases (modern arc regions) clearly indicate the prevalence of subhorizontal extension orientated nearly perpendicular to the arc. Implicit in these real observations is the suggestion that stresses resulting from plate coupling are either not transmitted to the volcanic arc, or else locked subduction zones are uncommon and extension may be the normal mode of behaviour. The rationale and evidence for extension and coeval volcanism at consuming plate margins is presented. Using mainly Cenozoic case histories for oceanic and continental margin arcs, structural evidence is presented, which demonstrates that volcanism in most arc systems is contemporaneous with normal faulting and subsidence as a general case. Representive, modern geochemical data sets are provided and integrated in a petrological discussion for each case history. The western Pacific, now widely regard as a type region for the study of convergent plate margin processes, is particularly well represented. Also included is evidence from less commonly insvestigated regions, where subduction has ceased or is no longer obvious but an association with an arc is unequivocal. By these means, it is hoped that this volume contains a representative cross-section of current research on extension-related arc volcanism in broadest sense, and that it will stimulate further discussion and research into the complex tectonics and petrology of covergent plate margins.

Description / Table of Contents: Introduction --- Antarctic Palaeoenvironments and Earth-Surface Processes in context / Michael J. Hambrey and Bethan J. Davies / Geological Society, London, Special Publications, 381, 1-5, 24 September 2013, https://doi.org/10.1144/SP381.27 --- A. Palaeozoic and Mesozoic evolution of the Antarctic Continent --- The geological and tectonic evolution of the Transantarctic Mountains: a review / David H. Elliot / Geological Society, London, Special Publications, 381, 7-35, 1 July 2013, https://doi.org/10.1144/SP381.14 --- Differential Movement across Byrd Glacier, Antarctica, as indicated by Apatite (U–Th)/He thermochronology and geomorphological analysis / D. J. Foley, E. Stump, M. van Soest, K. X. Whipple and K. V. Hodges / Geological Society, London, Special Publications, 381, 37-43, 6 August 2013, https://doi.org/10.1144/SP381.25 --- Mesozoic to recent evolution of intraplate stress fields under multiple remote stresses: The case of Signy Island (South Orkney Microcontinent, Antarctica) / A. Maestro, J. López-Martínez and F. Bohoyo / Geological Society, London, Special Publications, 381, 45-65, 19 April 2013, https://doi.org/10.1144/SP381.4 --- The Taylor Group (Beacon Supergroup): the Devonian sediments of Antarctica / Margaret A. Bradshaw / Geological Society, London, Special Publications, 381, 67-97, 6 August 2013, https://doi.org/10.1144/SP381.23 --- Late Cretaceous dinosaurs from the James Ross Basin, West Antarctica / Marcelo A. Reguero, Claudia P. Tambussi, Rodolfo A. Coria and Sergio A. Marenssi / Geological Society, London, Special Publications, 381, 99-116, 24 July 2013, https://doi.org/10.1144/SP381.20 --- Palaeobiogeography of Austral echinoid faunas: a first quantitative approach / Thomas Saucede, Benjamin Pierrat, Arnaud Brayard and Bruno David / Geological Society, London, Special Publications, 381, 117-127, 19 April 2013, https://doi.org/10.1144/SP381.6 --- B. Cenozoic glaciation and impacts --- Taxonomic diversity of Eocene Antarctic penguins: a changing picture / Piotr Jadwiszczak / Geological Society, London, Special Publications, 381, 129-138, 24 June 2013, https://doi.org/10.1144/SP381.7 --- Heat-flow determinations of basement age in small oceanic basins of the southern central Scotia Sea / P. F. Barker, L. A. Lawver and R. D. Larter / Geological Society, London, Special Publications, 