  We theoretically study the superconducting proximity effect in silicene,
which features massive Dirac fermions with a tunable mass (band gap), and
compute the conductance across a normal/superconductor (N/S) silicene junction,
the non-local conductance of an N/S/N junction, and the supercurrent flowing in
an S/N/S junction. It is demonstrated that the transport processes consisting
of local and non-local Andreev reflection may be efficiently controlled via an
external electric field owing to the buckled structure of silicene. In
particular, we demonstrate that it is possible to obtain a fully spin-valley
polarized crossed Andreev reflection process without any contamination of
elastic cotunneling or local Andreev reflection, in stark contrast to ordinary
metals. It is also shown that the supercurrent flowing in the S/N/S junction
can be fully spin-valley polarized and that it is controllable by an external
electric field.
