  We study Stark-Heegner cycles attached to Bianchi modular forms, that is
automorphic forms for GL(2) over an imaginary quadratic field F . The
Stark-Heegner cycles are local cohomology classes in the p-adic Galois
representation associated to the Bianchi eigenform. They are conjectured to be
the restriction (at a prime p) of global cohomology classes in the (semistable)
Bloch-Kato Selmer group defined over ring class fields of a relative quadratic
extension K/F. In this paper, we show that these conjectures hold when the
Bianchi eigenform is the base-change of a classical elliptic cuspform.
