Plan-form evolution of ancient meandering rivers reconstructed
from longitudinal outcrop sections

J 2014

Plan-form evolution of ancient meandering rivers reconstructed from longitudinal outcrop sections

GHINASSI, Massimiliano; Wojciech NEMEC; Mauro ALDINUCCI; Slavomír NEHYBA; Volkan ÖZAKSOY et al.

Základní údaje

Originální název

Plan-form evolution of ancient meandering rivers reconstructed from longitudinal outcrop sections

Autoři

GHINASSI, Massimiliano; Wojciech NEMEC; Mauro ALDINUCCI; Slavomír NEHYBA; Volkan ÖZAKSOY a Francesco FIDOLINI

Vydání

Sedimentology, Oxford, 2014, 0037-0746

Další údaje

Jazyk

angličtina

Typ výsledku

Článek v odborném periodiku

Obor

10500 1.5. Earth and related environmental sciences

Stát vydavatele

Spojené státy

Utajení

není předmětem státního či obchodního tajemství

Impakt faktor

Impact factor: 2.948

Označené pro přenos do RIV

Ano

Kód RIV

RIV/00216224:14310/14:00073630

Organizační jednotka

Přírodovědecká fakulta

Klíčová slova česky

Boyabat Basin;fluvial palaeochannel;meander-bend transformation;Palaeogene;point-bar architecture;thalweg trajectory;Turkey

Klíčová slova anglicky

Boyabat Basin;fluvial palaeochannel;meander-bend transformation;Palaeogene;point-bar architecture;thalweg trajectory;Turkey

Štítky

AKR, rivok

Změněno: 13. 3. 2018 12:51, prof. RNDr. Slavomír Nehyba, Dr.

Anotace

V originále

he mode of channel-bend transformation (i.e. expansion, translation, rotation or a combination thereof) has a direct bearing on the dimensions, shape, bedding architecture and connectivity of point-bar sandstone bodies within a fluvial meander belt, but is generally difficult to recognize in vertical outcrops. This study demonstrates how the bend transformation mode and relative rate of channel-floor aggradation can be deciphered from longitudinal outcrop sections aligned parallel to the meander-belt axis, as a crucial methodological aid to the reconstruction of ancient fluvial systems and the development of outcrop analogue models for fluvial petroleum reservoirs. The study focuses on single-storey and multi-storey fluvial meander-belt sandstone bodies in the Palaeogene piggyback Boyabat Basin of north-central Turkey. The sandstone bodies are several hundred metres wide, 5 to 40 m thick and encased in muddy floodplain deposits. The individual channel-belt storeys are 5 to 9 m thick and their transverse sections show lateral-accretion bed packages representing point bars. Point bars in longitudinal sections are recognizable as broad mounds whose parts with downstream-inclined, subhorizontal and upstream-inclined bedding represent, respectively, the bar downstream, central and upstream parts. The inter-bar channel thalweg is recognizable as the transition zone between adjacent point-bar bedsets with opposing dip directions into or out of the outcrop section. The diverging or converging adjacent thalweg trajectories, or a trajectory migrating in up-valley direction, indicate point-bar broadening and hence channel-bend expansion. A concurrent down-valley migration of adjacent trajectories indicates channel-bend translation. Bend rotation is recognizable from the replacement of a depositional riffle by an erosional pool zone or vice versa along the thalweg trajectory. The steepness of the thalweg trajectory reflects the relative rate of channel-floor aggradation. This study discusses further how the late-stage foreland tectonics, with its alternating pulses of uplift and subsidence and a progressive narrowing of the basin, has forced aggradation of fluvial channels and caused vertical stacking of meander belts.

Návaznosti

GA205/09/0103, projekt VaV

Název: Mělkovodní ekosystémy středního miocénu Centrální Paratethydy: Sukcese a interakce anorganické a organické složky ekosystémů

Investor: Grantová agentura ČR, Mělkovodní ekosystémy středního miocénu Centrální Paratethydy: Sukcese a interakce anorganické a organické složky ekosystémů

Citovat

GHINASSI, Massimiliano; Wojciech NEMEC; Mauro ALDINUCCI; Slavomír NEHYBA; Volkan ÖZAKSOY a Francesco FIDOLINI. Plan-form evolution of ancient meandering rivers reconstructed from longitudinal outcrop sections. Sedimentology. Oxford, 2014, roč. 61, č. 4, s. 952-977. ISSN 0037-0746. Dostupné z: https://doi.org/10.1111/sed.12081.

