Late Ordovician deglaciation of the Murzuq Basin (SW Libya): a core to seismic-scale characterization of the depositional environments and sedimentary architecture

Bataller, F.J.; McDougall, Neil; Moscariello, Andrea; Gil-Ortiz, Marc; Paula, B. Cavalcanti de

doi:10.1016/j.marpetgeo.2021.105335

Cited by 6 publications

(2 citation statements)

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“…The ~40 m thick braidplain we identify in proximal regions of Skeiðarársandur (e.g Fig. 6) may be attributed to a glaciofluvial delta topset that has formed as a response to rapid glacier recession (Lønne, 1995; Tuttle et al ., 1997; Bataller et al ., 2021). Given the lack of basal contact within any of the radargrams it is difficult to establish the absolute thickness of this radar unit.…”

Section: Discussionmentioning

confidence: 99%

“…Despite considerable research (e.g. Krigström, 1962; Church, 1972, 1973; Boothroyd and Ashley, 1975; Boothroyd and Nummedal, 1978; Maizels, 1991, 1993a, b; Gomez et al ., 2000; Marren, 2002a, b, 2005; Zieliński and van Loon, 2002, 2003; Salamon and Zieliński, 2010; Marren and Toomath, 2013; Flindt et al ., 2018; Bataller et al ., 2021; Lang et al ., 2021; Mleczak and Pisarska‐Jamroży, 2021; Weckwerth et al ., 2021), the main factors that influence sandar development and evolution alongside glaciation and rapid deglaciation, and their impact upon the large‐scale sediment architecture of sandar environments, remains to be established. Attempts to characterise the variability of the sandar subsurface are often fraught as a result of limited sedimentary exposures that do not provide enough vertical or spatial coverage.…”

Section: Introductionmentioning

confidence: 99%

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Geophysical reconstruction of the late Holocene proximal proglacial landsystem at Skeiðarársandur, southeast Iceland

Harrison

Ross

Russell

et al. 2023

J Quaternary Science

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Sandur plains are extensive sedimentary bodies formed in proglacial settings by glaciofluvial processes. Icelandic sandar have been hypothesised to be comprised of thick alluvial successions that provide critical insight into the processes that contributed to their formation and evolution. However, to‐date, most sandar research has focused on the analysis of sedimentary successions associated to topographically‐confined and small‐scale systems. These, however, do not capture the variety or scale of processes that influence sandar architecture. Therefore, detailed subsurface analysis of large‐scale and unconfined sandar is vital to understand how these systems respond to fundamental drivers, such as: (i) glacier oscillations, and (ii) episodic sediment flux from glacier outburst floods (aka. jökulhlaups). We report an extensive, low‐frequency (40 & 100 MHz) ground‐penetrating radar (GPR) survey of the ice‐proximal component of a large‐scale (~ 13000.25em km 2 $\unicode{x0007E}1300\,{\text{km}}^{2}$) active sandur in southeast Iceland. A bright and continuous reflection (PR1) is identified within all radargrams and provides a boundary between pre‐LIA and LIA to present‐day sedimentation. GPR data reveals a ~50 m thick ice‐proximal sediment wedge that is attributed to jökulhlaup and surge‐related glaciofluvial activity during the Little Ice Age (LIA). An approximate rate of deposition of 0.2–0.65 m a− 1 ${{\rm{a}}}^{-1}$ has been calculated for the sediment wedge above PR1. Furthermore, we propose an extensive, sandur‐wide, pre‐LIA ice marginal limit of Skeiðarárökull, southeast Iceland, based on observations reported here and in previous work.

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Section: Discussionmentioning

confidence: 99%