Impact of mechanical stratigraphy on deformation style in the central External Dinarides: a 2D forward kinematic modelling study

Znanstveni rad - Sažetak

• Naslov (hrvatski): Utjecaj mehaničke stratigrafije na deformacijski stil u središnjem dijelu Vanjskih Dinarida: studija kinematskim 2D modeliranjem
• Autor: Philipp Balling https://orcid.org/0000-0002-8439-6369
• Autor: Bruno Tomljenović
• Autor: Kamil Ustaszewski https://orcid.org/0000-0002-1642-5842
• Autorova ustanova: Sveučilište u Zagrebu; Rudarsko-geološko-naftni fakultet; (Zavod za geologiju i geološko inženjerstvo)
• Znanstveno / umjetničko područje, polje i grana: PRIRODNE ZNANOSTI; Geologija

Sažetak (engleski)

The External Dinarides fold-thrust belt formed during Mid-Eocene – Oligocene times by SW-propagating thrusting from the Internal Dinarides towards the Adriatic foreland. Although previously considered as structurally quite uniform, recent work of BALLING et al. (2021) reported along-strike contrasting deformation styles in two structural domains within this fold-thrust belt. The two structural domains with very contrasting deformation styles are separated by the N-S-striking dextral Split–Karlovac Fault, a 250 km long, transpressive transfer fault. The southeastern domain is characterized by a thin-skinned SW-vergent nappe stack in contrast to the northwestern domain, where a set of blind, thick-skinned top-SW thrust duplexes prevail underneath the passive NE-vergent backthrusts. To better understand possible causes that controlled these contrasting along-strike deformation styles, we firstly analysed a spatial-temporal along- and across-strike distribution of Paleo-Mesozoic lithofacies to both sides of the Split-Karlovac Fault. We further estimated the role of mechanical stratigraphy on deformation styles in this part of the fold-thrust belt. This analysis was used to construct a new 2D kinematic forward model across the northwestern backthrust-dominated domain. Our best-fit forward-modelled balanced cross section traversing the central Velebit Mtn. portrays a 75 km wide triangle zone. This zone took up at least 47 km of shortening during Eo-Oligocene times. It comprises a set of thin-skinned NE-vergent backthrusts detached in the upper Paleozoic basement atop a SW-vergent thickskinned antiformal stack detached in the lower Paleozoic Adriatic basement. The NE-vergent backthrusts likely nucleated at lateral facies boundaries related to extensional half grabens that locally formed during Permian to Middle Triassic and Late Jurassic phases of a passive margin extension. During the Eo-Oligocene shortening, the selective inversion of inherited Mesozoic half grabens boundary faults into the NE-vergent backthrusts in the northwestern domain led to the observed along-strike changes in the deformation style of the External Dinarides. Thus, our results indicate that both the variations in the mechanical stratigraphy and the pre-orogenic structural inheritance obtained during rifting and passive margin stages exert control on Eocene–Oligocene contractional structures within the central part of the External Dinarides.

• Ključne riječi (engleski): mechanical stratigraphy; 2D kinematic modelling; Velebit Mt.; Dinarides
• Jezik: engleski
• Vrsta publikacije: Znanstveni rad - Sažetak
• Status objave: Objavljen
• Vrsta recenzije: Recenziran - međunarodna recenzija
• Verzija publikacije: Objavljena verzija rada (izdavačev PDF)
• Naslov zbornika: Knjiga sažetaka = Book of abstracts / 7. hrvatski geološki kongres s međunarodnim sudjelovanjem
• Brojčani podaci: str. 15
• p-ISSN: 1849-7713
• URN:NBN: urn:nbn:hr:169:813049
• Datum objave publikacije: 2023
• Skup: Naziv: 7. hrvatski geološki kongres s međunarodnim sudjelovanjem; Kratica: HGK; Lokacija: Poreč, Hrvatska; Organizator: Hrvatsko geološko društvo; Organizator: Hrvatski geološki institut; Organizator: Sveučilište u Zagrebu, Prirodoslovno-matematički fakultet; Organizator: Sveučilište u Zagrebu, Rudarsko-geološko-naftni fakultet; Organizator: INA – Industrija nafte d.d.; Organizator: Hrvatski prirodoslovni muzej; Organizator: Sveučilište u Zagrebu, Geotehnički fakultet Varaždin; Organizator: Agencija za ugljikovodike; Datum početka: 2023-10-02; Datum završetka: 2023-10-04; Vrsta izlaganja: Predavanje
• URL dokumenta: https://7hgk2023.hgi-cgs.hr/wp-content/uploads/2023/09/7.-HGK-book-of-abstracts.pdf
• Vrsta resursa: Tekst
• Izdavač: Hrvatski geološki institut
• Mjesto izdavanja: Zagreb
• Prava pristupa: Otvoreni pristup
• Datum i vrijeme pohrane: 2023-10-27 10:27:23