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Detrital Zircon Geochronology of Palaeozoic Siliciclastic Rocks from the Ellsworth Mountains, West Antarctica
O EOL GIC G A D D A E D C E I H C I L E O S F u n 2 d 6 la serena octubre 2015 ada en 19 Detrital zircon geochronology of Palaeozoic siliciclastic rocks from the Ellsworth Mountains, West Antarctica Paula Castillo* and C. Mark Fanning Research School of Earth Sciences, The Australian National University, Canberra, Australia. Rodrigo Fernández University of Texas Institute for Geophysics, The University of Texas at Austin, Austin, Texas, USA. Fernando Poblete Geosciences Rennes, Université de Rennes 1, Rennes, France. Departamento de Geología, Universidad de Chile, Santiago, Chile. *Contact email: [email protected] Abstract. In the Ellsworth Mountains there is an extensive record of sedimentation from early Cambrian to Permian times. However, the tectonic history and the palaeogeographic significance remain enigmatic. Nine sandstone samples were analysed for their U-Pb detrital zircon age spectra using SHRIMPII and RG. They belong to the early Cambrian to Carboniferous-Permian sequences and record typical Gondwana margin signatures. Variations up section/sequence in zircon provenance suggest restricted basinal deposition during the Cambrian,! with likely sources in the Namaqua-Natal and Mozambique/Maud Belts. There are little or no contributions from older cratons and so the Ellsworth basin evolved as a separate basin to that in the Transantarctic Mountains.! This basin configuration changed after the Devonian and deposition continued Figure 1. Reconstruction of part of Gondwana at ca. 500 Ma. during the late Palaeozoic, when the Ellsworth Mountains South America: SFC - Sao Francisco craton; PPC - basin only received detritus from the Ross/Pan-African Paranapanema craton; RPC - Río de la Plata craton. -
Review of the Geology and Paleontology of the Ellsworth Mountains, Antarctica
U.S. Geological Survey and The National Academies; USGS OF-2007-1047, Short Research Paper 107; doi:10.3133/of2007-1047.srp107 Review of the geology and paleontology of the Ellsworth Mountains, Antarctica G.F. Webers¹ and J.F. Splettstoesser² ¹Department of Geology, Macalester College, St. Paul, MN 55108, USA ([email protected]) ²P.O. Box 515, Waconia, MN 55387, USA ([email protected]) Abstract The geology of the Ellsworth Mountains has become known in detail only within the past 40-45 years, and the wealth of paleontologic information within the past 25 years. The mountains are an anomaly, structurally speaking, occurring at right angles to the Transantarctic Mountains, implying a crustal plate rotation to reach the present location. Paleontologic affinities with other parts of Gondwanaland are evident, with nearly 150 fossil species ranging in age from Early Cambrian to Permian, with the majority from the Heritage Range. Trilobites and mollusks comprise most of the fauna discovered and identified, including many new genera and species. A Glossopteris flora of Permian age provides a comparison with other Gondwana floras of similar age. The quartzitic rocks that form much of the Sentinel Range have been sculpted by glacial erosion into spectacular alpine topography, resulting in eight of the highest peaks in Antarctica. Citation: Webers, G.F., and J.F. Splettstoesser (2007), Review of the geology and paleontology of the Ellsworth Mountains, Antarctica, in Antarctica: A Keystone in a Changing World – Online Proceedings of the 10th ISAES, edited by A.K. Cooper and C.R. Raymond et al., USGS Open- File Report 2007-1047, Short Research Paper 107, 5 p.; doi:10.3133/of2007-1047.srp107 Introduction The Ellsworth Mountains are located in West Antarctica (Figure 1) with dimensions of approximately 350 km long and 80 km wide. -
Rapid Cenozoic Glaciation of Antarctica Induced by Declining
