http://www.cnr.it/ontology/cnr/individuo/prodotto/ID28971

Ice-flow dynamics and meteorite collection in Antarctica. (Articolo in rivista)

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Ice-flow dynamics and meteorite collection in Antarctica. (Articolo in rivista) (literal)

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CORTI G., ZEOLI A., BONINI M. (2003)
Ice-flow dynamics and meteorite collection in Antarctica.
in Earth and planetary science letters
(literal)

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This paper provides important insights into the dynamic of meteorites accumulation in Antarctica, which represents a topic that is of a broad interest in the international scientific community as it involves the improving our knowledge about the complex processes leading to meteorites accumulation and traps formation. Particularly, the current results offer significant indications for the discovery of further potential areas of meteorites concentration. The approach we have used to investigate the problem of ice dynamics and meteorites accumulation is novel and we believe it has the potential for being further applied for studying the complex interactions between ice flow and substratum, and their influence on meteorites accumulation. As a matter of fact, the results of modelling have been published on Earth and Planetary Science Letters, representing one of the most important journal in Earth Sciences. (literal)

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The paper reports a detailed and original study concerning ice flow dynamics controlling meteorites trapping at Frontier Mountain, Antarctica, where an exceptionally complete set of glaciological data was available to investigate the causes leading to meteorites concentration. The analysis has been carried out by means of analogue modelling, a technique that is widely used in many fields of the earth sciences. Detailed analysis of the experimental results provided new insights into the dynamic interactions between ice flow and the submerged and emerged bedrock that have obviously important implications for meteorite search in Antarctica. Analysis of model results involves also implications about the role played by ablation in ice dynamics. Our results support the contention that ablation does not play a primary role in controlling the ice dynamics. (literal)

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G. Corti 1, A. Zeoli 2, M. Bonini 1 1 C.N.R. Istituto di Geoscienze e Georisorse, Sezione di Firenze, via G. La Pira, 4, 50121 Firenze, Italy 2 Museo Nazionale Antartide, Università degli Studi di Siena, via del Laterino, 8, 53100 Siena, Italy (literal)

Titolo

Abstract

Typical targets for meteorite search in the ice-sheet covering Antarctica are blue ice fields in front of major bedrock obstacles, where the meteorite-bearing ice slows down, is uplifted and exhumed by ablation. However, in some areas collection occurs in the lee of topographic barriers, as documented in the downstream side of the Frontier Mountain, a major emerged bedrock barrier. In this study we present an analogue modelling study of ice flow at Frontier Mountain, which has been chosen as example study area because an exceptionally complete set of glaciological data is available to investigate the causes leading to meteorite concentration. Results of modelling show how the boundary conditions (mainly the bedrock topography) control ice flow and how this flow, coupled to high ablation, may give rise to a stable meteorite trap downstream of major topographic obstacles. Modelling results support the contention that, as erosion is not a mountain builder, ablation does not represent a driving force in ice flow dynamics, although it plays a significant role in shaving stranding surfaces and exhuming meteorites. (literal)

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