Evaluation of glauconite rock color stability during firing

Valančienė, Virginija; Šiaučiūnas, R.; Valančius, Zenonas

doi:10.1016/j.clay.2014.06.019

Cited by 11 publications

(2 citation statements)

References 35 publications

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“…It is also known that a higher iron content in the form of hematite results in a redder color (Valanciene et al. ). However, the alteration colors are only found within the drill core F2, and are not observed in the drill core F3 nor within the rocks sampled at the surface (Osinski et al.…”

Section: Discussionmentioning

confidence: 99%

Hydrothermally enhanced magnetization at the center of the Haughton impact structure?

Zylberman

Quesnel

Rochette

et al. 2017

Meteorit & Planetary Scien

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Haughton is a ~24 Myr old midsize (apparent diameter 23 km) complex impact structure located on Devon Island in Nunavut, Canada. The center of the structure shows a negative gravity anomaly of −12 mGal coupled to a localized positive magnetic field anomaly of ~900 nT. A field expedition in 2013 led to the acquisition of new ground magnetic field mapping and electrical resistivity data sets, as well as the first subsurface drill cores down to 13 m depth at the top of the magnetic field anomaly. Petrography, rock magnetic, and petrophysical measurements were performed on the cores and revealed two different types of clast‐rich polymict impactites: (1) a white hydrothermally altered impact melt rock, not previously observed at Haughton, and (2) a gray impact melt rock with no macroscopic sign of alteration. In the altered core, gypsum is present in macroscopic veins and in the form of intergranular selenite associated with colored and zoned carbonate clasts. This altered core has a natural remanent magnetization (NRM) four to five times higher than materials from the other core but the same magnetic susceptibility. Their magnetization is still higher than the surrounding crater‐fill impact melt rocks. X‐ray fluorescence data indicate a similar proportion of iron‐rich phases in both cores and an enrichment in silicates within the altered core. In addition, alternating‐field demagnetization results show that one main process remagnetized the rocks. These results support the hypothesis that intense and possibly localized post‐impact hydrothermal alteration enhanced the magnetization of the clast‐rich impact melt rocks by crystallization of magnetite within the center of the Haughton impact structure. Subsequent erosion was followed by in situ concentration in the subsurface leading to large magnetic gradient on surface.

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Section: Discussionmentioning

confidence: 99%

Hydrothermally enhanced magnetization at the center of the Haughton impact structure?

Zylberman

Quesnel

Rochette

et al. 2017

Meteorit & Planetary Scien

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“…Analysis of modern production of colored brick using high-performance color modifiers [11][12][13][14][15][16] shows that bulk coloring of wall ceramic materials with oxide pigments generally causes a number of problems. One of the main problems is disruption of sintering process of argillaceous minerals while burning which leads to degradation of physical and mechanical properties of ceramics [17,18].…”

Section: Introductionmentioning

confidence: 99%

Structure and properties of ceramic brick colored by manganese-containing wastes

et al. 2018

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Abstract. The given paper investigates the influence of manganesecontaining wastes on bulk coloring and physical and mechanical properties of wall ceramic materials with matrix structure. Conventional research methods to study physical and mechanical properties of ceramic specimens were used in the present study. The structure and phase state of decorative ceramic materials were investigated by means of physical-chemical analysis. Authors suggested the model to form coloring layer in ceramic matrix composites based on argillaceous raw materials and coloring pigment. Macrostructure was studied on ceramic samples manufactured according to the developed method from clay loam of moderate plasticity and wastes of manganese mining. The paper provides results of pilot testing on production of colored ceramic brick. It was found that incorporation of coloring component does not decrease strength properties of ceramic matrix materials. Authors defined the palette and color code for decorative ceramic specimens manufactured with different content of coloring component of manganese mining wastes according to RGB color codes chart.

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Physical and mechanical properties of granite after high-temperature and acidic treatment for the enhanced geothermal system

Deng

et al. 2022

Bull Eng Geol Environ

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Evaluation of glauconite rock color stability during firing

Cited by 11 publications

References 35 publications

Hydrothermally enhanced magnetization at the center of the Haughton impact structure?

Hydrothermally enhanced magnetization at the center of the Haughton impact structure?

Structure and properties of ceramic brick colored by manganese-containing wastes

Physical and mechanical properties of granite after high-temperature and acidic treatment for the enhanced geothermal system

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