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Now showing items 112-131 of 201

Lake sediments record sensitivity of two hydrologically closed upland lakes in Mexico to human impact

Davies, Sarah J.; Metcalfe, S. E.; Chacon, A.; Bernal-Brooks, F.; Farmer, John G; MacKenzie, Angus B; Newton, Anthony J (2005-08)

We provide evidence of rapid, recent environmental change in two lakes in the highlands of central Mexico. Multiple sediment cores were obtained from Lago de Zirahuén (Michoacán) and Laguna de Juanacatlán (Jalisco). Analysis ...
Late-Holocene (post-4000 years BP) coastal dune development in Northumberland, northeast England

Braley, S. M.; Wintle, Ann G.; Wilson, P.; Orford, J. D.; Knight, J. (2011-07-29)

The recent environmental history of coastal dune systems in Northumberland, northeast England, has been examined using geomorphological, stratigraphical and sedimentological techniques linked to radiocarbon and infrared-stimulated ...
Late pleistocene and holocene vegetation history of the Bale mountains, Ethiopia

Lezine, A. -. M.; Umer, M.; Bonnefille, R.; Lamb, Henry F. (2007-09)

A sediment core recovered from Garba Guracha, a glacial lake at 3950 m altitude in the Bale Mountains of Ethiopia, at the boundary of the Ericaceous and Afroalpine vegetation belts, provides a 16,700-year pollen record of ...
Late Pleistocene desiccation of Lake Tana, source of the Blue Nile

Lamb, Henry F.; Bates, C. Richard; Marshall, Michael H.; Coombes, P. (Elsevier, 2007-02)

High-resolution seismic data from Lake Tana, the source of the Blue Nile in northern Ethiopia, reveal a deep sedimentary sequence divided by four strong reflectors. Data from nearshore cores show that the uppermost strong ...
Late Pleistocene desiccation of Lake Tana, source of the Blue Nile

Lamb, Henry F.; Bates, C. Richard; Coombes, Paul V.; Marshall, Michael H.; Umer, Mohammed; Davies, Sarah J.; Dejen, Eshete (2007-02-01)

High-resolution seismic data from Lake Tana, the source of the Blue Nile in northern Ethiopia, reveal a deep sedimentary sequence divided by four strong reflectors. Data from nearshore cores show that the uppermost strong ...
Late Quaternary dynamics of a South African floodplain wetland and the implications for assessing recent human impacts

Tooth, S.; Rodnight, H.; McCarthy, T. S.; Duller, G. A. T.; Grundling, A. (2009-05-15)

Knowledge of the long-term geomorphological dynamics of wetlands is limited, so currently there is an inadequate scientific basis for assessing anthropogenically induced changes and for developing conservation, remediation, ...
Late Quaternary floods and droughts in the Nile valley, Sudan: new evidence from optically stimulated luminescence and AMS radiocarbon dating

Williams, M. A. J.; Williams, F. M.; Duller, G. A. T.; Munro, R. N.; El Tom, O. A. M.; Barrows, T. T.; Macklin, M.; Woodward, J.; Talbot, M. R.; Haberlah, D.; Fluin, J. (2010-05)

Our results show that the late Pleistocene Nile in northern Sudan was shifting position and actively aggrading at 145 +/- 20 kyr, 83 +/- 24 kyr, 32 +/- 8 kyr and 20.7 +/- 0.2 kyr and indicate, for the first time, a phase ...
LM-OSL from single grains of quartz: a preliminary study

Bulur, E; Duller, GAT; Solongo, S; Bøtter-Jensen, L; Murray, AS (2002-01)

The recently developed single grain attachment for the Riso TL-OSL reader has been modified to achieve linearly modulated optically stimulated luminescence (LM-OSL). Three different types of luminescence behaviour were ...
The local and global dimensions of metalliferous pollution derived from a reconstruction of an eight thousand year record of copper smelting and mining at a desert-mountain frontier in southern Jordan

Hunt, Chris; Grattan, John; Gilbertson, D. (2007-01)

This paper establishes an eight thousand year history of anthropogenic metal pollution at one of the oldest, most important and longest sustained sites of the extraction and smelting of copper ores in the Old World: the ...
Long and short-term change in the Patzcuaro Basin, central Mexico

Metcalfe, S. E.; Davies, Sarah J.; Braisby, J.; Leng, Melanie J.; Newton, Anthony J; Terrett, Nicola L; O'Hara, Sarah L (2007-04-30)

