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Our study is a follow-up of the SACY project, an extended survey in theSouthern Hemisphere targeted to search for young nearby associations. Nineassociations have either been newly identified, or had their member list betterdefined. These associations, with ages between about 6 Myr and 70 Myr, form anexcellent sample to study the Li depletion in the pre-main sequence (PMS)evolution. We investigate the use of Li abundances as an independent clock toconstrain the PMS evolution. We have calculated the LTE Li abundances for 376members of different young associations. In addition we considered the effectsof their projected stellar rotation. We present the Li depletion as function ofage in the first hundred million years for the first time for the most extendedsample of Li abundances in young stellar associations. A clear Li depletion canbe measured in the temperature range from 5000K to 3500K for the age spancovered by these nine associations. The age sequence based on the Li-clockagrees well with the isochronal ages, $\epsilon$Cha association being the onlypossible exception. The lithium depletion patterns for those associationsresemble those of the young open clusters, strengthening the notion that themembers proposed for these loose young associations have indeed a commonphysical origin. The observed scatter in the Li abundances hampers the use ofLi to determine reliable ages for individual stars. Rotation velocities above20 km s$^{-1}$ seem to inhibit the Li depletion.

Search for associations containing young stars. III- Ages and Li abundances