scholarly journals Garnet stability in the Al–Ca–Mg–Si–Y–O system with implications for reactions between TBCs, EBCs, and silicate deposits

2020 ◽  
Vol 103 (9) ◽  
pp. 5270-5282
Author(s):  
Eeshani Godbole ◽  
Nikhil Karthikeyan ◽  
David Poerschke
Keyword(s):  
Silicate Deposits

High-temperature degradation of the in-situ laser-glazed plasma sprayed LaMgAl11O19 thermal barrier coating exposed to Ca-Mg-Al-silicate deposits

2020 ◽  
Vol 176 ◽  
pp. 108934
Author(s):  
Yiwei Sun ◽  
Hengkai Wu ◽  
Hongxu Zhao ◽  
Xiaolong Chen ◽  
Chaoqian Guo ◽  
...  
Keyword(s):  
High Temperature ◽  
Thermal Barrier Coating ◽  
Thermal Barrier ◽  
Barrier Coating ◽  
Plasma Sprayed ◽  
Silicate Deposits

ESQUIREITE, BaSi6O13∙7H2O, A NEW LAYER SILICATE FROM THE BARIUM SILICATE DEPOSITS OF CALIFORNIA

2015 ◽  
Vol 53 (1) ◽  
pp. 3-12 ◽  
Author(s):  
Anthony R. Kampf ◽  
Robert M. Housley ◽  
Gail E. Dunning ◽  
Robert E. Walstrom
Keyword(s):  
Layer Silicate ◽  
Barium Silicate ◽  
Silicate Deposits

scholarly journals Perspective of gold-bearing deposits in the ferruginous-siliceous formations of Egypt and Kursk Magnetic Anomaly

2019 ◽  
Vol 20 (2) ◽  
pp. 174-183
Author(s):  
Hani E. Sharafeldin ◽  
Alexander A. Vercheba
Keyword(s):  
Gold Mineralization ◽  
Hydrothermal Activity ◽  
Eastern Desert ◽  
Iron Silicate ◽  
Shear Cracks ◽  
Nubian Shield ◽  
Tectonic Dislocations ◽  
Silicate Deposits ◽  
Arabian Nubian Shield ◽  
Gold Bearing

Banded ferruginous-siliceous formations (FSF) are confined to the Precambrian basement of the Arabian-Nubian Shield within the central part of the Eastern Desert of Egypt. Gold mineralization is spatially associated with banded ferruginous quartzite, representing one of the most ancient manifestations of gold ore. The Precambrian rocks are combined into deposits complex of the Neoproterozoic Pan-African megacycle of the territory development. Banded iron-silicate rocks occur in sedimentary-volcanogenic rocks that were formed in the subduction trough zones, and are represented by metamorphosed ferruginous quartzites, jaspilites and schists. FSF show tectonic dislocations, shear cracks, and fracture cracks made by gold-quartz-sulphide mineralization. Promising for the identification of gold-bearing mineralization in the rocks of the FSF can be iron-silicate deposits with the occurrence of epigenetic hydrothermal activity as a result of activation of the submarine volcanism of the tholeiitic type.

Paleoenvironmental insights from the deposition and diagenesis of Aptian pre-salt magnesium silicates from the Lula Field, Santos Basin, Brazil

2022 ◽  
Vol 92 (1) ◽  
pp. 12-31
Author(s):  
Nívea G. Carramal ◽  
Daniel M. Oliveira ◽  
Alessandra S.M. Cacela ◽  
Matheus A.A. Cuglieri ◽  
Natasha P. Rocha ◽  
...  
Keyword(s):  
Homogeneous Nucleation ◽  
Scientific Community ◽  
Intermediate Energy ◽  
Energy Conditions ◽  
Fine Grained ◽  
Rock Fragments ◽  
Diagenetic Alteration ◽  
Current Action ◽  
Magnesium Silicates ◽  
Silicate Deposits

ABSTRACT Since the discovery of giant Aptian pre-salt reservoirs in Brazilian margin basins, the study of lacustrine carbonates has drawn great attention from the scientific community. Comparatively, minor attention was given to the characterization and genesis of the Mg-silicates (e.g., stevensite, kerolite) which are commonly associated with these carbonates. A systematic petrological study was performed in the Aptian Barra Velha Formation (BVF) within distinct structural compartments of the giant Lula Field in the Santos Basin, in order to recognize the patterns of primary formation and diagenetic alteration of these Mg-silicates. Mg-silicates occur as peloids, ooids, intraclasts, and fine-grained laminated deposits, either mixed in variable proportions with other particles, such as carbonate bioclasts and volcanic rock fragments, or constituting specific intrabasinal deposits. In the BVF interval, clay peloids and laminated deposits are associated with spherulitic and fascicular calcite aggregates, as substrate and hosts for these precipitates. Ooids are interpreted as formed at the sediment–water interface by the nucleation of concentric envelopes on the surface of particles (heterogeneous nucleation), through repeated rolling under gentle wave and current action. Laminated deposits, interpreted as precipitated directly from the water column (homogeneous nucleation) in highly supersaturated and low-hydrodynamic-energy environments, constitute extensive deposits in the BVF. Peloids were probably formed in intermediate energy conditions. Some ooidal arenites show porosity from the dehydration and contraction, and/or the dissolution of ooids. In some rocks, these pores are filled with fibrous calcite, while the remaining Mg-silicates are replaced by dolomite, calcite, or silica. A similar diagenetic pattern occurs in the laminated deposits, where magnesite and dolomite fill shrinkage pores formed along their characteristic wavy laminae. Owing to their elevated solubility, most of the Mg-silicates were dissolved, or intensely replaced by calcite, dolomite, or silica. The detailed petrologic analysis indicates that the original volumes of Mg-silicates were substantially larger, and that their deposition was widespread in the basin, including on structurally high areas. The types and intensity of diagenetic alteration of the Mg-silicate deposits are distinct for each structural compartment, being more intense towards the highs and closer to the overlying evaporites, which imposed a strong influence on reservoir quality.