letters to nature 17. Huang, Y. et al. Logic gates and computation from assembled nanowire building blocks. Science 294, Early Cretaceous6, yet is thought to have remained mostly ice-free, 1313–1317 (2001). 18. Chen, C.-L. Elements of Optoelectronics and Fiber Optics (Irwin, Chicago, 1996). vegetated, and with mean annual temperatures well above freezing 4,7 19. Wang, J., Gudiksen, M. S., Duan, X., Cui, Y. & Lieber, C. M. Highly polarized photoluminescence and until the Eocene/Oligocene boundary . Evidence for cooling and polarization sensitive photodetectors from single indium phosphide nanowires. Science 293, the sudden growth of an East Antarctic Ice Sheet (EAIS) comes 1455–1457 (2001). from marine records (refs 1–3), in which the gradual cooling from 20. Bagnall, D. M., Ullrich, B., Sakai, H. & Segawa, Y. Micro-cavity lasing of optically excited CdS thin films at room temperature. J. Cryst. Growth. 214/215, 1015–1018 (2000). the presumably ice-free warmth of the Early Tertiary to the cold 21. Bagnell, D. M., Ullrich, B., Qiu, X. G., Segawa, Y. & Sakai, H. Microcavity lasing of optically excited ‘icehouse’ of the Late Cenozoic is punctuated by a sudden .1.0‰ cadmium sulphide thin films at room temperature. Opt. Lett. 24, 1278–1280 (1999). rise in benthic d18O values at ,34 million years (Myr). More direct 22. Huang, Y., Duan, X., Cui, Y. & Lieber, C. M. GaN nanowire nanodevices. Nano Lett. 2, 101–104 (2002). evidence of cooling and glaciation near the Eocene/Oligocene 8 23. Gudiksen, G. S., Lauhon, L. J., Wang, J., Smith, D. & Lieber, C. M. Growth of nanowire superlattice boundary is provided by drilling on the East Antarctic margin , structures for nanoscale photonics and electronics. -
Reconstructions of Antarctic Topography Since the Eocene–Oligocene T Boundary ⁎ Guy J.G
Palaeogeography, Palaeoclimatology, Palaeoecology 535 (2019) 109346 Contents lists available at ScienceDirect Palaeogeography, Palaeoclimatology, Palaeoecology journal homepage: www.elsevier.com/locate/palaeo Reconstructions of Antarctic topography since the Eocene–Oligocene T boundary ⁎ Guy J.G. Paxmana, , Stewart S.R. Jamiesona, Katharina Hochmuthb,c, Karsten Gohlb, Michael J. Bentleya, German Leitchenkovd,e, Fausto Ferracciolif a Department of Geography, Durham University, Durham, UK b Alfred Wegener Institute Helmholtz-Center for Polar and Marine Sciences, Bremerhaven, Germany c School of Geography, Geology and the Environment, University of Leicester, Leicester, UK d Institute for Geology and Mineral Resources of the World Ocean, St. Petersburg, Russia e Institute of Earth Sciences, St. Petersburg State University, St. Petersburg, Russia f British Antarctic Survey, Cambridge, UK ABSTRACT Accurate models of past Antarctic ice sheet behaviour require realistic reconstructions of the evolution of bedrock topography. However, other than a preliminary attempt to reconstruct Antarctic topography at the Eocene–Oligocene boundary, the long-term evolution of Antarctica's subglacial topography throughout its glacial history has not previously been quantified. Here, we derive new reconstructions of Antarctic topography for four key time slices in Antarctica's climate andglacial history: the Eocene–Oligocene boundary (ca. 34 Ma), the Oligocene–Miocene boundary (ca. 23 Ma), the mid-Miocene climate transition (ca. 14 Ma), and the mid- Pliocene warm period (ca. 3.5 Ma). To reconstruct past topography, we consider a series of processes including ice sheet loading, volcanism, thermal subsidence, horizontal plate motion, erosion, sedimentation and flexural isostatic adjustment, and validate our models where possible using onshore and offshore geological constraints. Our reconstructions show that the land area of Antarctica situated above sea level was ~25% larger at the Eocene–Oligocene boundary than at the present-day. -
Data Structure
Data structure – Water The aim of this document is to provide a short and clear description of parameters (data items) that are to be reported in the data collection forms of the Global Monitoring Plan (GMP) data collection campaigns 2013–2014. The data itself should be reported by means of MS Excel sheets as suggested in the document UNEP/POPS/COP.6/INF/31, chapter 2.3, p. 22. Aggregated data can also be reported via on-line forms available in the GMP data warehouse (GMP DWH). Structure of the database and associated code lists are based on following documents, recommendations and expert opinions as adopted by the Stockholm Convention COP6 in 2013: · Guidance on the Global Monitoring Plan for Persistent Organic Pollutants UNEP/POPS/COP.6/INF/31 (version January 2013) · Conclusions of the Meeting of the Global Coordination Group and Regional Organization Groups for the Global Monitoring Plan for POPs, held in