Variations in esker morphology and internal architecture record time-transgressive deposition during ice margin retreat in Northern Ireland

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F00216208%3A11310%2F21%3A10432918" target="_blank" >RIV/00216208:11310/21:10432918 - isvavai.cz</a>

Result on the web

<a href="https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3iim9M377Y" target="_blank" >https://verso.is.cuni.cz/pub/verso.fpl?fname=obd_publikace_handle&handle=3iim9M377Y</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.pgeola.2021.03.002" target="_blank" >10.1016/j.pgeola.2021.03.002</a>

Result language

angličtina

Original language name

Variations in esker morphology and internal architecture record time-transgressive deposition during ice margin retreat in Northern Ireland

Original language description

The architecture and evolution of the subglacial hydrological system plays a key role in modulating ice flow. Eskers provide an opportunity to understand subglacial hydrology at a broader perspective than contemporary studies. Recent research has established a morphogenetic classification for eskers, but these studies have been limited to topographically simple regions of a single ice sheet. We present an updated map of esker distribution in Northern Ireland based on 5-m resolution elevation data. We also present a high-resolution map of the glacial geomorphology of SW Northern Ireland, based on -0.4-m resolution elevation data. Ground Penetrating Radar data from four sites along the &gt;20-km long Evishanoran Esker system in central Northern Ireland are combined with geomorphological observations to provide insight into depositional processes and controls on esker formation. Esker architecture indicates two styles of deposition, including an initial high energy flow event in a subglacial conduit and delta foreset deposition close to the ice sheet margin during ice margin retreat. These delta foresee deposits can be used to reconstruct former ice margins. We identify that local topographic complexity and geological structures (e.g., faults) are important controls on esker formation. The broad-scale esker architecture remains the same despite variable esker planform morphology, suggesting hydrological conditions alone cannot explain esker morphology. This study provides further evidence that morphogenetic relationships cannot be based solely on remote sensing data and must be supported by robust field observations, especially where post-glacial processes may distort esker morphology (e.g., pear infilling). Crown Copyright (C) 2021 Published by Elsevier Ltd on behalf of The Geologist Association. All rights reserved.

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

10508 - Physical geography

Project

—

Continuities

S - Specificky vyzkum na vysokych skolach<br>I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace

Publication year

2021

Confidentiality

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

Name of the periodical

Proceedings of the Geologists&apos; Association

ISSN

0016-7878

e-ISSN

—

Volume of the periodical

132

Issue of the periodical within the volume

4

Country of publishing house

GB - UNITED KINGDOM

Number of pages

17

Pages from-to

409-425

UT code for WoS article

000695697100001

EID of the result in the Scopus database

2-s2.0-85104668681