QUARTZ WEATHERING IN FREEZE-THAW CYCLES: EXPERIMENT AND APPLICATION TO THE EL'GYGYTGYN CRATER LAKE RECORD FOR TRACING SIBERIAN PERMAFROST HISTORY


Schwamborn G. J. , Schirrmeister L., Fruetsch F., Diekmann B.

GEOGRAFISKA ANNALER SERIES A-PHYSICAL GEOGRAPHY, ss.481-499, 2012 (SCI İndekslerine Giren Dergi) identifier identifier

  • Cilt numarası: Konu: 4
  • Basım Tarihi: 2012
  • Doi Numarası: 10.1111/j.1468-0459.2012.00472.x
  • Dergi Adı: GEOGRAFISKA ANNALER SERIES A-PHYSICAL GEOGRAPHY
  • Sayfa Sayıları: ss.481-499

Özet

The object of this study is to test the assumption that cryogenic weathering (here understood as in-situ disintegration of rock under cold-climate conditions including ice as a weathering agent) preferentially breaks up quartz grains. We apply the results of laboratory tests to a Quaternary sediment record. The combination of silt production, relative quartz enrichment in the silt fraction, and quartz grain micromorphology is traced in a multi-100-kyr lake sediment archive as indicator data for cryogenic weathering. Constant cryogenic weathering conditions are inferred for at least the last 220 000 years from a lake sediment core of El'gygytgyn Crater, northeast Russia. This is the longest continuous terrestrial archive currently known for the continental Arctic.