Evaluation of climatic and tectonic imprints in fluvial successions of an early Permian depositional system (Asselian Vrchlabí Fm., Krkonoše Piedmont Basin, Czech Republic)

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00025798%3A_____%2F22%3A00000010" target="_blank" >RIV/00025798:_____/22:00000010 - isvavai.cz</a>

Result on the web

<a href="https://pubs.geoscienceworld.org/sepm/jsedres/article/92/3/275/612946/Evaluation-of-Climatic-and-Tectonic-Imprints-In" target="_blank" >https://pubs.geoscienceworld.org/sepm/jsedres/article/92/3/275/612946/Evaluation-of-Climatic-and-Tectonic-Imprints-In</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.2110/jsr.2020.137" target="_blank" >10.2110/jsr.2020.137</a>

Result language

angličtina

Original language name

Evaluation of climatic and tectonic imprints in fluvial successions of an early Permian depositional system (Asselian Vrchlabí Fm., Krkonoše Piedmont Basin, Czech Republic)

Original language description

The Krkonoše Piedmont Basin (KPB), an early post-Variscan basin (c. 310–280 Ma)located in the northern Czech Republic, contains up to 300 m thick non-marine lower Permian deposits in its southern-central part. The early Permian KPB exhibits striking similarities to other early Variscan, near equatorial basins in terms of tectonostratigraphic evolution. This work focuses on sedimentological analysis of the Vrchlabí Fm. (Asselian) in the SW part of the KPB. In the southern-central KPB, the formation consists of fluvio-deltaic deposits, which laterally pass into lacustrine deposits derived from lake Rudník in the northern part of the KPB. Fluvial deposits comprise sandstone and conglomeratic bodies interpreted as single- and multi-storey channel fills as well as various macroforms (e.g., bars) deposited by a braided fluvial system. Vertically, fluvial successions are divided into five different units that exhibit variable ratios between preserved channel fill and floodplain deposits (reflecting differing accommodation/supply ratio) and contrasting channel-fill geometries. In order to explain the observed changes in the fluvial style and to determine the controlling factors, the interaction of the fluvial system with the lacustrine basin was investigated by interpreting base-level changes of the fluvial system, as well as tracing horizons of lake expansion (allegedly a result of humid periods). In the central part of the KPB, the transition from fluvial to lacustrine deposits is represented by alternating grey sandstone and dark grey siltstone/mudstone beds, deposited either as mouth bars or bottomsets of lacustrine microdeltas. Detailed correlation of existing borehole data and newly acquired outcrop gamma-ray logs led to better understanding of lateral and vertical relationships between the fluvial, the ‘transitional’ and the lake facies at the basin-scale. Altough initial tectonic subsidence played a substainal role during the intialdeposition of the formatio, the observed pattern cannot be explained merely by tectonics. The external geometries and internal architecture of fluvial channel bodies, variable degree of floodplain preservation together with inferred decelerated fault subsidence indicate that changes in fluvial style through time were significantly controlled by climate variations. This study illustrates the usefulness of an interdisciplinary approach to reconstruct a basin’s early Permian stratigraphic history in a region with sparse outcrops and very limited fossil record.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10505 - Geology

Project

—

Continuities

I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2022

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Name of the periodical

Journal of Sedimentary Research

ISSN

1527-1404

e-ISSN

—

Volume of the periodical

92

Issue of the periodical within the volume

3

Country of publishing house

US - UNITED STATES

Number of pages

28

Pages from-to

275-303

UT code for WoS article

000787774000004

EID of the result in the Scopus database

2-s2.0-85131098381