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Articles 1 - 10 of 10
Full-Text Articles in Physical Sciences and Mathematics
Deglacial Radiocarbon Chronology Of The Western Ross Sea From Relative Sea-Level Curves, George H. Denton, Brenda Hall
Deglacial Radiocarbon Chronology Of The Western Ross Sea From Relative Sea-Level Curves, George H. Denton, Brenda Hall
University of Maine Office of Research Administration: Grant Reports
This award provides support for one year of funding to perform carbon-14 analyses on samples (seal skin and Adamussium colbecki shells) collected in firm stratigraphic position within numerous raised beaches along the Scott Coast of the western Ross Sea, Antarctica. These measurements will enable the development of a radiocarbon chronology and will result in detailed relative sea- level curves for five separate localities along the Scott Coast. These relative sea-level curves will help to constrain the timing of deglaciation in the western Ross Sea. During the last glaciation, West Antarctic ice expanded into the Ross Sea, merged with East Antarctic …
Soluble Species In Aerosol And Snow And Their Relationship At Glacier 1, Tien Shan, China, Junying Sun, Dahe Qin, Paul Andrew Mayewski, Jack E. Dibb, Sallie Whitlow, Zhongqin Li, Qinzhao Yang
Soluble Species In Aerosol And Snow And Their Relationship At Glacier 1, Tien Shan, China, Junying Sun, Dahe Qin, Paul Andrew Mayewski, Jack E. Dibb, Sallie Whitlow, Zhongqin Li, Qinzhao Yang
Earth Science Faculty Scholarship
Simultaneous sampling of aerosol (n = 20) and snow (n = 114) was made at Glacier 1, Tien Shan, between May 19 and June 29, 1996. Similar temporal patterns of some major ion (calcium, magnesium, potassium, sodium, chloride, and sulfate) concentrations between snow and aerosol show that snow chemistry basically reflects changes in the chemistry of the atmosphere. This gives us confidence in the reconstruction of past atmospheric change using some snow data. There are no significant correlations between aerosol and snow samples for ammonium and nitrate. This suggests that postdepositional and/or postcollection processes may alter ammonium and …
Antarctic Glacial History Since The Last Glacial Maximum: An Overview Of The Record On Land, Ólafur Ingólfsson, Christian Hjort, Paul A. Berkman, Svante Björck, Eric Colhoun, Ian D. Goodwin, Brenda Hall, Kazuomi Hirakawa, Martin Melles, Per Möller, Michael L. Prentice
Antarctic Glacial History Since The Last Glacial Maximum: An Overview Of The Record On Land, Ólafur Ingólfsson, Christian Hjort, Paul A. Berkman, Svante Björck, Eric Colhoun, Ian D. Goodwin, Brenda Hall, Kazuomi Hirakawa, Martin Melles, Per Möller, Michael L. Prentice
Earth Science Faculty Scholarship
This overview examines available circum-Antarctic glacial history archives on land, related to developments after the Last Glacial Maximum (LGM). It considers the glacial-stratigraphic and morphologic records and also biostratigraphical information from moss banks, lake sediments and penguin rookeries, with some reference to relevant glacial marine records. It is concluded that Holocene environmental development in Antarctica differed from that in the Northern Hemisphere. The initial deglaciation of the shelf areas surrounding Antarctica took place before 10000 C-14 yrs before present(sp), and was controlled by rising global sea level. This was followed by the deglaciation of some presently ice-free inner shelf and …