Geneva, 10–12 October 2012 · Conclusions of the Meeting of the expert group on data handling under the global monitoring plan for persistent organic pollutants, held in Brno, Czech Republic, 13-15 June 2012 The individual reported data component is inserted as: · free text or number (e.g. Site name, Monitoring programme, Value) · a defined item selected from a particular code list (e.g., Country, Chemical – group, Sampling). All code lists (i.e., allowed values for individual parameters) are enclosed in this document, either in a particular section (e.g., Region, Method) or listed separately in the annexes below (Country, Chemical – group, Parameter) for your reference. -
Mount Harding, Grove Mountains, East Antarctica
MEASURE 2 - ANNEX Management Plan for Antarctic Specially Protected Area No 168 MOUNT HARDING, GROVE MOUNTAINS, EAST ANTARCTICA 1. Introduction The Grove Mountains (72o20’-73o10’S, 73o50’-75o40’E) are located approximately 400km inland (south) of the Larsemann Hills in Princess Elizabeth Land, East Antarctica, on the eastern bank of the Lambert Rift(Map A). Mount Harding (72°512 -72°572 S, 74°532 -75°122 E) is the largest mount around Grove Mountains region, and located in the core area of the Grove Mountains that presents a ridge-valley physiognomies consisting of nunataks, trending NNE-SSW and is 200m above the surface of blue ice (Map B). The primary reason for designation of the Area as an Antarctic Specially Protected Area is to protect the unique geomorphological features of the area for scientific research on the evolutionary history of East Antarctic Ice Sheet (EAIS), while widening the category in the Antarctic protected areas system. Research on the evolutionary history of EAIS plays an important role in reconstructing the past climatic evolution in global scale. Up to now, a key constraint on the understanding of the EAIS behaviour remains the lack of direct evidence of ice sheet surface levels for constraining ice sheet models during known glacial maxima and minima in the post-14 Ma period. The remains of the fluctuation of ice sheet surface preserved around Mount Harding, will most probably provide the precious direct evidences for reconstructing the EAIS behaviour. There are glacial erosion and wind-erosion physiognomies which are rare in nature and extremely vulnerable, such as the ice-core pyramid, the ventifact, etc. -
GSA TODAY • Southeastern Section Meeting, P
Vol. 5, No. 1 January 1995 INSIDE • 1995 GeoVentures, p. 4 • Environmental Education, p. 9 GSA TODAY • Southeastern Section Meeting, p. 15 A Publication of the Geological Society of America • North-Central–South-Central Section Meeting, p. 18 Stability or Instability of Antarctic Ice Sheets During Warm Climates of the Pliocene? James P. Kennett Marine Science Institute and Department of Geological Sciences, University of California Santa Barbara, CA 93106 David A. Hodell Department of Geology, University of Florida, Gainesville, FL 32611 ABSTRACT to the south from warmer, less nutrient- rich Subantarctic surface water. Up- During the Pliocene between welling of deep water in the circum- ~5 and 3 Ma, polar ice sheets were Antarctic links the mean chemical restricted to Antarctica, and climate composition of ocean deep water with was at times significantly warmer the atmosphere through gas exchange than now. Debate on whether the (Toggweiler and Sarmiento, 1985). Antarctic ice sheets and climate sys- The evolution of the Antarctic cryo- tem withstood this warmth with sphere-ocean system has profoundly relatively little change (stability influenced global climate, sea-level his- hypothesis) or whether much of the tory, Earth’s heat budget, atmospheric ice sheet disappeared (deglaciation composition and circulation, thermo- hypothesis) is ongoing. Paleoclimatic haline circulation, and the develop- data from high-latitude deep-sea sed- ment of Antarctic biota. iments strongly support the stability Given current concern about possi- hypothesis. Oxygen isotopic data ble global greenhouse warming, under- indicate that average sea-surface standing the history of the Antarctic temperatures in the Southern Ocean ocean-cryosphere system is important could not have increased by more for assessing future response of the Figure 1. -
Antarctic Primer
