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[Abridged] With the first 10000 spectra of the flux limited zCOSMOS sample(I<=22.5) we study the evolution of environmental effects on galaxy propertiessince z=1.0, and disentangle the dependence among galaxy colour, stellar massand local density (3D local density contrast `delta', computed with the 5thnearest neighbour approach). We confirm that within a luminosity-limited sample(M_B<=-20.5-z) the fraction of red (U-B>=1) galaxies 'f_red' depends on deltaat least up to z=1, with red galaxies residing mainly in high densities. Thistrend weakens for increasing z, and it is mirrored by the behaviour of thefraction of galaxies with D4000A break >=1.4. We also find that up to z=1 thefraction of galaxies with log(EW[OII]) >=1.15 is higher for lower delta, andalso this dependence weakens for increasing z. Given the triple dependenceamong galaxy colours, stellar mass and delta, the colour-delta relation foundin the luminosity-selected sample can be due to the broad range of stellarmasses. Thus, we fix the stellar mass and we find that in this case thecolour-delta relation is flat up to z=1 for galaxies with log(M/M_sun)>=10.7.This means that for these masses the colour-delta relation found in aluminosity-selected sample is the result of the combined colour-mass andmass-delta relations. In contrast, we find that for 0.1<=z<=0.5 andlog(M/M_sun)<=10.7 'f_red' depends on delta even at fixed mass. In these massand z ranges, environment affects directly also galaxy colours. We suggest ascenario in which the colour depends primarily on stellar mass, but forrelatively low mass galaxies the local density modulates this dependence. Thesegalaxies formed more recently, in an epoch when evolved structures were alreadyin place, and their longer SFH allowed environment-driven physical processes tooperate during longer periods of time.

The zCOSMOS 10k-sample: the role of galaxy stellar mass in the colour-density relation up to z=1