Sedimentary imprints of former ice-sheet margins: Insights from an end-Ordovician archive (SW Libya)

Girard, Flavia; Ghienne, Jean‐François; Du-Bernard, Xavier; Rubino, Jean‐Loup

doi:10.1016/j.earscirev.2015.06.006

Cited by 32 publications

(43 citation statements)

References 242 publications

(421 reference statements)

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“…Gilbert-type ice-marginal deltas commonly reflect a relatively stable position of the ice-margin in front of mountain ranges or bedrock highs that acted as pinning points (Powell 1990;Ashley 1995;Lønne 1995;Winsemann et al 2007Winsemann et al , 2011Girard et al 2015). If the ice terminus remains stable for a longer period of time, grounding line fans may also aggrade to lake level and form an ice-contact/glacifluvial delta (Powell 1990;Lønne 1995).…”

Section: Delta Styles and Depositional Processesmentioning

confidence: 99%

“…Related bedforms on the delta slope include deposits of antidunes, chutes-and-pools and cyclic steps, which might be partly misinterpreted as scour fills or waveinduced hummocky cross-stratification (cf. Deposits of supercritical density flows may record high-magnitude (glacial) floods (Ghienne et al 2010;Winsemann et al 2011;Girard et al 2012Girard et al , 2015Carling 2013;Ventra et al 2015) or represent delta slope failure events producing slides, slumps, debrisflows and/or turbidity currents (Talling 2014;Dietrich et al 2016;Hughes Clarke 2016). Deposits of supercritical density flows may record high-magnitude (glacial) floods (Ghienne et al 2010;Winsemann et al 2011;Girard et al 2012Girard et al , 2015Carling 2013;Ventra et al 2015) or represent delta slope failure events producing slides, slumps, debrisflows and/or turbidity currents (Talling 2014;Dietrich et al 2016;Hughes Clarke 2016).…”

Section: Delta Styles and Depositional Processesmentioning

confidence: 99%

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Ice‐marginal forced regressive deltas in glacial lake basins: geomorphology, facies variability and large‐scale depositional architecture

Winsemann

Lang

Polom

et al. 2018

Boreas

130

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Brandes, C. 2018 (October): Ice-marginal forced regressive deltas in glacial lake basins: geomorphology, facies variability and large-scale depositional architecture.This study presents a synthesis of the geomorphology, facies variability and depositional architecture of ice-marginal deltas affected by rapid lake-level change. The integration of digital elevation models, outcrop, borehole, groundpenetrating radar and high-resolution shear-wave seismic data allows for a comprehensive analysis of these delta systems and provides information about the distinct types of deltaic facies and geometries generated under different lake-level trends. The exposed delta sediments record mainly the phase of maximum lake level and subsequent lake drainage. The stair-stepped profiles of the delta systems reflect the progressive basinward lobe deposition during forced regression when the lakes successively drained. Depending on the rate and magnitude of lake-level fall, fanshaped, lobate or more digitate tongue-like delta morphologies developed. Deposits of the stair-stepped transgressive delta bodies are buried, downlapped and onlapped by the younger forced regressive deposits. The delta styles comprise both Gilbert-type deltas and shoal-water deltas. The sedimentary facies of the steep Gilberttype delta foresets include a wide range of gravity-flow deposits. Delta deposits of the forced-regressive phase are commonly dominated by coarse-grained debrisflow deposits, indicating strong upslope erosion and cannibalization of older delta deposits. Deposits of supercritical turbidity currents are particularly common in sand-rich Gilbert-type deltas that formed during slow rises in lake level and during highstands. Foreset beds consist typically of laterally and vertically stacked deposits of antidunes and cyclic steps. The trigger mechanisms for these supercritical turbidity currents were both hyperpycnal meltwater flows and slope-failure events. Shoal-water deltas formed at low water depths during both low rates of lake-level rise and forced regression. Deposition occurred from tractional flows. Transgressive mouthbars form laterally extensive sand-rich delta bodies with a digitate, multi-tongue morphology. In contrast, forced regressive gravelly shoal-water deltas show a high dispersion of flow directions and form laterally overlapping delta lobes. Deformation structures in the forced-regressive ice-marginal deltas are mainly extensional features, including normal faults, small graben or half-graben structures and shear-deformation bands, which are related to gravitational delta tectonics, postglacial faulting during glacial-isostatic adjustment, and crestal collapse above salt domes. A neotectonic component cannot be ruled out in some cases. facies and the larger-scale depositional architecture. The results are compared with other marine and lacustrine delta examples from the literature, and provide information about the distinct types

