Geochemical element mobilisation by interaction of Bowland shale with acidic fluids

•Bowland shale end members are reacted with simulated hydraulic fracturing fluids.•Higher fluid acidity and temperature enhance mobilisation of most elements.•Higher rock/fluid ratio increases buffering capacity.•Fluid pH buffering favours immobilisation of Al, Mn, Fe, Pb, Ba.•Sr mobilisation is controlled by calcite dissolution, and As by pyrite dissolution.