Past and present proglacial sedimentary systems record
valuable information about critical phases of the Earth’s climatic
history. Although glacial
outburst-related sedimentation has been identified in proglacial outwash
systems, the behavior of glacial outburst flows when entering the sea are
poorly understood. Here, Girard et al. document an Upper
Ordovician proglacial sand-rich delta-front succession preserved in
southwestern Libya, exploring how the proglacial delta front responded to
sediment and meltwater discharge inputs of varying magnitude and frequency. The
observations and interpretations, consistent with Pleistocene analogs, should
be applicable to other paleoglaciations, and provide conceptual model for
studies on management and vulnerability of groundwater and the development of
glaciogenic hydrocarbon reservoirs.
Occurrence of hyperpycnal flows and hybrid event beds related to glacial outburst events in a Late Ordovician proglacial delta (Murzuq Basin, SW Libya) by Flavia Girard,
Jean-François Ghienne, and Jean-Loup Rubino
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