Rediscovering the origins of the stellar halo with chemical tagging
  The Galactic halo has a complex assembly history, which can be seen in its
wealth of kinematic and chemical substructure. Globular clusters lose stars
through tidal interactions with the Galaxy and cluster evaporation processes,
meaning that they are inevitably a source of halo stars. These "migrants" from
globular clusters can be recognized in the halo field by the characteristic
light element abundance anticorrelations that are commonly observed only in
globular cluster stars, and the number of halo stars that can be chemically
tagged to globular clusters can be used to place limits on the formation
pathways of those clusters.
