Trace element distribution and Cr(VI) speciation in Ca-HCO3 and Mg-HCO3 spring waters from the northern sector of the Pollino massif, southern Italy
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Massif
Ultramafic rock
Vermiculite
Ultramafic rock
Massif
Section (typography)
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Genetic analysis of composition of the massif and a critical study of its evolution indicate a late-magmatic origin of the ores and an epigenetic character of the zones in which large economic accumulations of chromites are found. -- V. P. Sokoloff.
Massif
Chromite
Ultramafic rock
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A simplified procedure for the preparation of H-saturated vermiculite and kaolinite by successively treating them with H, OH, and H resins is described. X-ray diffractograms showed that the basal peak intensities of vermiculite were enhanced considerably by the resin treatment whereas those of kaolinite were enhanced only slightly. Cation exchange capacities at pHs 4.8 and 7.6 of both clays were decreased by the resin treatment. The proportion of pH-dependent CEC (pH 4.8 to 7.6) of vermiculite increased, however, while that of kaolinite decreased slightly. Although resin treatment for preparing H clays is recommended, care should be exercised in the interpretation of data obtained after such a treatment.
Vermiculite
Clay soil
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Mafic-ultramafic massifs of Tuva territories are located both within linear belts tracing deep faults and as "disordered" areas associated with some belts sufferedthe later fold-block dislocations. Sometimes fragments of mafic-ultramafic bodies are present in granitoidal intrusive asxenogenic blocks of various sizes. Areal location of ultramafic massifs is particularly observed in the east of Tuva within the Khamsarynsky structural-formation zone as well as in the structures of the Tuvinian-Mongolian middle massif. Geochemical features of the ultramafic massi frock variety studies are continued for obtaining convincing conclusions on their formational affiliation. Ultramafic massifs of Tuva have isolated single data in terms of the geochemical characteristics which requires a purposeful work in this direction. The present paper summarizes for the first time petro-geochemical characteristics of dunites of the Nizhnetarlashkynsky ultramafic massif and fragments of individual picritic dikes among them.
Massif
Ultramafic rock
Dike
Petrochemistry
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Massif
Ultramafic rock
Fractional crystallization (geology)
Chromite
Diopside
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Massif
Ultramafic rock
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Abstract The finest fractions of Upper Jurassic shales from the North Sea and onshore Denmark contain 80–90% of an illite-smectite-vermiculite (I-S-V) mixed-layer mineral and, in addition a phase which has X-ray diffraction (XRD) peaks at 7.20–7.26 Å and 3.56–3.58 Å in air- dried and glycolated specimens. This phase may be a fine kaolinite with a small thickness of coherent scattering domains (CSDs) or alternatively a mixed-layer mineral which has kaolinite as the dominant component. For one sample from the Norwegian well 9/4-3, these alternatives are investigated using the multi-specimen method by which agreement between the experimental pattern and the pattern calculated for one and the same structure is obtained for each of several specimens saturated with different cations and with/without glycolation. It is demonstrated that the modelled XRD patterns for a kaolinite-illite-vermiculite (K-I-V) structure having 0.94 kaolinite, 0.03 illite and 0.03 vermiculite layers and random alternation fit the experimental patterns.
Illite
Vermiculite
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