Supplemental Material: Water in omphacite fingerprints the thermal history of eclogites

Fourier transform infrared and Raman spectra, electron microprobe data, and resolved band absorbance ratios of samples.<br>

Supplemental Material: Water in omphacite fingerprints the thermal history of eclogites

Fourier transform infrared and Raman spectra, electron microprobe data, and resolved band absorbance ratios of samples.<br>

Supplemental Material: Late Mesoproterozoic low-P/T–type metamorphism in the North Wulan terrane: Implications for the assembly of Rodinia

Table S1: Representative electron microprobe data for minerals of garnet, spinel, biotite, cordierite, feldspar, and amphibole from garnetite (sample WL13-16), pelitic gneiss (sample WL16-27), and quartz schist (sample WL13-12) in the Statherian–Calymmian unit of the North Wulan terrane; Table S2: Monazite U-Pb data for the three analyzed metasedimentary samples in the North Wulan terrane, NW China, and external standard.

Supplemental Material: Late Mesoproterozoic low-P/T–type metamorphism in the North Wulan terrane: Implications for the assembly of Rodinia

Table S1: Representative electron microprobe data for minerals of garnet, spinel, biotite, cordierite, feldspar, and amphibole from garnetite (sample WL13-16), pelitic gneiss (sample WL16-27), and quartz schist (sample WL13-12) in the Statherian–Calymmian unit of the North Wulan terrane; Table S2: Monazite U-Pb data for the three analyzed metasedimentary samples in the North Wulan terrane, NW China, and external standard.

Supplemental Material: Late Mesoproterozoic low-P/T–type metamorphism in the North Wulan terrane: Implications for the assembly of Rodinia

Table S1: Representative electron microprobe data for minerals of garnet, spinel, biotite, cordierite, feldspar, and amphibole from garnetite (sample WL13-16), pelitic gneiss (sample WL16-27), and quartz schist (sample WL13-12) in the Statherian–Calymmian unit of the North Wulan terrane; Table S2: Monazite U-Pb data for the three analyzed metasedimentary samples in the North Wulan terrane, NW China, and external standard.

Serpentinization and chloritization of metamorphosed lherzolites in Darreh-Deh (east of Nain Ophiolite, Central Iran): Calcium source for rodingitization and tremolitization

The petrography and mineral chemistry of the metamorphosed lherzolite in Darreh-Deh massif (east of Nain Ophiolite, Central Iran) is investigated in order to find the calcium source for rodingitization and tremolitization. In comparison with olivine and orthopyroxene, the clinopyroxene has lower modal content and is more alteration-resistant. The microprobe data and petrography of these lherzolites indicate that Ca2+ cations can be released during serpentinization of orthopyroxene (with ~18 vol% and CaO~2.7 wt%) and clinopyroxene (with ~6 vol% and CaO~ > 20 wt%). In contrast, per- vasive serpentinization of mantle olivine with ~70 vol% and CaO~0.02–0.07 wt% is another expected source for producing Ca2+ rather than metamorphic olivine with CaO~ < 0.02 wt%. The released Ca2+ cannot be completely accommodated in crystal lattice of produced serpentine (with CaO~0.02–0.06 wt%), talc and chlorite (with CaO~0.015 wt%), but it can participate in formation of Ca-bearing tremolite (CaO~13 wt%), as a result of serpentinization of clinopyroxenes or subsequent metamorphism of peridotites at amphibolite facies and in formation of coarse-grained clinopyroxene blades and tremolite during rodingitization. Therefore, the calcium content in clinopyroxene, orthopyroxene and olivine of a plagioclase–free peridotite is a potential source of Ca2+, depending on the degree of serpentinization or chloritization.

Structural and chemical study of weishanite, (Au,Ag,Hg), from the Keystone mine, Colorado, USA.

ABSTRACTStructural data for weishanite, an alloy of Au, Ag and Hg, were collected for the first time from a crystal from the Keystone Mine, Colorado, USA. The structure was solved in the space group P63/mmc with the unit cell a = 2.9348(8) and c = 4.8215(18) Å] and refined to R = 0.0299 for 40 observed reflections [4σ(F) level] and four parameters and to R = 0.0356 for all 47 independent reflections. The weishanite structure can be considered a derivative of the zinc structure, with Au, Ag and Hg disordered in the same structural position. On this basis, we suggest that the formula is normalized to 1 atom with Z = 2, leading, for the sample investigated, to Au0.41Ag0.31Hg0.28 (electron microprobe data). Accordingly, weishanite can be considered the Au-rich isotype of schachnerite. A comparison with other Au/Ag-Hg alloys is presented together with a critical discussion about the nomenclature rules to be applied to alloys and simple metals.