Porosity changes induced by salt weathering of sandstones, Bohemian Cretaceous Basin, Czech Republic
Result description
Pore parameters of weathered and non-weathered sandstones were determined using mercury intrusion porosimetry. Two types of rock crusts were distinguished on morphological basis: 1. patterned rock crusts with a variety of weathering forms (honeycombs, wandkarren), and 2. armoured rock crusts with a relatively smooth, hardened layer. Patterned rock crusts show an increase in the size of macropores relative to unweathered sandstone, which implies an increase in total effective porosity. This is explainedby the subflorescent growth of salt crystals. Armoured rock crusts on fine-grained sandstone show a reduced volume and size of macropores, as these are filled with clay mineral aggregates and gypsum crystals. Insufficient passability of macropores in thearmoured layer for pore waters shifts the evaporation front deeper into the rock. This results in contour scaling as the main process of rock-surface degradation, as opposed to granular disintegration on patterned rock crusts.
Keywords
porositysandstonerock crustsalt weatheringcase hardeninghoneycombs
The result's identifiers
Result code in IS VaVaI
Alternative codes found
RIV/67985891:_____/11:00359012
Result on the web
DOI - Digital Object Identifier
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Alternative languages
Result language
angličtina
Original language name
Porosity changes induced by salt weathering of sandstones, Bohemian Cretaceous Basin, Czech Republic
Original language description
Pore parameters of weathered and non-weathered sandstones were determined using mercury intrusion porosimetry. Two types of rock crusts were distinguished on morphological basis: 1. patterned rock crusts with a variety of weathering forms (honeycombs, wandkarren), and 2. armoured rock crusts with a relatively smooth, hardened layer. Patterned rock crusts show an increase in the size of macropores relative to unweathered sandstone, which implies an increase in total effective porosity. This is explainedby the subflorescent growth of salt crystals. Armoured rock crusts on fine-grained sandstone show a reduced volume and size of macropores, as these are filled with clay mineral aggregates and gypsum crystals. Insufficient passability of macropores in thearmoured layer for pore waters shifts the evaporation front deeper into the rock. This results in contour scaling as the main process of rock-surface degradation, as opposed to granular disintegration on patterned rock crusts.
Czech name
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Czech description
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Classification
Type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP classification
DB - Geology and mineralogy
OECD FORD branch
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Result continuities
Project
Continuities
P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)
Z - Vyzkumny zamer (s odkazem do CEZ)
Others
Publication year
2011
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Acta geodynamica et geomaterialia
ISSN
1214-9705
e-ISSN
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Volume of the periodical
8
Issue of the periodical within the volume
1
Country of publishing house
CZ - CZECH REPUBLIC
Number of pages
17
Pages from-to
29-45
UT code for WoS article
000290696600003
EID of the result in the Scopus database
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Basic information
Result type
Jx - Unclassified - Peer-reviewed scientific article (Jimp, Jsc and Jost)
CEP
DB - Geology and mineralogy
Year of implementation
2011