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We present a detailed spectroscopic analysis of horizontal branch stars inthe globular cluster NGC 3201. We collected optical (4580-5330 A), highresolution (~34,000), high signal-to-noise ratio (~200) spectra for eleven RRLyrae stars and one red horizontal branch star with the multifiber spectrographM2FS at the 6.5m Magellan telescope at the Las Campanas Observatory. Frommeasured equivalent widths we derived atmospheric parameters and abundanceratios for {\alpha} (Mg, Ca, Ti), iron peak (Sc, Cr, Ni, Zn) and s-process (Y)elements. We found that NGC 3201 is a homogeneous, mono-metallic ([Fe/H]=-1.47+- 0.04), {\alpha}-enhanced ([{\alpha}/Fe]=0.37 +- 0.04) cluster. The relativeabundances of the iron peak and s-process elements were found to be consistentwith solar values. In comparison with other large stellar samples, NGC 3201 RRLyraes have similar chemical enrichment histories as do those of other old(t>10 Gyr) Halo components (globular clusters, red giants, blue and redhorizontal branch stars, RR Lyraes). We also provided a new average radialvelocity estimate for NGC 3201 by using a template velocity curve to overcomethe limit of single epoch measurements of variable stars: Vrad=494 +- 2 kms-1({\sigma}=8 km s-1).

Chemical Compositions of Field and Globular Cluster RR Lyrae Stars: I. NGC 3201