Dating glacial sediments
Plant remains buried under retreating glaciers in East Greenland confirm that these places were not covered by glaciers until years ago. Brief conclusions of the study : Holocene glacial history of the Renland Ice Cap, East Greenland, reconstructed from lake sediments Highlights. Shrinking glaciers, melting permafrost, and shrinking sea ice indicate that the Arctic cryosphere is rapidly shrinking in dating glacial sediments to contemporary climate warming, and this trend is expected to continue, if not accelerate.
The response of the Arctic cryosphere to past periods of climate change can provide insight into its current and future behavior.
However, thin layers of bluish-gray clay throughout this period may indicate millennia of glacial expansion, with the Renland glacial cap briefly reaching a size during cold phases that may have been similar to modern times. We hypothesize that the deposition of stone chips in the lakes in the past millennium corresponded to the advance of the Renland glaciers to their Little Ice Age positions, marked by a fresh, gray demolition dating glacial sediments.
The overall pattern of ice fluctuations at Renland is similar to that at other ice caps in the region, but also has important differences, including the persistence of a possible Middle Holocene dating glacial sediments at times when ice caps at lower elevations in the Scoresby Sound region may have been absent. This finding supports the concept that several geographic and geomorphologic conditions must be examined to fully understand ice variations in the region.
Dating glacial sediments VideoGEOL 101 - #7 - Glacial Till
Dating glacial sediments - authoritative answerThe paper presents the results of a 14C dating programme the objects of which were to date a more definitively their commencement throughout the Wicklow Mountains and b their internal stratigraphies with a view to establishing a flood chronology. AMS and radiometric 14C dating techniques were applied to organic fractions and particulate organic matter extracted from thin organic-rich layers within sampled sedimentary sequences. Although these results show that the immediate research aims cannot be achieved using 14C dating they have led to a clearer understanding of the sourcing and dynamics of the modern style of sedimentation. Key index words: Floodplains, sediments, dating. Introduction The aim of this paper is to report attempts using 14C methods to date the onset of the present phase and style of floodplain sedimentation in the Wicklow Mountains and to establish an internal sedimentation chronology. Figure 1 is a synoptic section representative of the Holocene alluvial stratigraphy in the upper Liffey valley based on previous research Glanville, Thorp and Gallagher, ; Glanville, and is generally applicable to other valleys in the mountains. The modern overbank alluvia and floodplains of the rivers in the Wicklow Mountains have a very distinctive sedimentology consisting of numerous thin layers of medium sand to fine gravel the upper part of many being enriched in organic matter, Plates 1 and 2. The clastic sediments of the layers are quartz, mica and feldspars from the granite country rocks, older alluvia and glacigenic sediments. The organic component of the sediments is dominantly composed of diffuse humic material in the form of a dark grey brown colour stain on the clasts, with occasional hard nodules of peat, and minor, often microscopic, pieces of charcoal and plant debris.
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