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- Pusch, Roland, et al.
(författare)
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Origin of silty fracture fillings in crystalline bedrock
- 1990
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Ingår i: Geologiska föreningens i Stockholm förhandlingar. - : Informa UK Limited. - 0016-786X. ; 112:3, s. 209-213
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Tidskriftsartikel (refereegranskat)abstract
- Silty fillings in subhorizontal fractures of large area are occasionally found at shallow depth in Swedish bedrock. The soil was deposited after widening of the fractures due to the rock stress conditions at the edge of retreating ice sheets, a probable further implication being artesian conditions leading to hydraulic lifting. It is concluded that if the rate of ice retreat was sufficiently high, the basal part of the ice would be adfrozen to still frozen rock, and highly pressurized meltwater discharged through interconnected, steep and flat-lying fractures, which became filled with soil material transported with the water.
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