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Redox state of lithospheric mantle in central Siberian Craton; a Moessbauer study of peridotite xenoliths from the Udachnaya Kimberlite


, : Redox state of lithospheric mantle in central Siberian Craton; a Moessbauer study of peridotite xenoliths from the Udachnaya Kimberlite. Mineralogical Magazine 75.3: 930

Redox state in a vertical profile of lithospheric mantle in central Siberian craton (Russia) was determined based on peridotite xenoliths from the 360 My old Udachnaya kimberlite. Equilibration temperatures (T) and pressures (P) for garnet peridotites are 860-1340 degrees C; P values for spinel peridotites were estimated from T (760-965 degrees C) projections to a conductive geotherm defined by the gar peridotites. Mossbauer spectroscopy was used to obtain Fe(3+) /SFe ratios in garnet from 15 samples (9-23%) and spinel from 7 samples (6-22%). Oxygen fugacity (f(O2) ) was calculated using oxygen thermobarometry. The f(O2) decreases with pressure, hence depth. Low-T samples (750-1000 degrees C; P=2.6-5.3 GPa) yield f(O2) (DFMQ)=(0.0) to (-1.8) log units whereas high-T (1200-1350 degrees C; 5.4-6.8 GPa) samples have f(O2) (DFMQ)=(-2.4) to (-3.1) log units. The low-T peridotites overlap the graphite and carbonate stability fields; the high-T gar peridotites plot in the diamond stability field. Speciation of hypothetical C-O-H fluids coexisting with the rocks was assessed from the T, P and f(O2) data. Fluids for the high-T, hence the deepest, samples mainly consist of methane and water indicating that these "craton roots" are not likely to contain partial melts because of high T's of peridotite solidus in the presence of reduced C-H compounds.

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Vallery, R.Dot, P.; Verlaine, P., 1956: Verlaine at Boussais Hospital, according to his letters. La Presse Medicale 64(73): 1677-1678

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Sweet, R., A.; Pollock, B., G.; Mulsant, B., H.; Rosen, J.; Lo, K.-Hung; Yao, J., K.; Henteleff, R., A.; Mazumdar, S., 1997: Association of plasma homovanillic acid with behavioral symptoms in patients diagnosed with dementia: A preliminary report. Neuroleptic treatment of psychotic symptoms or agitated behavior in elderly patients diagnosed with dementia is associated with reduced efficacy and increased rates of neuroleptic-induced parkinsonism in comparison to younger patients with schizop...

Bishara, W.; Isikman, S.O.; Ozcan, A., 2012: Lensfree optofluidic microscopy and tomography. Microfluidic devices aim at miniaturizing, automating, and lowering the cost of chemical and biological sample manipulation and detection, hence creating new opportunities for lab-on-a-chip platforms. Recently, optofluidic devices have also emerge...

Closs, E., 1997: The human cationic amino acid transporters hCAT-1, hCAT-2A and hCat-2B Three related carriers with distinct transport properties. Amino Acids (Vienna) 13(1): 47-48