Antarctic Primer By Nigel Sitwell, Tom Ritchie & Gary Miller By Nigel Sitwell, Tom Ritchie & Gary Miller Designed by: Olivia Young, Aurora Expeditions October 2018 Cover image © I.Tortosa Morgan Suite 12, Level 2 35 Buckingham Street Surry Hills, Sydney NSW 2010, Australia To anyone who goes to the Antarctic, there is a tremendous appeal, an unparalleled combination of grandeur, beauty, vastness, loneliness, and malevolence —all of which sound terribly melodramatic — but which truly convey the actual feeling of Antarctica. Where else in the world are all of these descriptions really true? —Captain T.L.M. Sunter, ‘The Antarctic Century Newsletter ANTARCTIC PRIMER 2018 | 3 CONTENTS I. CONSERVING ANTARCTICA Guidance for Visitors to the Antarctic Antarctica’s Historic Heritage South Georgia Biosecurity II. THE PHYSICAL ENVIRONMENT Antarctica The Southern Ocean The Continent Climate Atmospheric Phenomena The Ozone Hole Climate Change Sea Ice The Antarctic Ice Cap Icebergs A Short Glossary of Ice Terms III. THE BIOLOGICAL ENVIRONMENT Life in Antarctica Adapting to the Cold The Kingdom of Krill IV. THE WILDLIFE Antarctic Squids Antarctic Fishes Antarctic Birds Antarctic Seals Antarctic Whales 4 AURORA EXPEDITIONS | Pioneering expedition travel to the heart of nature. CONTENTS V. EXPLORERS AND SCIENTISTS The Exploration of Antarctica The Antarctic Treaty VI. PLACES YOU MAY VISIT South Shetland Islands Antarctic Peninsula Weddell Sea South Orkney Islands South Georgia The Falkland Islands South Sandwich Islands The Historic Ross Sea Sector Commonwealth Bay VII. FURTHER READING VIII. WILDLIFE CHECKLISTS ANTARCTIC PRIMER 2018 | 5 Adélie penguins in the Antarctic Peninsula I. CONSERVING ANTARCTICA Antarctica is the largest wilderness area on earth, a place that must be preserved in its present, virtually pristine state. -
Open-File Report 2007-1047, Extended Abstracts
U.S. Geological Survey Open-File Report 2007-1047 Antarctica: A Keystone in a Changing World—Online Proceedings for the 10th International Symposium on Antarctic Earth Sciences Santa Barbara, California, U.S.A.—August 26 to September 1, 2007 Edited by Alan Cooper, Carol Raymond, and the 10th ISAES Editorial Team 2007 Extended Abstracts Extended Abstract 001 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea001.pdf Ross Aged Ductile Shearing in the Granitic Rocks of the Wilson Terrane, Deep Freeze Range area, north Victoria Land (Antarctica) by Federico Rossetti, Gianluca Vignaroli, Fabrizio Balsamo, and Thomas Theye Extended Abstract 002 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea002.pdf Postcollisional Magmatism of the Ross Orogeny (Victoria Land, Antarctica): a Granite- Lamprophyre Genetic Link S. Rocchi, G. Di Vincenzo, C. Ghezzo, and I. Nardini Extended Abstract 003 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea003.pdf Age of Boron- and Phosphorus-Rich Paragneisses and Associated Orthogneisses, Larsemann Hills: New Constraints from SHRIMP U-Pb Zircon Geochronology by C. J. Carson, E.S. Grew, S.D. Boger, C.M. Fanning and A.G. Christy Extended Abstract 004 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea004.pdf Terrane Correlation between Antarctica, Mozambique and Sri Lanka: Comparisons of Geochronology, Lithology, Structure And Metamorphism G.H. Grantham, P.H. Macey, B.A. Ingram, M.P. Roberts, R.A. Armstrong, T. Hokada, K. by Shiraishi, A. Bisnath, and V. Manhica Extended Abstract 005 http://pubs.usgs.gov/of/2007/1047/ea/of2007-1047ea005.pdf New Approaches and Progress in the Use of Polar Marine Diatoms in Reconstructing Sea Ice Distribution by A. -
Ice Caves of Terra Nova Bay (Victoria Land, Antarctica)
SPECIALE GLACIER CAVES NIMBUS 23-24 Ice Caves of Terra Nova Bay (Victoria Land, Antarctica) Mirco Meneghel - Dipartimento di Geografia, University of Padova, Italy Giovanni Badino - Dipartimento di Fisica Generale, University of Torino, Italy Associazione La Venta Abstract Baia Terra Nova, sulla costa occi- wider Terra Nova Bay, on the we- In the 2000/2001 expedition of dentale del Mare di Ross. Sono stern coast of the Ross Sea, at 74° the Italian Programme of Resear- state esplorate tre grotte nella 41' 42" S lat. and 164° 07' 23" E ch in Antarctica (PNRA) an inve- fronte dei ghiacciai al contatto col long. The Transantarctic Mts, stigation on the presence of ca- mare e un'altra sulla sommità del whose