  Fluxes of the magnetic helicity density play an important role in large-scale
turbulent dynamos, allowing the growth of large-scale magnetic fields while
overcoming catastrophic quenching. We show here, analytically, how several
important types of magnetic helicity fluxes can arise from terms involving
triple correlators of fluctuating fields in the helicity density evolution
equation. For this, we assume incompressibility and weak inhomogeneity, and use
a quasinormal closure approximation: fourth-order correlators are replaced by
products of second-order ones, and the effect of the fourth-order cumulants on
the evolution of the third moments is modelled by a strong damping term. First,
we show how a diffusive helicity flux, till now only measured in simulations,
arises from the triple correlation term. This is accompanied by what we refer
to as a `random advective flux', which predominantly transports magnetic
helicity along the gradients of the random fields. We also find that a new
helicity flux contribution, in some aspects similar to that first proposed by
Vishniac, can arise from the triple correlator. This contribution depends on
the gradients of the random magnetic and kinetic energies along the large-scale
vorticity, and thus arises in any rotating, stratified system, even if the
turbulence is predominantly nonhelical. It can source a large-scale dynamo by
itself while spatially transporting magnetic helicity within the system.