Circum-Antarctic Coastal Environmental Shifts During The Late Quaternary Reflected By Emerged Marine Deposits, Paul A. Berkman, John T. Andrews, Svante Björck, Eric A. Colhoun, Steven D. Emslie, Ian D. Goodwin, Brenda L. Hall, Charles P. Hart, Kazuomi Hirakawa, Atsuo Igarashi, Olafur Ingólffson, Jeronimo Lopez-Martinez, W. Berry Lyons, Mark C.G. Mabin, Patrick G. Quilty, Marco Taviani, Yoshio Yoshida
Circum-Antarctic Coastal Environmental Shifts During The Late Quaternary Reflected By Emerged Marine Deposits, Paul A. Berkman, John T. Andrews, Svante Björck, Eric A. Colhoun, Steven D. Emslie, Ian D. Goodwin, Brenda L. Hall, Charles P. Hart, Kazuomi Hirakawa, Atsuo Igarashi, Olafur Ingólffson, Jeronimo Lopez-Martinez, W. Berry Lyons, Mark C.G. Mabin, Patrick G. Quilty, Marco Taviani, Yoshio Yoshida
Earth Science Faculty Scholarship
This review assesses the circumpolar occurrence of emerged marine macrofossils and sediments from Antarctic coastal areas in relation to Late Quaternary climate changes. Radiocarbon ages of the macrofossils, which are interpreted in view of the complexities of the Antarctic marine radiocarbon reservoir and resolution of this dating technique, show a bimodal distribution. The data indicate that marine species inhabited coastal environments from at least 35000 to 20000 yr sp, during Marine Isotope Stage 3 when extensive iceberg calving created a 'meltwater lid' over the Southern Ocean. The general absence of these marine species from 20000 to 8500 yr sp coincides …
Tb169: Chemical And Physical Properties Of The Mapleton, Monson, Saddelback, And Sisk Soil Map Units, Robert V. Rourke
Tb169: Chemical And Physical Properties Of The Mapleton, Monson, Saddelback, And Sisk Soil Map Units, Robert V. Rourke
Technical Bulletins
Mapleton, Monson, Saddleback, and Sisk soil map units were each sampled at five locations. Soil descriptions and locations were documented in the field. Soil samples were removed from each horizon in a 30-cm square to a 100-cm depth or to bedrock whichever came first. Laboratory analyses of each soil horizon sampled included texture, volume of stones, organic content, bulk density, soil water retention, soil reaction, exchangeable cations, extractable acidity, and exchange acidity. Soil descriptions and tables of soil properties were constructed for each sample site. Soil data for each soil map unit was summarized by horizon using weighted means.
Hyalotekite, (Ba,Pb,K)(4)(Ca,Y)(2)Si-8(B,Be)(2)(Si,B)(2)O28f, A Tectosilicate Related To Scapolite: New Structure Refinement, Phase Transitions And A Short-Range Ordered 3b Superstructure, A. G. Christy, Edward S. Grew, S. C. Mayo, Martin G. Yates, Dimitriy I. Belakovskiy
Hyalotekite, (Ba,Pb,K)(4)(Ca,Y)(2)Si-8(B,Be)(2)(Si,B)(2)O28f, A Tectosilicate Related To Scapolite: New Structure Refinement, Phase Transitions And A Short-Range Ordered 3b Superstructure, A. G. Christy, Edward S. Grew, S. C. Mayo, Martin G. Yates, Dimitriy I. Belakovskiy
Earth Science Faculty Scholarship
Hyalotekite, a framework silicate of composition (Ba,Pb,K)(4)(Ca,Y)(2)Si-8(B,Be)(2) (Si,B)(2)O28F, is found in relatively high-temperature(greater than or equal to 500 degrees C) Mn skarns at Langban, Sweden, and peralkaline pegmatites at Dara-i-Pioz, Tajikistan. A new paragenesis at Dara-i-Pioz is pegmatite consisting of the Ba borosilicates leucosphenite and tienshanite, as well as caesium kupletskite, aegirine, pyrochlore, microcline and quartz. Hyalotekite has been partially replaced by barylite and danburite. This hyalotekite contains 1.29-1.78 wt.% Y2O3, equivalent to 0.172-0.238 Y pfu or 8-11% Y on the Ca site; its Pb/(Pb+Ba) ratio ranges 0.36-0.44. Electron microprobe F contents of Langban and Dara-i-Pioz hyalotekite range 1.04-1.45 wt.%, …
