Rapid subglacial streamlined bedform formation at a calving bay margin

التفاصيل البيبلوغرافية
العنوان: Rapid subglacial streamlined bedform formation at a calving bay margin
المؤلفون: Thomas P. F. Dowling, Per Möller, Matteo Spagnolo
المصدر: Journal of Quaternary Science. 31:e2912
بيانات النشر: Wiley, 2016.
سنة النشر: 2016
مصطلحات موضوعية: geography, geography.geographical_feature_category, Bedform, 010504 meteorology & atmospheric sciences, Drumlin, Paleontology, 010502 geochemistry & geophysics, 01 natural sciences, Arts and Humanities (miscellaneous), Moraine, Margin (machine learning), Earth and Planetary Sciences (miscellaneous), Deglaciation, Glacial period, Ice sheet, Geomorphology, Bay, Geology, 0105 earth and related environmental sciences
الوصف: Using the LiDAR-derived Swedish national height model we have identified previously undescribed shallow streamlined glacial bedforms, small-scale drumlins, on the Narke plain in south-central Sweden. These drumlins could only be detected with high-resolution LiDAR, due to both their subtle size and forest cover. In this area the ice margin receded in a subaqueous environment with a proglacial water depth in the order of 100 m during the last deglaciation. As indicated by the configuration of marginally formed De Geer moraine ridges draping the drumlinoids, the receding ice margin formed deeply indented calving bays. These were located around subaqueous outlets of the subglacial melt-water drainage, with their apex position marked geomorphologically by beaded esker ridges. The mapped small-scale drumlins are aligned perpendicular to the reconstructed ice sheet margin and suggest formation along flow lines adjusted to the configuration of these calving embayments as they propagated up-flow with ice margin retreat. Based on these geometric relationships we argue that the emplacement of the drumlins was near-marginal, ∼7.7–1 km from the margin, on a short timescale (∼5–35 years). (Less)
تدمد: 0267-8179
DOI: 10.1002/jqs.2912
URL الوصول: https://explore.openaire.eu/search/publication?articleId=doi_________::9278fd701eff048276e0b0332dad092f
https://doi.org/10.1002/jqs.2912
Rights: OPEN
رقم الانضمام: edsair.doi...........9278fd701eff048276e0b0332dad092f
قاعدة البيانات: OpenAIRE
الوصف
تدمد:02678179
DOI:10.1002/jqs.2912