381, 139-150, 19 April 2013, https://doi.org/10.1144/SP381.3 --- Cenozoic landscape and ice drainage evolution in the Lambert Glacier–Amery Ice Shelf system / Duanne A. White / Geological Society, London, Special Publications, 381, 151-165, 1 July 2013, https://doi.org/10.1144/SP381.15 --- History of the grounded ice sheet in the Ross Sea sector of Antarctica during the Last Glacial Maximum and the last termination / Brenda L. Hall, George H. Denton, John O. Stone and Howard Conway / Geological Society, London, Special Publications, 381, 167-181, 19 April 2013, https://doi.org/10.1144/SP381.5 --- Late Eocene Glaciofluvial to Glaciomarine transition in the Lambert Graben: constraints from lithofacies and mineralogy of ODP Site 1166 sediments, Prydz Bay, Antarctica / K. Strand, J. Köykkä and J. Lamminen / Geological Society, London, Special Publications, 381, 183-197, 30 July 2013, https://doi.org/10.1144/SP381.24 --- The Offshore New Harbour Project: deciphering the Middle Miocene through Late Eocene seismic stratigraphy of Offshore New Harbour, western Ross Sea, Antarctica / Stephen F. Pekar, Marvin A. Speece, Gary S. Wilson, David S. Sunwall and Kirsty J. Tinto / Geological Society, London, Special Publications, 381, 199-213, 19 April 2013, https://doi.org/10.1144/SP381.2 --- Constraints on Antarctic Ice Sheet configuration during and following the Last Glacial Maximum and its episodic contribution to sea-level rise / John B. Anderson, Alexandra E. Kirshner and Alexander R. Simms / Geological Society, London, Special Publications, 381, 215-232, 1 July 2013, https://doi.org/10.1144/SP381.13 --- Glaciomarine sedimentation dynamics of the Abbot glacial trough of the Amundsen Sea Embayment shelf, West Antarctica / Katharina Hochmuth and Karsten Gohl / Geological Society, London, Special Publications, 381, 233-244, 24 July 2013, https://doi.org/10.1144/SP381.21 --- Southern Ocean bioproductivity during the last glacial cycle – new detection method and decadal-scale insight from the Scotia Sea / D. Sprenk, M. E. Weber, G. Kuhn, P. Rosén, M. Frank, M. Molina-Kescher, V. Liebetrau and H.-G. Röhling / Geological Society, London, Special Publications, 381, 245-261, 30 July 2013, https://doi.org/10.1144/SP381.17 --- Palaeoenvironmental records from the West Antarctic Peninsula drift sediments over the last 75 ka / Maryline J. Vautravers, David A. Hodell, James E. T. Channell, Claus-Dieter Hillenbrand, Mike Hall, James Smith and Robert D. Larter / Geological Society, London, Special Publications, 381, 263-276, 5 July 2013, https://doi.org/10.1144/SP381.12 --- Provenance of Pleistocene sediments from Site U1359 of the Wilkes Land IODP Leg 318 – evidence for multiple sourcing from the East Antarctic Craton and Ross Orogen / N. C. Pant, P. Biswas, Prakash K. Shrivastava, S. Bhattacharya, Kamlesh Verma, Mayuri Pandey and Iodp Expedition 318 Scientific Party / Geological Society, London, Special Publications, 381, 277-297, 1 July 2013, https://doi.org/10.1144/SP381.11 --- C. Glacial and periglacial processes --- Geomorphological evidence of cold-based glacier activity in South Victoria Land, Antarctica / C. B. Atkins / Geological Society, London, Special Publications, 381, 299-318, 24 July 2013, https://doi.org/10.1144/SP381.18 --- A review of geomorphic processes and landforms in the Dry Valleys of southern Victoria Land: implications for evaluating climate change and ice-sheet stability / D. R. Marchant, S. L. Mackay, J. L. Lamp, A. T. Hayden and J. W. Head / Geological Society, London, Special Publications, 381, 319-352, 1 July 2013, https://doi.org/10.1144/SP381.10 --- Landscape evolution and ice-sheet behaviour in a semi-arid polar environment: James Ross Island, NE Antarctic Peninsula / Bethan J. Davies, Neil F. Glasser, Jonathan L. Carrivick, Michael