10Be exposure ages of erratic boulders in southern Norway and implications for the history of the Fennoscandian Ice Sheet Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/df65vc074

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  • A progressive and large divergence between boulder and bedrock exposure ages is observed at the easternmost site (Elgåhogna), indicating that the bedrock has experienced minimal erosion under cold-based ice. Therefore, blockfields are not young features (< ~10 kyr), but rather have survived beneath regions of coldbased ice, possibly through multiple glacial-interglacial cycles.
  • This thesis focuses on the application of the cosmogenic nuclide Beryllium-10 (10Be) in an effort to better constrain the thickness history of the Fennoscandian Ice Sheet (FIS) at the Last Glacial Maximum (LGM) and into the Holocene, as well as begin to answer the long-standing question regarding the age and interpretation of periglacial weathering features in southern Norway. 10Be exposure ages of glacially transported boulders have been measured along three vertical transects (Skåla, Blåhø, and Elgåhogna) in southern Norway. At the LGM, 10Be ages indicate that ice at Blåhø and Elgåhogna was thicker than that based on reconstructions using blockfield-weathering limits, and better agrees with models based on ice physics or isostatic rebound inversion. Ice surface elevation at Skåla was likely no greater than ~1440 m at the LGM, agreeing well with the mapped trimline in that region, as well as high resolution models for Nordfjord. At all three sites, rapid deglaciation begins at approximately 12 10Be ka, and deglaciation is complete by approximately 9 10Be ka.
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