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Section: Delta Styles and Depositional Processesmentioning

confidence: 99%

Section: Delta Styles and Depositional Processesmentioning

confidence: 99%

Ice‐marginal forced regressive deltas in glacial lake basins: geomorphology, facies variability and large‐scale depositional architecture

Winsemann

Lang

Polom

et al. 2018

Boreas

130

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“…Girard et al, 2012), Australia (e.g. Goodsell et al, 2005) and Antarctica (e.g. Margerison et al, 2005), and extreme outburst floods are also thought to shape the landscape of Mars (e.g.…”

Section: Citations and Referencesmentioning

confidence: 99%

“…3.2.1), (ii) geographies (Jackson, 1979). c The highest number of references cited by one item (Girard et al, 2015). d The highest number of citations obtained by one item by the end of 2016 (Hemming, 2004 GLOF research has been published under 256 diverse source titles (journals and proceedings) indexed in the WOS, of which 26 journals/proceedings have published 10+ GLOF research items each (515 items in total; 57.7 %) and 10 journals/proceedings have published 20+ items each (297 items in total; 33.3 %).…”

Section: Data Processing Database Building and Analysismentioning

confidence: 99%

GLOFs in the WOS: bibliometrics, geographies and global trends of research on glacial lake outburst floods (Web of Science, 1979–2016)

Emmer

2018

Nat. Hazards Earth Syst. Sci.

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Abstract. Research on glacial lake outburst floods (GLOFs) -specific low-frequency, high-magnitude floods originating in glacial lakes, including jökulhlaups -is well justified in the context of glacier ice loss and glacial lake evolution in glacierized areas all over the world. Increasing GLOF research activities, which are documented by the increasing number of published research items, have been observed in the past few decades; however, comprehensive insight into the GLOF research community, its global bibliometrics, geographies and trends in research is missing. To fill this gap, a set of 892 GLOF research items published in the Web of Science database covering the period 1979-2016 was analysed. General bibliometric characteristics, citations and references were analysed, revealing a certain change in the publishing paradigm over time. Furthermore, the global geographies of research on GLOFs were studied, focusing on (i) where GLOFs are studied, (ii) who studies GLOFs, (iii) the export of research on GLOFs and (iv) international collaboration. The observed trends and links to the challenges ahead are discussed and placed in a broader context.

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“…A trend in the internationalization of GLOF research teams has also been observed in the past few decades (see 3.2.4), which is in line with the general trends observed (e.g., Jappe, 2007). Manually assigned bilateral research ties (each tie represents one joint publication between two countries) A matrix of 468 bilateral research ties * institutions / institutions-enhanced ** the first GLOF research item published in the WOS database (Jackson, 1979) *** the highest number of references cited by one item (Girard et al, 2015) **** the highest number of citations obtained by one item by the end of 2016 (Hemming, 2004) Nat. Hazards Earth Syst.…”

Section: Trends In Geographies 20mentioning

confidence: 50%

GLOFs in the WOS: bibliometrics, geographies and global trends of research of glacial lake outburst floods (Web of Science, 1979–2016)

Emmer¹

2017

Preprint

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Abstract.Research of glacial lake outburst floods (GLOFs) -specific low frequency, high magnitude floods originating in glacial lakes, including jokulhlaups -is well justified in the context of glacier ice loss and glacial lake evolution in glacierised areas all over the world. Increasing GLOF research activities, which are documented by the increasing number of published research items, have been observed in the past few decades; however, a comprehensive insight into the GLOF research community, its global bibliometrics, geographies and trends in research is missing. To fill this gap, a set of 892 GLOF research 10 items published in the Web of Science database covering the period 1979-2016 was analysed. General bibliometric characteristics, citations and references were analysed, revealing a certain change in the publishing paradigm over time.Furthermore, the global geographies of research on GLOFs were studied, focusing on: (i) where GLOFs are studied; (ii) who studies GLOFs; (iii) the export of research on GLOFs; and (iv) international collaboration. The observed trends are discussed and placed in a broader context. 15

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Sedimentary imprints of former ice-sheet margins: Insights from an end-Ordovician archive (SW Libya)

Cited by 32 publications

References 242 publications

Ice‐marginal forced regressive deltas in glacial lake basins: geomorphology, facies variability and large‐scale depositional architecture

Ice‐marginal forced regressive deltas in glacial lake basins: geomorphology, facies variability and large‐scale depositional architecture

GLOFs in the WOS: bibliometrics, geographies and global trends of research on glacial lake outburst floods (Web of Science, 1979–2016)

GLOFs in the WOS: bibliometrics, geographies and global trends of research of glacial lake outburst floods (Web of Science, 1979–2016)

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