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Pregled bibliografske jedinice broj: 535073

Časopis

Autori: Lacković, Damir; Glumac, Bosiljka; Asmerom, Yemane; Stroj, Andrej
Naslov: Evolution of the Veternica Cave (Medvednica Mountain, Croatia) drainage system: insights from the distribution and dating of cave deposits
Izvornik: Geologia Croatica : journal of the Croatian Geological Survey and the Croatian Geological Society (1330-030X) 64 (2011), 3; 213-221
Vrsta rada: članak
Ključne riječi: speleogenesis ; shelfstone ; fl owstone ; U-Th dating ; water table lowering ; Veternica Cave ; Croatia
Sažetak:
Detailed fi eld examination, U-Th age dating, and stable isotope analysis of Veternica fl owstone and shelfstone deposits have been employed in order to unravel details about the geological history of Veternica Cave (Medvednica Mountain, Croatia). The study was carried out in the hydrologically inactive part of the main cave channel, which is developed mainly along the unconformity between Triassic dolostone and Miocene limestone. For 180 m from the cave entrance, (located at 320 metres above sea level (asl)), the morphology of the main channel refl ects exclusively phreatic conditions in the cave until the end of its hydrological activity. From 180 to 390 m, the phreatic channel has a secondary vadose entrenchment in the bottom part as marked by massive fl owstones at elevations from 306 to 313.5 m asl. From 390 m farther inside the cave (in the upstream direction), the main channel has a tall, narrow cross-section and is of mainly vadose origin. In this part of the cave shelfstone precipitates are observed at 9 different levels ranging from 318.8 to 320.2 m asl, indicating the water palaeolevels in the cave. U-Th dating revealed the age of the highest shelfstone (320.2 m asl) of ~380 kyrs BP, and the age of the lowermost analyzed shelfstone (318.9 m asl) of ~245 kyrs BP. Dating of fl owstone deposits, located below the shelfstone level, revealed their formation from ~235 to 205 kyrs BP. A relatively rapid water table lowering and transition from phreatic to vadose conditions occurred within the cave, from ~245 to 235 ka BP, between formation of the youngest shelfstone (representing phreatic conditions below their level) and the oldest fl owstone (marking the beginning of vadose conditions). The results provide unique new information about Veternica Cave genesis and geomorphologic evolution of the Medvednica Mountain area.
Projekt / tema: 181-1811096-3165
Izvorni jezik: ENG
Rad je indeksiran u
bazama podataka:
Scopus
SCI-EXP, SSCI i/ili A&HCI
Science Citation Index Expanded (SCI-EXP) (sastavni dio Web of Science Core Collectiona)
Kategorija: Znanstveni
Znanstvena područja:
Geologija,Rudarstvo, nafta i geološko inženjerstvo
URL Internet adrese: http://http://www.geologia-croatica.hr
http://www.geologia-croatica.hr/ojs/index.php/GC/article/view/GC.2011.18/pdf
Broj citata:
Altmetric:
DOI: 10.4154/gc.2011.18
URL cjelovitog teksta:
Google Scholar: Evolution of the Veternica Cave (Medvednica Mountain, Croatia) drainage system: insights from the distribution and dating of cave deposits
Upisao u CROSBI: astroj@hgi-cgs.hr (astroj@hgi-cgs.hr), 8. Stu. 2011. u 15:53 sati



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