Naslov
Travertines and calcareous tufa deposits: a comparison

Autori
Plenković-Moraj, Anđelka ; Violante, Crescenzo ; Campbell, Susan ; Golubic, Stjepko ; Grgasović, Tonči

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
9th International Symposium on Fossil Algae - Croatia 2007, Field Trip Guidebook and Abstracts / Grgasović, Tonči ; Vlahović, Igor - Zagreb : Hrvatski geološki institut, 2007, 246-246

ISBN
978-953-6907-15-1

Skup
9th International Symposium on Fossil Algae - Croatia 2007

Mjesto i datum
Zagreb, Hrvatska, 19.09.2007. - 20.09.2007

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
travertine; calcareous tufa

Sažetak
Travertines and calcareous tufa are porous deposits formed by interaction between the processes of precipitation of calcium carbonate and resident organisms in natural waters, under different temperature regimes. The distinctions between travertine as thermal spring deposits and calcareous tufa (Kalktuff) as deposits in the springs and rivers at ambient temperatures (FORD & PEDLEY, 1996) are fluent. They represent the end points in biocalcification processes across a broad gradient of temperature, mineral composition and saturation levels. They involve interactions at the levels of carbonate chemistry, crystal nucleation (TURNER & JONES, 2005), and sediment accumulation (FREYTET & VERRECCHIA, 1998). These types of interaction between water chemistry and organisms (PLENKOVIĆ-MORAJ et al. 2002) have the capacity to divert water flow, modify the landscape and influence fossilization and diagenesis of calcareous tufa (GOLUBIC et al. 1993). Examples of modern and ancient travertine and tufa deposits formed under different climatic conditions, their diagenetic alterations and climatic signals as preserved in the fossil record (GOLUBIC et al 1995) are illustrated and discussed.

Izvorni jezik
Engleski

Znanstvena područja
Biologija

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