Strukturna analiza rasjeda i smičnih pukotina i proračun paleonaprezanja u jugoistočnom dijelu Velebita

master's thesis

• Title: Strukturna analiza rasjeda i smičnih pukotina i proračun paleonaprezanja u jugoistočnom dijelu Velebita : diplomski rad
• Title (english): Structural analysis of faults and shear joints and calculation of palaeostress tensors on south-east part of the Velebit Mountain : master’s thesis
• Author: Gordan Mlinarić
• Mentor: Bruno Tomljenović (mentor)
• Committee member: Bruno Tomljenović
• Committee member: Igor Vlahović
• Committee member: Uroš Barudžija
• Granter: University of Zagreb; Faculty of Mining, Geology and Petroleum Engineering; (Department of Geology and Geological Engineering); Zagreb
• Defense date and country: 2014-07-10, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Mining, Petroleum and Geology Engineering; Geological Engineering

Abstract

Terenskim strukturno-geološkim istraživanjem na području jugoistočnog dijela planine
Velebit u Vanjskim Dinaridima prikupljeni su podaci o rasjedima i smičnim pukotinama u
karbonatnim brečama donjokredne i paleogensko-neogenske starosti. Podaci su analizirani
pomoću računalnog programa Win-Tensor (verzija 4.04.) kojim su, na temelju kinematske
kompatibilnosti, izdvojene četiri grupe rasjeda, odnosno smičnih pukotina. Rasjedi grupe 1
interpretirani su kao najmlađe formirani rasjedi, nastali tijekom pliocena i kvartara u
transpresijskom režimu paleonaprezanja, s pružanjem glavne kompresijske osi po pravcu
SZ−JI i tenzijske osi po pravcu SI−JZ. Grupu 2 čine normalni rasjedi pružanja ZSZ−IJI
koji ukazuju na ekstenzijski režim paleonaprezanja, s pružanjem tenzijske osi po pravcu
SSI-JJZ, odnosno praktički okomito na dominantno pružanje glavnih kompresijskih
struktura u istraživanom području Velebita. Formiranje rasjeda grupe 2 pretpostavlja se
tijekom oligocena, a moguće i u miocenu. Grupu 3 čine normalni rasjedi s dijagonalnim
pomakom (normalni−lijevi i normalni−desni), a koji ukazuju na ekstenzijski režim
paleonaprezanja, s pružanjem tenzijske osi po pravcu ISI−ZJZ. Grupu 4 čine reversni
rasjedi pružanja ISI−ZJZ, nastali u režimu paleonaprezanja s pružanjem glavne
kompresijske osi po pravcu SSZ−JJI. Nastanak rasjeda ove grupe pretpostavlja se sredinom
i krajem eocena i u oligocenu. Također, ovim radom analizirani su i podaci o rasjedima i
smičnim pukotinama prikupljeni u tercijarnim karbonatnim brečama (tzv. Jelar-naslage,
odnosno Velebitske breče) u središnjem dijelu Velebita u cilju korelacije s podacima
prikupljenim u okviru ovog rada. Na temelju ovih podataka izdvojene su također 4 grupe
rasjeda, koje su, zajedno s grupama izdvojenim na području istraživanja, interpretirane u
kronološkom slijedu tektonskog razvitka planine Velebit opisanog u literaturi.

Abstract (english)

Abstract: This Diploma thesis includes collection, analysis and interpretation of structural data about
faults and shear joints observed in carbonate breccias of Lower Cretaceous, Palaeogene
and Neogene age exposed on the southeastern part of the Velebit Mt. in the External
Dinarides. Collected data were analyzed by Win-Tensor (ver. 4.04.) software in order to
separate kinematically compatible fault groups formed during particular palaeostress
regimes. Four groups of faults have been separated. Group 1 comprises the youngest
interpreted faults and shear joints presumed as formed during the Pliocene and Quaternary,
in transpressional palaeostress regime, characterized by NW−SE and NE−SW trending
compressional and tensional axis, respectively. Group 2 is composed of WNW−ESE
striking normal faults, formed in extensional palaeostress regime with NNE−SSW trending
tensional axis, i.e. almost perpendicular to predominant strike of the major compressional
structures in study area of the SE part of the Velebit Mt. Formation of faults of this group
is assumed during the Oligocene and possibly Miocene. Group 3 consists of
normal−dextral and normal−sinistral faults that indicate extensional palaeostress regime
characterised by ENE−WSW trending tensional axis. Group 4 comprises ENE−WSW
striking reverse faults, formed in compressional palaeostress regime with NNW−SSE
trending compressional axis. Formation of this fault group is presumed during mid−to−late
Eocene and Oligocene. Further more, data previously collected in Tertiary carbonate
breccias (Jelar-deposits, or Velebit breccias) in the central part of the Velebit Mt. have
been analyzed as well, using the same methodology and software, in order to make a
correlation between recorded data from the two areas. As a result, four groups of faults
have been separated which were, together with the groups recorded by this thesis,
interpreted within different stages of the tectonic evolution of the Velebit Mt. proposed so
far.

• Keywords: Velebit; analiza rasjeda; analiza smičnih pukotina; Win-Tensor; rasjedi; smične pukotine
• Keywords (english): Velebit; analysis of faults; analysis of shear joints; Win-Tensor; faults; shear joints
• Language: croatian
• URN:NBN: urn:nbn:hr:169:504023
• Study programme: Title: Geological Engineering; Study programme type: university; Study level: graduate; Academic / professional title: magistar/magistra inženjer/inženjerka geološkog inženjerstva (magistar/magistra inženjer/inženjerka geološkog inženjerstva)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Access restricted to students and staff of home institution
• Created on: 2015-12-21 13:54:15