Data are presented from four new cores from the Pátzcuaro basin in the volcanic highlands of central Mexico, which provide new insights into climate change and human impact over the last 23,000 cal. yr (19,000 14C yr) BP. ...
Long-term resilience, bush encroachment patterns and local knowledge in a Northeast African savanna

Gil-Romera, Graciela; Lamb, Henry F.; Umer, Mohammed; Sevilla-Callejo, Miguel; Turton, David (2010-10)

Bush encroachment is a significant phenomenon in savanna environments as it affects wildlife and local livelihoods by preventing new pasture generation. In this article we present a 2000-year record of vegetation change ...
Luminescence characteristics of quartz from the Southern Kenyan Rift Valley: Dose estimation using LM-OSL SAR

Cheong, C. S.; Wintle, Ann G.; Choi, J. H.; Duller, Geoff A. T. (2006)

Linearly modulated (LM) optically stimulated luminescence (OSL) measurements have revealed that some sedimentary quartz samples from the Kenyan Rift Valley do not have a fast OSL component, but contain a medium component ...
Luminescence dating of Quaternary sediments: recent advances

Duller, Geoff A. T. (2004-02)

Luminescence dating is unique amongst geochronological methods in dating the deposition of sediments based upon the properties of the constituent minerals. For Quaternary sediments the event being dated is the last exposure ...
Major- and trace-element characterization, expanded distribution, and a new chronology for the latest Pleistocene Glacier Peak tephras in western North America

Kuehn, Stephen C.; Froese, Duane G.; Carrara, Paul E.; Foit Jr, Franklin F.; Pearce, Nicholas J. G.; Rotheisler, Peter (2009)

The Glacier Peak tephra beds are among the most widespread and arguably some of the most important late Pleistocene chronostratigraphic markers in western North America. These beds represent a series of closely-spaced ...
Managing uncertainty when aggregating from pixels to objects: habitats, context-sensitive mapping and possibility theory

Comber, Alexis; Medcalf, Katie; Lucas, R. M.; Bunting, P.; Brown, Alan; Clewley, D.; Breyer, J.; Keyworth, Steve (2010-02-24)

Object-oriented remote sensing software provides the user with flexibility in the way that remotely sensed data are classified through segmentation routines and user-specified fuzzy rules. This paper explores the classification ...
Mantle heterogeneity beneath the southern Mid-Atlantic Ridge: trace element evidence for contamination of ambient asthenospheric mantle

le Roex, A. P.; Schilling, J. G.; le Roux, P. J.; Perkins, W. W.; Schimizu, N.; Pearce, Nicholas J. G. (2011-10-06)

We report new trace element data for an extensive suite of quench basalt glasses dredged from the southern Mid-Atlantic Ridge (MAR) between 40degreesS and 52.5degreesS. Ratios between highly incompatible trace elements are ...
The mechanism of thermally transferred optically stimulated luminescence in quartz

Wang, X. L.; Bailey, R. M.; Adamiec, G.; Wintle, Ann G. (2008-06-12)

In this paper we assess two mechanisms for the production of the thermally transferred optically stimulated luminescence (TT-OSL) signal in quartz when all stimulation is carried out at 125 °C. One mechanism is based on ...
Microwave scattering from mixed-species forests, Queensland, Australia

Lucas, Richard M.; Moghaddam, M.; Cronin, N. (2004-10)

The potential of synthetic aperture radar (SAR) data for retrieving the above-ground and component (e.g., branch, trunk) biomass of mixed-species forests (including woodlands) typical to subtropical Queensland, Australia, ...
Mid-Pleistocene silicic tephra beds in the Auckland region, New Zealand : their correlation and origins based on the trace element analyses of single glass shards

Pearce, N. J.; Alloway, B. V.; Westgate, J. A. (2008-02-01)
Mid-Pleistocene silicic tephra beds in the Auckland region, New Zealand: Their correlation and origins based on the trace element analyses of single glass shards

Pearce, Nicholas J. G.; Westgate, John A.; Alloway, Brent V. (2008-02)

The trace element composition of individual glass shards from twelve distinct mid-Pleistocene silicic tephra beds from the Auckland region, New Zealand, has been determined by laser ablation (LA) ICP-MS analysis. This is ...

Now showing items 112-131 of 201

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