Speleothems in sandstone crevice and boulder caves of the Elbe River Canyon, Czech Republic

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F67985831%3A_____%2F22%3A00561806" target="_blank" >RIV/67985831:_____/22:00561806 - isvavai.cz</a>

Nalezeny alternativní kódy

RIV/00216208:11310/22:10448828

Výsledek na webu

<a href="https://digitalcommons.usf.edu/ijs/vol51/iss2/6/" target="_blank" >https://digitalcommons.usf.edu/ijs/vol51/iss2/6/</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.5038/1827-806X.51.2.2427" target="_blank" >10.5038/1827-806X.51.2.2427</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Speleothems in sandstone crevice and boulder caves of the Elbe River Canyon, Czech Republic

Popis výsledku v původním jazyce

A variety of speleothems are present in crevice and boulder caves developed in Cretaceous sandstones of the Elbe River canyon in northern Czech Republic. A set of complementary instrumental mineralogical methods was applied to characterize the speleothems and cave dripwaters, including X-ray powder diffraction, scanning electron microscopy and microanalysis, Raman spectroscopy and optical emission spectrometry. Four morphological types were distinguished and characterized in terms of their mineral and chemical composition: 1, rusty brown mud-dominated coatings with micro-gours, composed of a mixture of clay minerals, 2, white “chalky” coatings (moonmilk) composed of calcite with minor gypsum, 3, cauliflower-shaped coralloids composed of calcite and silica in a layered structure, with gypsum layers in apical parts, 4, knob coralloids, dark gray-brown with smooth surfaces and distinctly layered structures, composed of silica (quartz, opal-A) and Si–Al phases (kaolinite) and including phosphate-rich laminae (sasaite, vashegyite, taranakite). Only modest microbial mediation of silica precipitation was observed in cauliflower-shaped coralloids while no clear signs are present in knob coralloids despite organic enrichment in the topmost layer. White “chalky” coatings and cauliflower-shaped coralloids precipitated from weakly acidic Ca-, Mgand sulphate-rich deeper sandstone percolates. These forms are probably still active, much like the micro-gours, produced by particulate clay deposition. Formation of knob coralloids combined clay deposition and the dominant silica precipitation from pore waters similar to the present shallow acidic percolates under changing climatic conditions, probably in the Pleistocene. It was favored by specific rock lithology (quartzose sandstone with kaolinite admixture), which explains the scarcity of similar forms in sandstone caves. Concentration of knob coralloids along protruding vertical edges and the presence of wind-guided forms suggests that silica precipitation was driven by evaporation under a constant air flow.

Název v anglickém jazyce

Speleothems in sandstone crevice and boulder caves of the Elbe River Canyon, Czech Republic

Popis výsledku anglicky

A variety of speleothems are present in crevice and boulder caves developed in Cretaceous sandstones of the Elbe River canyon in northern Czech Republic. A set of complementary instrumental mineralogical methods was applied to characterize the speleothems and cave dripwaters, including X-ray powder diffraction, scanning electron microscopy and microanalysis, Raman spectroscopy and optical emission spectrometry. Four morphological types were distinguished and characterized in terms of their mineral and chemical composition: 1, rusty brown mud-dominated coatings with micro-gours, composed of a mixture of clay minerals, 2, white “chalky” coatings (moonmilk) composed of calcite with minor gypsum, 3, cauliflower-shaped coralloids composed of calcite and silica in a layered structure, with gypsum layers in apical parts, 4, knob coralloids, dark gray-brown with smooth surfaces and distinctly layered structures, composed of silica (quartz, opal-A) and Si–Al phases (kaolinite) and including phosphate-rich laminae (sasaite, vashegyite, taranakite). Only modest microbial mediation of silica precipitation was observed in cauliflower-shaped coralloids while no clear signs are present in knob coralloids despite organic enrichment in the topmost layer. White “chalky” coatings and cauliflower-shaped coralloids precipitated from weakly acidic Ca-, Mgand sulphate-rich deeper sandstone percolates. These forms are probably still active, much like the micro-gours, produced by particulate clay deposition. Formation of knob coralloids combined clay deposition and the dominant silica precipitation from pore waters similar to the present shallow acidic percolates under changing climatic conditions, probably in the Pleistocene. It was favored by specific rock lithology (quartzose sandstone with kaolinite admixture), which explains the scarcity of similar forms in sandstone caves. Concentration of knob coralloids along protruding vertical edges and the presence of wind-guided forms suggests that silica precipitation was driven by evaporation under a constant air flow.

Druh

J_imp - Článek v periodiku v databázi Web of Science

CEP obor

—

OECD FORD obor

10504 - Mineralogy

Projekt

<a href="/cs/project/GA19-14082S" target="_blank" >GA19-14082S: Napětím a hydraulickým polem řízené zvětrání a eroze granulárních hornin</a><br>

Návaznosti

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Rok uplatnění

2022

Kód důvěrnosti údajů

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

Název periodika

International Journal of Speleology

ISSN

0392-6672

e-ISSN

1827-806X

Svazek periodika

51

Číslo periodika v rámci svazku

2

Stát vydavatele periodika

IT - Italská republika

Počet stran výsledku

22

Strana od-do

141-162

Kód UT WoS článku

000862894800001

EID výsledku v databázi Scopus

2-s2.0-85138508434