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- W2001889766 abstract "The Middle to Upper Ordovician siliciclastic succession in Central Bolivia provides excellent exposures of up to 1 m thick massive sandstone beds produced by liquefaction-induced sediment remobilisation. These fine-grained massive sandstones occur in shallow-marine nearshore facies that were deposited above storm wave base. Vertical to steeply inclined clastic dykes, which penetrate up to 1.5 m of the overlying sediment pile, feed into the basal parts of massive sandstone sheets. These dykes are interpreted as pathways used by liquefied sediment during upward-directed escape from a subsurface horizon. The relatively short lateral spacing of 5 to 25 m between the individual dykes initiated lateral coalescence of ejected individual sediment bodies. As a result, massive sandstone sheets formed and can be traced laterally over several kilometres. While undeformed sandy deposits contain between 5 to 10% dispersed clay the average clay content in massive sandstone sheets is ∼ 15%. The elongated, sometimes S-shaped form of the sandy, laminated fragments reflects squeezing during movement showing that they have been deformed under shear stress during flow. The axis of maximum elongation of the fragments indicates local flow direction. As the massive sandstone sheets are likely the products of seismic shocks they provide the first evidence of tectonic activity in this part of the basin during the Middle to Late Ordovician." @default.
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- W2001889766 date "2007-12-01" @default.
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- W2001889766 title "Shallow-marine massive sandstone sheets as indicators of palaeoseismic liquefaction — An example from the Ordovician shelf of Central Bolivia" @default.
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- W2001889766 doi "https://doi.org/10.1016/j.sedgeo.2007.04.009" @default.
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