Factors controlling evolution of karst conduits in sandy limestone and calcareous sandstone (Turnov area, Czech Republic)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985891%3A_____%2F19%3A00509425" target="_blank" >RIV/67985891:_____/19:00509425 - isvavai.cz</a>

Alternative codes found

RIV/00216208:11310/19:10405310 RIV/00023272:_____/19:10134379 RIV/00025798:_____/19:00000176

Result on the web

<a href="https://www.sciencedirect.com/science/article/pii/S0022169419304585?via%3Dihub" target="_blank" >https://www.sciencedirect.com/science/article/pii/S0022169419304585?via%3Dihub</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.jhydrol.2019.05.013" target="_blank" >10.1016/j.jhydrol.2019.05.013</a>

Result language

angličtina

Original language name

Factors controlling evolution of karst conduits in sandy limestone and calcareous sandstone (Turnov area, Czech Republic)

Original language description

Karst potential is rarely studied in calcareous sandstones and sandy limestones. The minimum content of carbonate necessary for the development of conduits is unknown, and the mechanisms of the origins of conduits in these rocks are poorly understood. This article focuses upon these questions in an important regional aquifer. Samples of limestones and sandstones were taken from outcrops in vertical profiles, and were subjected to a rapid dissolution test with 10% HCI. The degree of disintegration of the samples after dissolution of the carbonate was observed in order to estimate which portions of the rock enabled formation of karst conduits. Carbonate content was measured by calcimetry. Distribution of calcite cement and other sources of cohesion were studied by scanning electron microscopy. Tracer tests in the conduits were evaluated. Calcite is the dominant carbonate mineral and main cementing agent in the Jizera Fm. Aquifer (mean content 51%). However, calcite content was found to be a weak predictor of karst potential. Most of the samples disintegrated completely if the calcite content exceeded 55%. On the other hand, some rocks with a calcite content up to 70% did not disintegrate due to microcrystalline/amorphous silica, which bound the quartz grains together and/or formed a foam-like supporting structure. After in situ calcite dissolution, the rock in karst-prone zones is turned to residuum, which consequently is washed out by fast flow (0.01-0.2 m/s, based on tracer tests). Microscopic study of cementing agents of the siliciclastic-carbonate sediments and dissolution tests are essential for understanding the mechanisms of conduit origin in ghost-rock karst.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10505 - Geology

Project

Result was created during the realization of more than one project. More information in the Projects tab.

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2019

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Hydrology

ISSN

0022-1694

e-ISSN

—

Volume of the periodical

574

Issue of the periodical within the volume

JUL 2019

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

12

Pages from-to

1062-1073

UT code for WoS article

000476962800084

EID of the result in the Scopus database

2-s2.0-85066062051