Los Angeles: The most differentiated basaltic martian meteorite

The evolution of a heterogeneous Martian mantle: Clues from K, P, Ti, Cr, and Ni variations in Gusev basalts and shergottite meteorites

“…This is well illustrated in a comparison of the basaltic shergottite meteorites, representing two extremes in the range in trace elements QUE 94201 (Warren et al, 1996;Kring et al, 2003) and Los Angeles (Rubin et al, 2000). The two have generally similar major element compositions (Fig.…”

“…Shergottites are typically coarse-grained and contain cumulate pyroxene, chromite, and olivine. Magnesium numbers (Mg#, defined as the atomic ratio of 100 × Mg/(Mg + Fe)) are an index of magma differentiation and are variable for basaltic shergottites, ranging from 23.8 (Los Angeles; Rubin et al, 2000) to 56.2 (Zagami; Treiman et al, 1986). A basaltic melt in equilibrium with the WD mantle olivine (Fo 76 ; Bertka and Fei, 1997) would have Mg# ≈ 48, assuming Fe and Mg partitioning (K D ) of 0.30 (Roeder and Emslie, 1970).…”

“…F) TiO 2 vs. MgO. Data are from Anand et al (2008), Dreibus et al (2000Dreibus et al ( , 2002, Gellert et al (2006), Gillet et al (2005), Ikeda et al (2006), Jambon et al (2002), , Neal et al (2001), Rubin et al (2000), Shirai and Ebihara (2004), Taylor et al (2002), Treiman et al (1986), Warren et al (1996Warren et al ( , 1999. .…”

Isotopic links between atmospheric chemistry and the deep sulphur cycle on Mars

“…Because MIF sulphur signatures are not produced by magmatic processes, these observations suggest that sulphur was fractionated by ultraviolet photochemistry in the Martian atmosphere 5,6 , deposited onto the surface and ultimately assimilated into melts, where it was reduced and incorporated into igneous sulphides. NWA 2990, NWA 5960 and Los Angeles also exhibit trace element and radiogenic isotopic characteristics that some workers have interpreted to indicate incorporation of crustal material [14][15][16][17] . The coincidence of anomalous sulphide with other geochemical characteristics, including evidence for crystallization under relatively oxidizing conditions [14][15][16][17] , suggests a link between anomalous sulphur in igneous minerals and assimilation of crustal material into the melts.…”

Astrophysics in 2001

“…And, while we're on organics and Martian meteorites, Jull et al (2000) have interpreted the supply in Nakhla as demonstrating that comet debris have accumulated on Mars. The Los Angeles meteorite is also from Mars (Rubin et al 2000), and if you say you already knew that, the Angelena author will be offended.…”