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Titolo:
THE NATURE AND PATTERN OF DEBRIS LIBERATION BY SALT WEATHERING - A LABORATORY STUDY
Autore:
GOUDIE AS; VILES HA;
Indirizzi:
UNIV OXFORD,SCH GEOG,MANSFIELD RD OXFORD OX1 3TB ENGLAND UNIV OXFORD ST CATHERINES COLL OXFORD OX1 3UJ ENGLAND
Titolo Testata:
Earth surface processes and landforms
fascicolo: 5, volume: 20, anno: 1995,
pagine: 437 - 449
SICI:
0197-9337(1995)20:5<437:TNAPOD>2.0.ZU;2-R
Fonte:
ISI
Lingua:
ENG
Soggetto:
SIMULATION; ROCK; HOT; RATES;
Keywords:
LABORATORY SIMULATION; SALT WEATHERING; GRANULOMETRY; RATES; LIMESTONES;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
18
Recensione:
Indirizzi per estratti:
Citazione:
A.S. Goudie e H.A. Viles, "THE NATURE AND PATTERN OF DEBRIS LIBERATION BY SALT WEATHERING - A LABORATORY STUDY", Earth surface processes and landforms, 20(5), 1995, pp. 437-449

Abstract

A laboratory simulation of salt weathering was used to ascertain the effects of sodium sulphate and sodium carbonate under 'Negev' conditions using a single immersion technique, Three main points were addressed: what are the grain size and textural characteristics of the debris liberated from limestones and a sandstone, what do scanning electron microscope observations of the weathered samples tell us about the decay processes involved, and how does the rate of debris liberation change during the course of 100 cycles? The grain size characteristics of the liberated debris tended to be multi-modal and were related to the original petrological characteristics of the rock. Large amounts of fines were produced which are believed to be analogous to the 'rock flour' of arid areas. Blistering was also observed. Scanning electron microscope analysis revealed differences in the style of attack for different rock types and salt treatments, and revealed the pattern of salt crystallization in pores and the nature of cracking. The rate of debris liberation tended to decline or remain constant through time. The reasons for this remain obscure, but it is evident that diurnal cycles of temperature and humidity change can cause continuing rock weathering long after the initial input of salt to the rock has taken place.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 28/11/20 alle ore 18:50:25