Dolgoročne spremembe okolja 1

0382140 - GLÚ 2013 RIV SI slv M - Část monografie knihy
Zupan Hajna, N. - Mihevc, A. - Pruner, Petr - Bosák, Pavel
Starost jamskih sedimentov v Sloveniji.
[The age of cave sediments in Slovenia.]
Dolgoročne spremembe okolja 1. Ljubljana: Inštitut za arheologijo ZRC SAZU, Založba ZRC, Collegium graphicum, 2012 - (Andrič, M.), s. 89-100. Opera Instituti archaeologici Sloveniae, 25. ISBN 978-961-254-376-1
Institucionální podpora: RVO:67985831
Klíčová slova: karst * sediments * caves * karst (Slovenia)
Kód oboru RIV: DB - Geologie a mineralogie

Kras kot geomorfni sistem je pomemben kopenski vir informacij o preteklih razmerah v okolju. Njihov najpomembnejši nosilec so različni sedimenti, ki so prisotni in široko razširjeni po površju, predvsem pa v jamah, ki delujejo kot pasti, v katerih se nabirajo in predvsem dobro ohranjajo. V zadnjih dvajsetih letih je poznavanje starosti jamskih sedimentov v Sloveniji močno napredovalo, in to predvsem zaradi uporabe različnih datacijskih metod. Pred tem je prevladovalo mnenje, da so jamski sedimenti in tudi jame relativno mladi, da so se sedimenti v jamah odložili predvsem v pleistocenu in da jame niso bistveno starejše. Posebno nov pogled na sedimentacijo v jamah so odprle paleomagnetne in magnetostratigrafske raziskave, podprte z numeričnimi datacijami, mineraloškimi, petrološkimi, geokemičnimi in geomorfološkimi analizami. Z najnovejšimi študijami jamskih sedimentov v Sloveniji smo prišli do spoznanja, da so interpretacije posameznih faz odlaganja različnih sedimentov v jamah, vezanih samo na klimatske pogoje znotraj kvartarja, preveč enostavne, da so najstarejši jamski sedimenti verjetno miocenske starosti, da se sedimenti v jamah zelo dobro ohranijo in da vsebujejo zelo dobre podatke o klimatskih in drugih okoljskih spremembah neposredne okolice, česar nam razni globalni kazalniki sprememb ne pokažejo.

Karst as a geomorphic system is an important terrestrial source of information about past environmental conditions. Carriers of data are karst sediments, present and widespread above the karst surface and especially in the caves, which act as sediment traps, accumulating various sediments. In the last twenty years, the knowledge of the ages of cave sediments in Slovenia has made substantial progress, primarily because of the use of different dating methods. Previously it was believed that the cave sediments and caves are relatively young and that the sediments in the caves sedimented mostly during the Pleistocene and that the caves are not much older. A new look at sedimentation in caves was opened with paleomagnetic and magnetostratigraphic research supported by numerical dating, mineralogical, petrological, geochemical and geomorphic analyses. With the latest studies of cave sediments in Slovenia we have come to realize that: the interpretation of the various stages of deposition of different sediments in the caves, linked only to the climatic conditions within the Quaternary, is too simple; that the oldest cave sediments are probably Miocene in age; that sediments in the caves are very well preserved and that they contain very good information on climate and other environmental changes of their surroundings, which various indicators of global changes do not offer.
Trvalý link: http://hdl.handle.net/11104/0212448