Hydroxyl in omphacites and omphacitic clinopyroxenes of upper mantle to lower crustal origin beneath the Siberian platform
-
Monika Koch-Müller
,
Stanislav S. Matsyuk
Abstract
A series of clinopyroxenes from the lower crust and upper mantle beneath the Siberian platform was investigated by Fourier-transform infrared (FTIR) spectroscopy and transmission electron microscopy (TEM). The IR spectra of all our samples exhibit three groups of absorption bands at (1) 3445−3465, (2) 3500-3540, and (3) 3600-3624 cm-1. Using synchrotron IR radiation, which utilizes a spot size of only 5 × 5 μm, we realized that the intensities of the absorption bands, mostly those of group 3, showed extreme variation within one crystal. TEM as well as polarized and high-pressure IR spectroscopy indicated that the OH groups that cause the bands of group 3 were not intrinsic but due to nm-sized inclusions of sheet silicates.
The intensities and peak positions of the bands of group 2 correlate with the amount of tetrahedral Al3+ indicating that the charge-deficient substitution of Al for Si is responsible for the bands of group 2. The intensities and peak positions of the bands of group 1 correlate with the concentration of vacancies at M2 indicating that the cation vacancies at M2 control the incorporation of hydroxyl responsible for the bands of group 1. The bands of groups 1 and 2 are caused by the same type of OH dipole, however, occurring in different structural environments.
The concentration of the structurally bound water of the omphacitic clinopyroxene is in the range from 31 to 514 ppm H2O (by weight). Surprisingly, the lowest concentration was found in clinopyroxene, that comes from the highest pressure region, i.e., the diamond-bearing eclogite xenoliths of the Mir kimberlite pipe. The highest values were obtained in omphacites of the lower-pressure grospydites of the Zagadochnaya kimberlite pipe and in omphacitic clinopyroxene of the lower pressure granulites of the Udachnaya kimberlite pipe, respectively. The low water content of clinopyroxene from the high-pressure region seems to be controlled by low water activity during crystallization. However, hydrogen loss during the uplift cannot be ruled out.
© 2015 by Walter de Gruyter Berlin/Boston
Articles in the same Issue
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Articles in the same Issue
- Hydroxyl in omphacites and omphacitic clinopyroxenes of upper mantle to lower crustal origin beneath the Siberian platform
- Structural variations induced by difference of the inert pair effect in the stibnite-bismuthinite solid solution series (Sb,Bi)2S3
- Hydrogen solubility and speciation in natural, gem-quality chromian diopside
- Ultrastructure, aggregation-state, and crystal growth of biogenic nanocrystalline sphalerite and wurtzite
- Impactite from Henbury, Australia
- Neutron and synchrotron X-ray diffraction study of the structures and dehydration behaviors of ramsdellite and “groutellite”
- Hydrothermal synthesis and crystal chemistry of the new strontium uranyl selenites, Sr[(UO2)3(SeO3)2O2]⋅4H2O and Sr[UO2(SeO3)2]
- Study of cation order-disorder in MgAl2O4spinel by in situ neutron diffraction up to 1600 K and 3.2 GPa
- Magnetic granulometry from equilibrium magnetization measurements: Mineral magnetometry of superparamagnetic particles and application to synthetic ferrihydrites
- Hydroxide in kyanite: A quantitative determination of the absolute amount and calibration of the IR spectrum
- Analysis of uranyl-bearing phases by EXAFS spectroscopy: Interferences, multiple scattering, accuracy of structural parameters, and spectral differences
- X-ray diffraction evidence for a monoclinic form of stibnite, Sb2S3, below 290 K
- Sulfur species at chalcopyrite (CuFeS2) fracture surfaces
- Dehydration and rehydration process in boggsite: An in situ X-ray single-crystal study
- Empressite, AgTe, from the Empress-Josephine mine, Colorado, U.S.A.: Composition, physical properties, and determination of the crystal structure
- Correlation of pH-dependent surface interaction forces to amino acid adsorption: Implications for the origin of life
- A near-infrared spectroscopic study of hydroxyl in natural chondrodite
- High-pressure elasticity of a natural magnetite crystal
- Isotopic and chemical alteration of zircon by metamorphic fluids: U-Pb age depth-profiling of zircon crystals from Barrowʼs garnet zone, northeast Scotland
- A novel approach to determine high-pressure high-temperature fluid and melt compositions using diamond-trap experiments
- Lindbergite, a new Mn oxalate dihydrate from Boca Rica mine, Galiléia, Minas Gerais, Brazil, and other occurrences
- Pyrophyllite dehydroxylation process by First Principles calculations
- Plagioclase from planetary basalts: Chemical signatures that reflect planetary volatile budgets, oxygen fugacity, and styles of igneous differentiation
- The structure of the manganese oxide on the sheath of the bacterium Leptothrix discophora: An XAFS study
- An X-ray Rietveld study of piemontite on the join Ca2Al3Si3O12(OH)–Ca2Mn33+Si3O12(OH) formed by hydrothermal synthesis
- Raman spectroscopy of basic copper(II) and some complex copper(II) sulfate minerals: Implications for hydrogen bonding
- Incorporation of sodium into the chlorite structure: the crystal structure of glagolevite, Na(Mg,Al)6[Si3AlO10](OH,O)8
- Cation disorder in dolomite, CaMg(CO3)2, and its influence on the aragonite + magnesite ↔ dolomite reaction boundary
