GPR survey to reveal a possible tectonic tilt of the Brežice Sava river terrace in the Krško basin

Marjana Zajc (Author), Marijan Poljak (Author), Andrej Gosar (Author)

Abstract

It has been supposed that the Brežice Sava River Terrace (BSRT) is tectonically disturbed near the town of Brežice and tilted to the north. To confirm this tectonically induced tilt in a quantitative sense, low-frequency Ground Penetration Radar (GPR) was applied. A total of eight GPR profiles were recorded across the BSRT providing information of the lower boundary of the terrace, which consists of loose to poorly cemented Quaternary gravel, while its Tertiary basement consists of poorly cemented carbonaceous silt (marl). The premise of the study was the assumption that this lithological boundary could be detected by the GPR method. In addition to the upper surface of the BSRT being tilted to the north by 0.18°, GPR profiles also showed a 0.04° difference in the tilt between the upper surface of the terrace and its lower boundary with the basement, which we assigned to the sin-sedimentary tilt. Upon this information, a cumulative tectonically induced dip of the BSRT lower boundary was defined at 0.22°.

Keywords

tektonski nagib;seizmično refleksijsko profiliranje;georadar;Krška kotlina;Brežiška terasa reke Save;

Data

Language:	English
Year of publishing:	2021
Typology:	1.01 - Original Scientific Article
Organization:	GeoZS - Geological Survey of Slovenia
Publisher:	Geološki zavod Slovenije
UDC:	55
COBISS:	45155331
ISSN:	0016-7789
Parent publication:	Geologija
Views:	900
Downloads:	368
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	Slovenian
Secondary title:	Georadarska raziskava za določitev možnega tektonskega nagiba Brežiške terase reke Save v Krški kotlini
Secondary abstract:	Domneva se, da je Brežiška terasa reke Save (BSRT) pri mestu Brežice tektonsko porušena oz. nagnjena proti severu. Da bi lahko ta tektonsko induciran nagib tudi kvantitativno določili, smo uporabili nizkofrekvenčni georadar (GPR). Po celotni BSRT je bilo posnetih osem georadarskih profilov, ki dajejo informacije o spodnji meji terase, ki je sestavljena iz slabo cementiranega kvartarnega proda, medtem ko je njena terciarna podlaga sestavljena iz slabo cementiranega karbonatnega melja (laporja). Predpostavka študije je bila domneva, da je z metodo georadarja mogoče zaznati omenjeno litološko mejo. Georadarski profili so poleg tega, da je zgornja površina BSRT nagnjena proti severu za 0,18°, pokazali tudi 0,04° razlike v nagibu med zgornjo površino terase in njeno spodnjo mejo s podlago, kar smo pripisali sin-sedimentacijskemu nagibu. Glede na te podatke je bila kumulativna tektonsko inducirana nagnjenost spodnje meje BSRT določena na 0,22°.
Secondary keywords:	Brežiška terasa reke Save;Krška kotlina;georadar;tektonski nagib;seizmično refleksijsko profiliranje;
Pages:	str. 5-19
Volume:	ǂVol. ǂ64
Issue:	ǂno. ǂ1
Chronology:	2021
DOI:	10.5474/geologija.2021.001
ID:	12349047