Glacial geomorphology of Bonney drift, Taylorvalley, Antarctica
The aim of this paper is to document the response of the East Antarctic Ice Sheet (EAIS) near the Dry Valleys to the excess warmth of the last interglaciation by establishing the behavior of Taylor Glacier. The AA. present a model for the deposition
by Taylor Glacier of Bonney drift in central TaylorValley. Bonney drift is important because it records the penultimate advance of Taylor Glacier through central and lower TaylorValley.
Geochronology of Bonney drift, TaylorValley, Antarctica : evidence for interglacial expansions of Taylor glacier
This study focuses on glaciogenic sediments in TaylorValley, which features Taylor Glacier, an outlet of the peripheral Taylor Dome of the East Antarctic Ice Sheet (EAIS). Here, the AA. present the geochronology of Bonney drift.
Griffith Taylor's palimpsest theory of the Dry Valleys of Victoria Land, Antarctica
Griffith Taylor was the first geomorphologist to work in the Dry Valleys of southern Victoria Land, Antarctica. He proposed a multistage model in which earlier cirque erosion was later swamped by expanding outlet glaciers. Subsequently
these glaciers retreated leaving the present form of the valleys. The topography retained the imprint of each episode, hence his name palimpsest theory. The A. summarises later research and compares Taylor's theory with current views.
Limited pliocene glacier extent and surface uplift in middle TaylorValley, Antarctica
The purpose of this paper is to assess the degree of stability/instability of the East Antarctic Ice Sheet during the Pliocene by dating and mapping surficial deposits in middle TaylorValley in the Dry Valleys region of southern Victoria Land.
L'analyse isotopique et géochimique des dépôts carbonatés lacustres et deltaïques de la TaylorValley confirme que le Taylor Glacier a connu des avancées glaciaires durant chacun des trois derniers Interglaciaires, en réponse à un épaississement de
Radiocarbon chronology of Ross Sea drift, eastern TaylorValley, Antarctica : evidence for a grounded ice sheet in the Ross Sea at the Last Glacial Maximum
More than 250 radiocarbon dates of lacustrine algae and marine shells afford a chronology for Ross Sea drift in eastern TaylorValley. Four major drift sheets in eastern TaylorValley are differentiated. Evidence from ice-dammed lakes in Taylor
Valley and from shells from McMurdo Sound suggests grounding-line retreat from the vicinity of Ross island between 6500 and 8340 C 14 yr BP. Rising sea level may have triggered internal mechanisms within the ice sheet that led to retreat, but did
Soil processes and development rates in the Quartermain Mountains, Upper Taylor Glacier region, Antarctica
The aim of this paper is to compare and contrast soil-forming processes and soil develoment rates on glacial deposits in 2 adjacent and coeval valleys of the Quatermain Mountains : Beacon Valley and Arena Valley. More than 100 soil profiles were
examined on 7 drift sheets ranging from 115 000 to greater than 11.3 million years in age. Although the 2 valleys contain drifts of similar age, they differ markedly in ice content of the substrate. The following soil properties increase with age in both
valleys : weathering stage, morphogenetic salt stage, thickness of the salt pan, the quantity of profile salts, and depth of staining.
Observations from TaylorValley suggest that the wedging effect of sand particles, packed by powerful winds into cracks in rocks, may act as a weathering mechanism. Discussion.
Use of soil chronosequences for testing the existence of high-water-level lakes in the McMurdo Dry Valleys, Antarctica
The AA. utilize field observations and data collected from 190 pedons from Wright and TaylorValleys to search for evidence of high-water-level lakes proposed to have existed during the last Glacial Maximum and early Holocene in the McMurdo Dry
Valleys. The results cast doubt as to whether high-level lakes existed in the McMurdo Dry Valley as recently as the early Holocene. An alternative explanation is that the former lakes had no effects on soils other than depositing deltas with cyanobacteria
The overall results in this paper afford a background for interpreting the glacial chronology of eastern TaylorValley and for reconstructing a grounded ice sheet in the overall Ross Embayment at the Last Glacial Maximum (LGM)
Thermal characterisation of active layer across a soil moisture gradient in the McMurdo Dry Valleys, Antarctica
Antarctique ; Bilan énergétique ; Changement climatique ; Dry Valleys ; Humidité du sol ; Modèle numérique ; Mollisol ; Périglaciaire ; Température du sol
Here, the AA. present results of a study to characterise soil thermal properties along a soil moisture gradient adjacent to Lake Fryxell in TaylorValley, Antarctica. The goals were to characterise the thermal characteristics of these relatively wet
soils (compared to the rest of the McMurdo Dry Valleys landscape), and to assess the response of the active layer to possible increases in soil moisture. The AA. measured subsurfaces temperatures at depths from 3 to 50 cm at 4 locations along a natural
and interprets the ice marginal sediments and landforms of several glaciers in the Taylor and Wright valleys. The principal characteristics of the ice marginal landforms and sediments are compared and contrasted with the existing facies model for arid polar
The objective of this study was to determine whether the dry-based glaciers of the Dry Valleys of southern Victoria Land, Antarctica, form a land system and sediment association that is different from the other thermal types. This paper examines
The dispersal of metalliferous pollution from several spoil heaps produced during 20th century copper mining in the Gruben River valley,in the Namib Desert is examined. More specifically, this study examines the spatial and temporal patterns
of metal dispersal and storage and how these vary according to different sedimentary environments. Although the total metal concentrations in the Gruben River valley sediments are extremely high and are in themselves a concern, the small percentage
Entwicklungsprobleme des New Valley, Agyptische Sahara. (Development problems of the New Valley, Egyptian Sahara
(1967-1978) ; Colonisation agricole ; Egypte ; Géographie de l'Afrique ; New Valley Project ; New Valley, rég. ; Peuplement ; Politique agricole
Mise en oeuvre du projet de colonisation agricole et de peuplement de la New Valley, depuis le rapport fait par Schamp en 1967 plus particulièrement. (HSC).
In this issue, Korup et al. describe how rockslides in the Himalaya, Tien Shan, and New Zealand Southern Alps force channel alluviation and relocation, and inhibit fluvial incision into bedrock. Taylor and Kite develop a conceptual model postulating
that valley-width morphometry and style of hillslope delivery are the primary factors controlling the efficiency of sediment transport along mountain rivers in the central Appalachachians of USA. In the Italian Alps, Comiti et al. find that wood inputs result
The origin of certain wide valleys in the Canary Islands
Canary Islands ; Geomorphology ; Inverted relief ; Lava flow ; Model ; Valley ; Volcanism
The present work addresses a long-term controversy concerning the origin of Orotava Valley, one of the most peculiar valleys in the Island of Tenerife. Analysis of the key features of Orotava Valley leads to formulation of an hypothesis which could
be applicable to numerous volcanic areas. Such valleys are developed as volcanic valleys undergo lateral expansion due to repeated alternations of processes: initial erosion of the gorges by streams, the burial of the gorges by lava flows, and the inversion
of the relief by erosion at the base of valley walls.