relief is often higher than ves in ice has been carried out monte Melbourne, un cono vulca- 3000 m, fringe the coast. South near the Italian Station of Terra nico di 2700 metri di altezza. Le of the Base the mountain chaine Nova Bay, on the western coast of grotte sulla costa sono crepacci is crossed by outlet glaciers that the Ross Sea (Northern Victoria ampliati dalla sublimazione del drain the ice of the inlandsis. On Land). Three caves have been ex- ghiaccio a causa della differenza the north huge valley glaciers plored at the snout of glaciers di temperatura fra il ghiaccio e flow from the mountains to the reaching the sea and an other l'acqua marina. La grotta subgla- sea. The Italian Base is placed one on the summit of Mt Mel- ciale sul monte Melbourne è ge- between the region of the Dry bourne, a volcanic cone 2700 m nerata dal calore delle rocce vul- Valleys to the south, where broad 1 - Below - high. -
B. Antarctic Geologic Reports and Maps
I Ti). W LU. I- LU GLACIER SURFACE 500 7 - w E I Z .\c&A G /GLACIER 14/Lso,v 100 BOTTOM - SEA LEVEL --- GL.. -I ] —100 rs rA 5) -- 10 KM 1 B. Figure 1. Radio-echo sounding profiles extending (A) southward from McMurdo Sound through the Wilson Piedmont and Victoria Lower Glaciers to lower Victoria Valley, and (B) northeastward from lower Wright Valley through Wright Lower and Wilson Piedmont Glaciers to McMurdo Sound. Dashed lines representing snouts of valley glaciers are projections from maps or from other radio-echo data. Some small irregularities in glacier surfaces are caused by errors in pressure record of flight recorder. Figure 2. Radio-echo sounding profile westward from McMurdo Sound through lower Ferrar and upper Taylor Glaciers to 155°E. longitude, on Victoria Land plateau. EAST WEST ICE SHEET 145 ibco 1 500 200 SEA LEVEL--, -400 HIS SEEM " -200 KM ncrth—south faults bounding the eastern side of the Antarctic geologic reports and maps mountains may be indicated by steep breaks in slope occurring in the bottom trace of the profiles transect- CAMPBELL CRADDOCK in the Wilson Piedmont area (figs. 1A and 1B). Department of Geology and Geophysics Work described in this paper was undertaken at the University of Wisconsin, Madison Scott Polar Research Institute, Cambridge, England. Work has continued this year on bringing to publi- References cation the results of eight seasons of geologic study in Ca kin, P. E. In press. Glacial geology of the Victoria Valley parts of West Antarctica. Recent effort has focused on system, southern Victoria Land, Antarctica. -
The Eighth Continent?
www.Breaking News English.com Ready-to-Use English Lessons by Sean Banville “1,000 IDEAS & ACTIVITIES Thousands more free lessons FOR LANGUAGE TEACHERS” from Sean's other websites www.breakingnewsenglish.com/book.html www.freeeslmaterials.com/sean_banville_lessons.html Level 2 Zealandia – The eighth continent? 19th February, 2017 http://www.breakingnewsenglish.com/1702/170219-zealandia-2.html Contents The Reading 2 Phrase Matching 3 Listening Gap Fill 4 No Spaces 5 Survey 6 Writing and Speaking 7 Writing 8 Please try Levels 0, 1 and 3. They are (a little) harder. Twitter twitter.com/SeanBanville Facebook www.facebook.com/pages/BreakingNewsEnglish/155625444452176 Google + https://plus.google.com/+SeanBanville THE READING From http://www.breakingnewsenglish.com/1702/170219-zealandia-2.html We used to believe there were nine planets, but now there are eight (Pluto is not a planet). Now we may have to change how many continents there are. We are taught there are seven - Asia, Africa, North and South America, Antarctica, Europe, and Australia. Geologists now say there is an eighth continent - Zealandia. This is a big, largely underwater landmass in the Pacific Ocean. Six per cent of it is above water and is New Zealand and New Caledonia. The rest is under the ocean. It is five million square kilometres, which scientists say is big enough to be a continent. Geologists explained why Zealandia is a continent in a research paper in the Geological Society of America's Journal. They argue that the land does not have to be above water to be a continent. They said Zealandia is a continent because of four points: It is a lot higher than the area around it, it has a special geology, it is easy to see its shape, and it is thicker than the ocean floor.