We present compositions, including REEs determined by ion microprobe, of apatite and whitlockite in lunar rock assemblages rich in incompatible trace elements. Total concentrations of REE oxides in whitlockites range from 9-13 wt%, and those in apatites range from 0.15 to 1 wt%. Ratios of REE concentrations in whitlockite to those in coexisting apatite range from 10 to 60. The distribution of M...

Chloride-rich brines are increasingly recognized as playing an important role in high pressure and temperature metamorphic and magmatic systems. The origins of these saline multicomponent fluids are debated, but experimental evidence suggests that regardless of their origin they must be important agents of rock alteration and mass transfer wherever they occur. Studies of the solubility of quart...

Harzburgitic xenoliths cut by pyroxenite veins from Avachinsky volcano, Kamchatka, are derived from the sub-arc mantle and record element transfer from the slab to the arc. Olivine and orthopyroxene in the harzburgites have Li isotopic compositions (dLi = ?2.8 to ?5.6) comparable to estimates of the upper mantle (dLi * ?4 ± 2). The pyroxenite veins, which represent modal metasomatism and may th...

The goal of this study is to constrain the origins layering in seismic velocity structure within cratonic mantle lithosphere (i.e. mid-lithospheric discontinuities [MLDs]). For long-lived stations cratons worldwide, we calculated S-to-P converted phase receiver function stacks using time domain deconvolution and a k-means algorithm select robust, consistent functions. Negative MLDs appear only ...

The study area is located in the central Iranian tectono-magmatic zone, which is known for its world-class IOA-type Iron ore deposits. The Advanced Space borne Thermal Emission and Reflection Radiometer (ASTER) and Landsat Enhanced Thematic Mapper Plus (ETM+) image-processing techniques, were used in satellite imagery through conventional and also modern processing methods including band ratios...