J 2020

Synchrony evolution of two contradictory prograding Gilbert-type deltas at the margins of the foreland basin (case study from the Neogene Western Carpathian Foredeep)

BLAŠKO, David and Slavomír NEHYBA

Basic information

Original name

Synchrony evolution of two contradictory prograding Gilbert-type deltas at the margins of the foreland basin (case study from the Neogene Western Carpathian Foredeep)

Authors

BLAŠKO, David (203 Czech Republic, belonging to the institution) and Slavomír NEHYBA (203 Czech Republic, guarantor, belonging to the institution)

Edition

Marine and Petroleum Geology, Elsevier SCI LTD, 2020, 0264-8172

Other information

Language

English

Type of outcome

Article in a journal

Field of Study

10505 Geology

Country of publisher

Netherlands

Confidentiality degree

is not subject to a state or trade secret

References:

Impact factor

Impact factor: 4.348

RIV identification code

RIV/00216224:14310/20:00115631

Organization unit

Faculty of Science

UT WoS

000537736900011

EID Scopus

2-s2.0-85084434525

Keywords in English

Seismic stratigraphy; sequence stratigraphy; Gilbert-type delta evolution; ruling factors; eustatic sea-level changes vs. fault tectonic activity

Tags

Tags

International impact, Reviewed
Changed: 14/9/2020 09:34, Mgr. Marie Novosadová Šípková, DiS.

Abstract

In the original language

The study concerns about two Miocene deltas located along the opposite margins of the Western Carpathian Foredeep (peripheral foreland basin), their architecture and evolution. Three synchrony phases of development of the Gilbert-type deltas were recognized based on 3D and 2D seismic data, well logs and cores. Individual phases are separated by seismic stratigraphy surfaces. The base of the deltas is formed by the erosional discontinuity (seismic stratigraphy surface 1), which is the sequence boundary of the 3rd order cycle. During the first phase, the sediment supply exceeds accommodation space creation and progradation of deltas and the normal regression regime dominates. The first phase is terminated by the maximum regressive surface/transgressive surface (seismic stratigraphy surface 2) and interpreted as the lowstand systems tract. In the second phase, the aggradation and retrogradation regime of deltas reveals the acceleration of the accommodation space creation and the deposits are interpreted as the transgressive systems tract. The third phase is bounded by the maximum flooding surface (seismic stratigraphy surface 3) and shows progradation of the delta in the normal regression regime, then the sediment supply exceeds the accommodation space. The maximum regressive surface (seismic stratigraphy surface 4) terminates this phase and allows to interpret it as the highstand systems tract. The synchrony evolution of deltas is explained by the tectonic activity along the fault system oriented perpendicular to the basin axis. Position of the deltas is also responsible for continuous sediment supply and its variations. The tectonic activity of the transverse fault system across the entire basin hidden the signals of the reciprocal activity of the opposite basin margins directed by flexural tectonics.