| 释义 | tar sand
 tar sandn. often tar sands A type of oil sand from which the lighter fractions of petroleum have escaped and in which only the heavier fractions forming a residual asphalt remain.tar sandn  (Geological Science) a sandstone in which hydrocarbons have been trapped; the lighter compounds evaporate, leaving a residue of asphalt in the rock porestar sand
 tar sand[′tär ‚sand]  (geology) A type of oil sand; a sand whose interstices are filled with asphalt that remained after the escape of the lighter fractions of crude oil. |