Professor LIN Yangting and his team research Grove Mountains (GRV) 020090, which is an enriched lherzolitic shergottite, distinct from other lherzolitic shergottites, except RBT 04262/1.   

They propose that the primordial parent magma of GRV 020090 was derived from a moderately depleted Martian upper mantle reservoir, and later the residual melt was contaminated by oxidized and enriched Martian crustal materials as it ascended up to the subsurface. GRV 020090 and RBT 04262/1 may have sampled an igneous unit different from other lherzolitic shergottites. 

Fig.1. The photo of Martian meteorite GRV 020090. (Image by LIN) 

Fig.2. The REE patterns of magma in GRV 020090. (Image by LIN)   

Lin et al. Grove Mountains 020090 enriched lherzolitic shergottites: A two-stage formation model. Meteoritics & Planetary Science, 2013, 48: 1572-1589  （Download Here）