{"title":"Morphology and sedimentology of the Rooskagh Esker, Co. Roscommon","authors":"C. Delaney","doi":"10.3318/IRISJEARTSCIE.2019.05","DOIUrl":null,"url":null,"abstract":"Abstract:Morphological and sedimentological investigations of the Rooskagh Esker, Co. Roscommon, indicate that there is a link between esker morphology and depositional environment. Sharp-crested ridges are underlain by glaciofluvial sediments laid down in subglacial tunnels and unroofed channels. Flat-topped segments are deltas, while fan-shaped areas are underlain by subaqueous outwash fans. Variation in morphology indicates that the esker is formed from repeated tunnel-to-ice-margin sections and is time-transgressive, indicating that the ice-marginal zone was characterised by stagnation zone retreat northward. The ice margin terminated in a proglacial lake.","PeriodicalId":35911,"journal":{"name":"Irish Journal of Earth Sciences","volume":" ","pages":"-"},"PeriodicalIF":0.0000,"publicationDate":"2022-01-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":"9","resultStr":null,"platform":"Semanticscholar","paperid":null,"PeriodicalName":"Irish Journal of Earth Sciences","FirstCategoryId":"1085","ListUrlMain":"https://doi.org/10.3318/IRISJEARTSCIE.2019.05","RegionNum":0,"RegionCategory":null,"ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":null,"EPubDate":"","PubModel":"","JCR":"Q4","JCRName":"Earth and Planetary Sciences","Score":null,"Total":0}
引用次数: 9
Abstract
Abstract:Morphological and sedimentological investigations of the Rooskagh Esker, Co. Roscommon, indicate that there is a link between esker morphology and depositional environment. Sharp-crested ridges are underlain by glaciofluvial sediments laid down in subglacial tunnels and unroofed channels. Flat-topped segments are deltas, while fan-shaped areas are underlain by subaqueous outwash fans. Variation in morphology indicates that the esker is formed from repeated tunnel-to-ice-margin sections and is time-transgressive, indicating that the ice-marginal zone was characterised by stagnation zone retreat northward. The ice margin terminated in a proglacial lake.
摘要Roscommon地区Rooskagh Esker, Co.的形态和沉积学研究表明，Esker的形态与沉积环境之间存在联系。在冰下隧道和无顶河道中沉积的冰川河流沉积物下，有尖锐的峰顶山脊。平顶的部分是三角洲，而扇形的区域是水下的冲积扇。形态上的变化表明，该凹陷是由重复的隧道-冰缘剖面形成的，具有时间海侵性，表明冰缘带具有向北退缩的滞止带特征。冰缘的尽头是一个前冰期湖泊。
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