Environmental record in detrital cave sediments in the Botovskaya and Dolganskaya Jama caves (Russian Federation)

0054980 - GLÚ 2007 US eng A - Abstrakt
Lisá, Lenka - Kadlec, Jaroslav - Chadima, Martin - Hercman, H. - Oberhansli, H. - Osincev, A.
Environmental record in detrital cave sediments in the Botovskaya and Dolganskaya Jama caves (Russian Federation).
[Environmentální záznam v detritických jeskynních sedimentech jeskynní Botovskaja a Dolganskaja Jama (Ruská federace).]
Geophysical Research Abstracts. Roč. 8, - (2006), A10273-A10273. ISSN 1607-7962.
[European Geosciences Union General Assembly. 02.04.2006-07.04.2006, Vienna]
Výzkumný záměr: CEZ:AV0Z30130516
Klíčová slova: cave * sediments * micromorphology * magnetic properties * provenance
Kód oboru RIV: DB - Geologie a mineralogie
http://www.cosis.net/abstracts/EGU06/10273/EGU06-J-10273-2.pdf

The Botovskaya Cave which is developed in the Angarsko-Lensky Plateau ca 700 km N of Irkutsk in Ordovician limestones, is an example of a horizontal two-dimensional maze with a total length of explored passages exceeding 60 km. The cave system is located 310 m above the Lena River level. The detrital cave fills differ both in mineral magnetic and mineralogical parameters. Two depositional events could be observed. The older sediments consist of sands showing low magnetic susceptibility (MS) and low radioactivity values and are derived from weathered sandy Cambrian bedrocks. The sediments were transported by horizontally running water entering the cave system when the relief was peneplained, probably during the Late Tertiary. The overlying cave deposits, predominantly clays and sandy clays, reveal higher MS and radioactivity values and were transported vertically to the cave passages during rain or meltwater events.
Trvalý link: http://hdl.handle.net/11104/0142851