Thermochronological Evidence For Late Proterozoic (Vendian) Cooling In Southwest Wedel Jarlsberg Land, Spitsbergen, M. Manecki, D. K. Holm, J. Czerny, Daniel R. Lux
Thermochronological Evidence For Late Proterozoic (Vendian) Cooling In Southwest Wedel Jarlsberg Land, Spitsbergen, M. Manecki, D. K. Holm, J. Czerny, Daniel R. Lux
Earth Science Faculty Scholarship
Two Proterozoic terranes with different metamorphic histories are distinguished from geological mapping in southwestern Wedel Jarlsberg Land: a northern greenschist facies terrane and a southern amphibolite facies terrane which has been overprinted by greenschist facies metamorphism. To better characterize the tectonothermal history of these terranes we have obtained new Ar-40/Ar-39 mineral dates from this area. A muscovite separate from the northern terrane yielded a Caledonian plateau age of 432 +/- 7 Ma. The southern terrane yielded significantly older Ar-40/Ar-39 ages with three muscovite plateau dates of 584 +/- 14 Ma, 575 +/- 15 Ma, and 459 +/- 9 Ma, a …
Limited Migration Of Soluble Ionic Species In A Siple Dome, Antarctica, Ice Core, Karl J. Kreutz, Paul Andrew Mayewski, Sallie I. Whitlow, Mark S. Twickler
Limited Migration Of Soluble Ionic Species In A Siple Dome, Antarctica, Ice Core, Karl J. Kreutz, Paul Andrew Mayewski, Sallie I. Whitlow, Mark S. Twickler
Earth Science Faculty Scholarship
High-resolution (>10 samples a -1) glaciochemical analyses covering the last 110 years from a Siple Dome, Antarctica, ice core reveal limited migration of certain soluble ionic species (methane sulfonic acid, NO3 and Mg2+). Th e observed chemical migration m ay be due in part to seasonal alternation between less acidic winter (from high sea-salt concentrations) and m ore acidic summer (from high marine biogenic acid concentrations) layers, common at coastal sites such as Siple Dome. Exact mechanisms to explain the migration are unclear, although simple diffusion and gravitational movement are unlikely since new peaks are …
Spatial Variability Of Snow Chemistry In Western Dronning Maud Land, Antarctica, Malin Stenberg, Elisabeth Isaksson, Margareta Hansson, Wibjörn Karlén, Paul Andrew Mayewski, Mark S. Twickler, Sallie I. Whitlow, Niels Gundestrup
Spatial Variability Of Snow Chemistry In Western Dronning Maud Land, Antarctica, Malin Stenberg, Elisabeth Isaksson, Margareta Hansson, Wibjörn Karlén, Paul Andrew Mayewski, Mark S. Twickler, Sallie I. Whitlow, Niels Gundestrup
Earth Science Faculty Scholarship
During the austral summer of 1993-94 a number of 1-2 m deep snow pits were sampled in connection with firn-coring in western Dronning Maud Land, Antarctica. The traverse went from 800 to about 3000 m a.s.l. upon the high-altitude plateau. Profiles of cations (Na+, K+, Mg2+, Ca2+), anions (CI-, NO3-, SO42-, CH3SO3-) and stable oxygen isotopes (δ18O) from II snow pits are presented here. Close to the coast 2 m of snow accumulates in about 2-3 years, whilst …
Discussion Of: Lisa E. Wells, 1996. The Santa Beach Ridge Complex, Journal Of Coastal Research, 12(1), 1-17, Daniel H. Sandweiss, Kirk A. Maasch, Daniel F. Belknap, J. B. Richardson Iii, H. B. Rollins
Discussion Of: Lisa E. Wells, 1996. The Santa Beach Ridge Complex, Journal Of Coastal Research, 12(1), 1-17, Daniel H. Sandweiss, Kirk A. Maasch, Daniel F. Belknap, J. B. Richardson Iii, H. B. Rollins
Anthropology Faculty Scholarship
No abstract provided.