@article{1182781,
   author = {Ghinassi, Massimiliano and Nemec, Wojciech and Aldinucci, Mauro and Nehyba, Slavomír and Özaksoy, Volkan and Fidolini, Francesco},
   article_location = {Oxford},
   article_number = {4},
   doi = {https://doi.org/10.1111/sed.12081},
   keywords = {Boyabat Basin;fluvial palaeochannel;meander-bend transformation;Palaeogene;point-bar architecture;thalweg trajectory;Turkey},
   language = {eng},
   issn = {0037-0746},
   journal = {Sedimentology},
   title = {Plan-form evolution of ancient meandering rivers reconstructed from longitudinal outcrop sections},
   volume = {61},
   year = {2014}
}

TY  - JOUR
ID  - 1182781
AU  - Ghinassi, Massimiliano - Nemec, Wojciech - Aldinucci, Mauro - Nehyba, Slavomír - Özaksoy, Volkan - Fidolini, Francesco
PY  - 2014
TI  - Plan-form evolution of ancient meandering rivers reconstructed from longitudinal outcrop sections
JF  - Sedimentology
VL  - 61
IS  - 4
SP  - 952-977
EP  - 952-977
SN  - 00370746
KW  - Boyabat Basin;fluvial palaeochannel;meander-bend transformation;Palaeogene;point-bar architecture;thalweg trajectory;Turkey
N2  - he mode of channel-bend transformation (i.e. expansion, translation, rotation or a combination thereof) has a direct bearing on the dimensions, shape, bedding architecture and connectivity of point-bar sandstone bodies within a fluvial meander belt, but is generally difficult to recognize in vertical outcrops. This study demonstrates how the bend transformation mode and relative rate of channel-floor aggradation can be deciphered from longitudinal outcrop sections aligned parallel to the meander-belt axis, as a crucial methodological aid to the reconstruction of ancient fluvial systems and the development of outcrop analogue models for fluvial petroleum reservoirs. The study focuses on single-storey and multi-storey fluvial meander-belt sandstone bodies in the Palaeogene piggyback Boyabat Basin of north-central Turkey. The sandstone bodies are several hundred metres wide, 5 to 40 m thick and encased in muddy floodplain deposits. The individual channel-belt storeys are 5 to 9 m thick and their transverse sections show lateral-accretion bed packages representing point bars. Point bars in longitudinal sections are recognizable as broad mounds whose parts with downstream-inclined, subhorizontal and upstream-inclined bedding represent, respectively, the bar downstream, central and upstream parts. The inter-bar channel thalweg is recognizable as the transition zone between adjacent point-bar bedsets with opposing dip directions into or out of the outcrop section. The diverging or converging adjacent thalweg trajectories, or a trajectory migrating in up-valley direction, indicate point-bar broadening and hence channel-bend expansion. A concurrent down-valley migration of adjacent trajectories indicates channel-bend translation. Bend rotation is recognizable from the replacement of a depositional riffle by an erosional pool zone or vice versa along the thalweg trajectory. The steepness of the thalweg trajectory reflects the relative rate of channel-floor aggradation. This study discusses further how the late-stage foreland tectonics, with its alternating pulses of uplift and subsidence and a progressive narrowing of the basin, has forced aggradation of fluvial channels and caused vertical stacking of meander belts.
ER  -

GHINASSI, Massimiliano; Wojciech NEMEC; Mauro ALDINUCCI; Slavomír NEHYBA; Volkan ÖZAKSOY a Francesco FIDOLINI. Plan-form evolution of ancient meandering rivers reconstructed from longitudinal outcrop sections. \textit{Sedimentology}. Oxford, 2014, roč.~61, č.~4, s.~952-977. ISSN~0037-0746. Dostupné z: https://doi.org/10.1111/sed.12081.

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