J. Hambrey, John L. Smellie and Daniel Nývlt / Geological Society, London, Special Publications, 381, 353-395, 19 April 2013, https://doi.org/10.1144/SP381.1 --- Windows on Antarctic soil–landscape relationships: comparison across selected regions of Antarctica / Megan R. Balks, Jerónimo López-Martínez, Sergey V. Goryachkin, Nikita S. Mergelov, Carlos E. G. R. Schaefer, Felipe N. B. Simas, Peter C. Almond, Graeme G. C. Claridge, Malcolm Mcleod and Joshua Scarrow / Geological Society, London, Special Publications, 381, 397-410, 16 May 2013, https://doi.org/10.1144/SP381.9 --- Sedimentary processes in two different polar periglacial environments: Examples from Schirmacher Oasis and Larsemann Hills, East Antarctica / Rajesh Asthana, Prakash K. Shrivastava, M. Javed Beg, Ashit K. Swain, Amit Dharwadkar, Sandip K. Roy and Hari B. Srivastava / Geological Society, London, Special Publications, 381, 411-427, 30 July 2013, https://doi.org/10.1144/SP381.22 --- Periglacial processes and landforms of the Antarctic: a review of recent studies and directions / Kevin Hall / Geological Society, London, Special Publications, 381, 429-453, 1 July 2013, https://doi.org/10.1144/SP381.16 --- Palaeoshoreline records of glacial isostatic adjustment in the Dry Valleys region, Antarctica / Stephanie A. Konfal, T. J. Wilson and B. L. Hall / Geological Society, London, Special Publications, 381, 455-467, 30 July 2013, https://doi.org/10.1144/SP381.26 --- Characteristic atmosphere–ocean–solid earth interactions in the Antarctic coastal and marine environment inferred from seismic and infrasound recording at Syowa Station, East Antarctica / Masaki Kanao, Alessia Maggi, Yoshiaki Ishihara, Eleonore Stutzmann, Masa-Yuki Yamamoto and Genti Toyokuni / Geological Society, London, Special Publications, 381, 469-480, 16 May 2013, https://doi.org/10.1144/SP381.8 --- Evaluation of Envisat ASAR IMP imagery for snow mapping at varying spatial resolution (Deception Island, South Shetlands – Antarctica) / Carla Mora, Gonçalo Vieira and Miguel Ramos / Geological Society, London, Special Publications, 381, 481-493, 24 July 2013, https://doi.org/10.1144/SP381.19

Description / Table of Contents: This volume focuses on magmas and cryospheres on Earth and Mars and is the first publication of its kind to combine a thematic set of contributions addressing the diverse range of volcano-ice interactions known or thought to occur on both planets. Understanding those interactions is a comparatively young scientific endeavour, yet it is vitally important for a fuller comprehension of how planets work as integrated systems. It is also topical since future volcanic eruptions on Earth may contribute to melting ice sheets and thus to global sea level rise. Papers included here are likely to influence the choice of sites for future Mars missions in exobiologically important areas. On Earth, snow and ice are widespread, not only in extensive icecaps but also as alpine glaciers at high elevations in tropical regions. By contrast, Mars today is an arid volcanic planet with only small polar ice-caps although an abundance of water is believed to be trapped in the cryolithosphere. It is also thought that the planet may have sustained extensive frozen oceans early in its history. The presence of a former hydrosphere, a cryosphere and coincident volcanism thus make Mars the likeliest prospect for the first discoveries of life away from Earth. Much research has assumed that terrestrial volcano-ice systems are plausible analogues for putative Martian examples, but until mankind finally sets foot on Mars, there is no simple test for that assumption. Our hope is that the knowledge presented here will stimulate research among planetary geologists in this exciting, rapidly expanding field for many years to come.