Kvartarni sedimenti na območju čistilne naprave Bled

diplomsko delo

Nina Pretnar (Author), Andrej Šmuc (Mentor), Aleksander Horvat (Co-mentor)

Abstract

Čistilna naprava Bled je locirana med južnim robom Blejskega jezera in Savo Bohinjko, med reko Jezernico ter vzpetinama Obroč in Kozarca na nadmorski višini 450 m. Ob izkopu gradbene jame za usedalnik čistilne naprave je bilo odkrito zaporedje mlajšepleistocenskih in holocenskih sedimentov, kar je omogočilo podrobnejši vpogled v stratigrafski, sedimentacijski in paleoekološki razvoj raziskovanega območja. Zaporedje sestavlja več nivojev prodnato-peščenih glaciofluvialnih sedimentov, debeline približno 380 cm, glinastih in muljasto-peščenih jezerskih sedimentov, katerih natančne debeline nismo mogli določiti, ocenjujemo jo na približno 150 cm in sladkovodnih biogenih karbonatnih tvorb, debeline 100 cm. Slednje gradi pahljačasto telo lehnjakovih sedimentov, ki je sestavljeno iz kompleksa kanalov ter diskontinuiranih plasti lehnjakovega drobirja, lehnjaka in plasti muljasto-peščenega karbonatnega sedimenta, med katerimi se pojavljajo fitohermne tvorbe. V spodnjem delu zaporedja so vidne deformacijske teksture. Glede na določeno starost sedimentov procese nastanka sedimentnih zaporedij povežemo z glaciofluvilanim in aluvialnim sedimentacijskim režimom ob deglaciaciji ob koncu zadnjega glacialnega viška. Lehnjak se na raziskovanem območju danes ne odlaga več in je popolnoma izoliran od današnjega rečnega sistema Save in pritokov. Predvidevamo, da je bilo izločanje lehnjaka relativno kratkotrajno ter povezano s postglacialnim razvojem Blejskega jezera in njegovih iztokov.

Keywords

geologija;glaciofluvialni sedimenti;lehnjak;14C datacije;pozni glacial;holocen;

Data

Language:	Slovenian
Year of publishing:	2015
Typology:	2.11 - Undergraduate Thesis
Organization:	UL NTF - Faculty of Natural Sciences and Engineering
Publisher:	[N. Pretnar]
UDC:	55
COBISS:	1236830
Views:	1429
Downloads:	412
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Quaternary sediments in the area of wastewater treatment plant Bled
Secondary abstract:	Wastewater treatment plant Bled is located between the southern edge of Lake Bled and river Sava Bohinjka, the river Jezernica and the hills Obroč and Kozarca at an altitude of 450 m. During excavation works for the plant, around 7m thick succession of late Pleistocene and Holocene sediments was discovered. The aim of this thesis is detailed sedimentological analysis of these sediments and interpretation of the evolution of the area in the aforementioned time frame. The investigated succession starts with multiple layers of glacio-fluvial sediments ranging from gravel to sand with a thickness of approximately 380 cm, continues with lacustrine clays, silts and sands with thickness of approximately 150 cm and ends with freshwater biogenic carbonate accumulations with a thickness of 100 cm. The latter represents tufa sediments, which consists of a complex of channels and discontinuous layers of debris tufa, travertine and layers of silty-sandy carbonate sediment, among which appear phytoherm forms. In the lower part of the succession also deformation textures are visible. The lower part of the succession was formed in glacio-fluvial and alluvial sedimentation regime at the end of the last glacial peak. Tufa in this area does not deposit anymore and is completely isolated from the today's Sava river. We assume that the formation of tufa was relatively short-lived and associated with post-glacial evolution of Lake Bled and its tributaries.
Type (COBISS):	Undergraduate thesis
Thesis comment:	Univ. v Ljubljani, Naravoslovnotehniška fak., Oddelek za geologijo
Pages:	56 f.
ID:	9115060