Origin of Fracture-Controlled Conduits in Calcite-Rich Highly Productive Aquifers Impregnated with Diagenetic Silica
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F24%3A00585115" target="_blank" >RIV/67985891:_____/24:00585115 - isvavai.cz</a>
Alternative codes found
RIV/00216208:11310/24:10487701
Result on the web
<a href="https://doi.org/10.3390/w16050687" target="_blank" >https://doi.org/10.3390/w16050687</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.3390/w16050687" target="_blank" >10.3390/w16050687</a>
Alternative languages
Result language
angličtina
Original language name
Origin of Fracture-Controlled Conduits in Calcite-Rich Highly Productive Aquifers Impregnated with Diagenetic Silica
Original language description
The origin of highly permeable flow paths in carbonate-siliciclastic rocks, such as large-aperture fractures in aquifers in the Eastern Bohemian Cretaceous Basin (EBCB), is poorly understood. The karst potential was assessed from the rock carbonate content and the degree of disintegration after leaching in HCl. Surprisingly, dissolution of calcite in EBCB usually did not lead to rock disintegration until calcite > 78%. Instead, porosity increased significantly. High-porosity rock is held together by microns-thick secondary silica cement with a foam-like structure and considerable tensile strength. Three types of conduits occur in the EBCB: (i) bedding-parallel conduits associated with calcite-rich layers, (ii) subvertical fracture swarm conduits that develop on damaged zones of fracture swarms, and (iii) conduits formed by dissolution of calcite veins by groundwater flow. These are ghost-rock karst features where calcite is leached from the rock in the first phase and the residue is washed out by conduits under steep hydraulic gradients in the second phase. Very similar features have been described in Minnesota and Wisconsin, USA. Research has shown that fractures with sharp-edged walls that give the impression of an extensional tectonics origin may actually be ghost-rock karst features in which dissolution and piping have played an important role in their enlargement.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10501 - Hydrology
Result continuities
Project
<a href="/en/project/GA24-12696S" target="_blank" >GA24-12696S: Improved field method for quantifying strength and degree of weathering in granularly-disintegrating rocks</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Water
ISSN
2073-4441
e-ISSN
2073-4441
Volume of the periodical
16
Issue of the periodical within the volume
5
Country of publishing house
CH - SWITZERLAND
Number of pages
18
Pages from-to
687
UT code for WoS article
001183431800001
EID of the result in the Scopus database
2-s2.0-85187412959