a mineral deposit formed in caves by the evaporation of mineral-rich water, as a stalactite, stalagmite, or helictite
Examples of 'speleothem' in a sentence
speleothem
Streptomyces genera isolates from moonmilk speleothem demonstrated antibacterial and antifungal activities.
Denis V Axenov-Gribanov, Irina V Voytsekhovskaya, Bogdan T Tokovenko, Eugeniy S Protasov,Stanislav V Gamaiunov, Yuriy V Rebets, Andriy N Luzhetskyy, Maxim A Timofeyev 2016, 'Actinobacteria Isolated from an Underground Lake and Moonmilk Speleothem from theBiggest Conglomeratic Karstic Cave in Siberia as Sources of Novel Biologically ActiveCompounds.', PLoS ONEhttp://europepmc.org/articles/PMC4764329?pdf=render. Retrieved from PLOS CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
These biofilms may represent sites of early speleothem formation.
Therese Sallstedt, Magnus Ivarsson, Johannes Lundberg, Rabbe Sjöberg, Juan Ramón VidalRomaní 2014, 'Speleothem and biofilm formation in a granite/dolerite cave, Northern Sweden', International Journal of Speleologyhttp://scholarcommons.usf.edu/ijs/vol43/iss3/7/. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
We also investigated the biomineralization abilities of speleothem surface associated microbial communities in vitro.
Navdeep K. Dhami, Abhijit Mukherjee, Elizabeth L. J. Watkin 2018, 'Microbial Diversity and Mineralogical-Mechanical Properties of Calcitic Cave Speleothemsin Natural and in Vitro Biomineralization Conditions', Frontiers in Microbiologyhttp://journal.frontiersin.org/article/10.3389/fmicb.2018.00040/full. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
24 different activators of photoluminescence of speleothem calcite and 11 of aragonite are studied.
Shopov Yavor Y. 2004, 'Activators of luminescence in speleothems as source of major mistakes in interpretationof luminescent paleoclimatic records', International Journal of Speleologyhttp://www.ijs.speleo.it/pdf/61.517.33_Shopov_activators.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Mixing processes in the soil and karst above the cave represent a natural low-pass filter of the speleothem climate archive.
G. Lohmann, A. Wackerbarth, P. M. Langebroek, M. Werner, J. Fohlmeister, D. Scholz,A. Mangini 2013, 'Simulated European stalagmite record and its relation to a quasi-decadal climate mode',Climate of the Pasthttp://www.clim-past.net/9/89/2013/cp-9-89-2013.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Seven out of the fifty known evaporite cave minerals, and around 10 speleothem types/subtypes are exclusive to these environments.
Paolo Forti 2017, 'Chemical deposits in evaporite caves: an overview', International Journal of Speleologyhttp://scholarcommons.usf.edu/ijs/vol46/iss2/1/. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Once the underground stream left the cave and most of the sediment was removed, speleothem precipitation was initiated.
Cristina M. Pușcaș, Ciprian C. Stremtan, Ferenc Kristály 2010, 'Past surface conditions and speleogenesis as inferred from cave sediments in the GreatCave of Șălitrari Mountain (SW Romania)', Studia Universitatis Babes-Bolyai: Geologiahttp://scholarcommons.usf.edu/geologia/vol55/iss2/art4/. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Many issues conspire to make the assessment of biogenicity difficult, especially when focusing on old speleothem deposits.
M. Pacton, S. F. M. Breitenbach, F. A. Lechleitner, A. Vaks, C. Rollion-Bard, O. S.Gutareva, A. V. Osintcev, C. Vasconcelos 2013, 'The role of microorganisms in the formation of a stalactite in Botovskaya Cave, Siberia– paleoenvironmental implications', Biogeoscienceshttp://www.biogeosciences.net/10/6115/2013/bg-10-6115-2013.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)
Microbial activity can initiate calcite deposition in the aphotic zone of caves before inorganic precipitation of speleothem carbonates.
M. Pacton, S. F. M. Breitenbach, F. A. Lechleitner, A. Vaks, C. Rollion-Bard, O. S.Gutareva, A. V. Osintcev, C. Vasconcelos 2013, 'The role of microorganisms in the formation of a stalactite in Botovskaya Cave, Siberia– paleoenvironmental implications', Biogeoscienceshttp://www.biogeosciences.net/10/6115/2013/bg-10-6115-2013.pdf. Retrieved from DOAJ CC BY 4.0 (https://creativecommons.org/licenses/by-sa/4.0/legalcode)