taking zonal anisotropy into account in gstat

You can "fake" it with a geometrically anisotropic model that has a very
large range in the direction where you want it to disappear, as in:

library(sp)
demo(meuse,ask=FALSE,echo=FALSE)
library(gstat)
v = variogram(log(zinc)~1, meuse, alpha = c(0,45,90,135))
vm = vgm(.25, "Sph", 1000, anis = c(45, 0.5))
plot(v, vm, main = "geometric")
zonal = vgm(.5, "Sph", 1e9, anis = c(45, 1/1e6))
# range is 1e9, effectively infinity, in 45 direction;
# it is 1e9/1e6 = 1000 in 135 direction.
vm = vgm(.25, "Sph", 1000, add.to = zonal)
plot(v, vm, main = "zonal")

taking zonal anisotropy into account in gstat

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