The integration of physical rock properties, mineralogy and geochemistry for the exploration of large zinc silicate deposits: A case study of the Vazante zinc deposits, Minas Gerais, Brazil

2017 ◽  
Vol 136 ◽  
pp. 400-416 ◽  
Author(s):  
Alexandra J. McGladrey ◽  
Gema Ribeiro Olivo ◽  
Adalene Moreira Silva ◽  
Gustavo Diniz Oliveira ◽  
Basilio Botura Neto ◽  
...  
Keyword(s):  
Minas Gerais ◽  
Rock Properties ◽  
Zinc Silicate ◽  
Physical Rock Properties ◽  
Silicate Deposits ◽  
Physical Rock ◽  
Zinc Deposits

Novel thermal barrier coatings repel and resist molten silicate deposits

2019 ◽  
Vol 163 ◽  
pp. 71-76 ◽  
Author(s):  
Baopeng Zhang ◽  
Wenjia Song ◽  
Liangliang Wei ◽  
Yuxuan Xiu ◽  
Huibin Xu ◽  
...  
Keyword(s):  
Thermal Barrier Coatings ◽  
Thermal Barrier ◽  
Barrier Coatings ◽  
Molten Silicate ◽  
Silicate Deposits

scholarly journals Reagent approach for silicate deposits prevention in waste heat boilers

2019 ◽  
Vol 288 ◽  
pp. 012012
Author(s):  
D.I. Khasanova ◽  
A.A. Panteleev
Keyword(s):  
Waste Heat ◽  
Silicate Deposits

A computational modeling framework for reaction and failure of environmental barrier coatings under silicate deposits

2020 ◽  
Vol 103 (9) ◽  
pp. 5196-5213 ◽  
Author(s):  
William D. Summers ◽  
David L. Poerschke ◽  
Matthew R. Begley ◽  
Carlos G. Levi ◽  
Frank W. Zok
Keyword(s):  
Computational Modeling ◽  
Modeling Framework ◽  
Barrier Coatings ◽  
Environmental Barrier Coatings ◽  
Environmental Barrier ◽  
Silicate Deposits

Nickel Laterites: A Review

SEG Discovery ◽  
2003 ◽  
pp. 1-18
Author(s):  
S.A. Gleeson ◽  
C.R.M. Butt ◽  
M. Elias
Keyword(s):  
New Caledonia ◽  
Tectonic Setting ◽  
Acid Leaching ◽  
Nickel Laterite ◽  
Mining Operations ◽  
Nickel Matte ◽  
Open Cast Mining ◽  
Pressure Acid Leaching ◽  
Physical And Chemical ◽  
Silicate Deposits

ABSTRACT Nickel laterite deposits are formed by the prolonged and pervasive weathering of Ni silicate-bearing ultramafıc rocks, generally in tropical to subtropical climates. The deposits can be further classifıed as hydrous silicate deposits (e.g., SLN Operations, New Caledonia), clay silicate deposits (e.g., Murrin Murrin, Australia), and oxide deposits (e.g., Moa Bay, Cuba; Cawse, Australia) on the basis of the ore mineralogy. The physical and chemical nature of a nickel laterite deposit is a function of many factors, including the composition of the parent rock, the tectonic setting, climate, topography (specifıcally, laterite morphology), and drainage. Nickel laterite ore is extracted using both selective and bulk mining methods in open cast mining operations. The mined ore has traditionally been processed either by hydrometallurgical leaching technology (pressure acid leach or Caron processes) to produce oxides of nickel and cobalt or mixed Ni-Co sulfıdes for market, or by pyrometallurgical smelting to produce ferronickel granules or nickel matte. However, recent advances in high-pressure acid leaching and continued testing of atmospheric leach technology should lead to a reduction in overall operating costs and increased exploitation of Ni laterite resources in the future.

scholarly journals Reactions of molten silicate deposits with yttrium monosilicate

2020 ◽  
Vol 103 (4) ◽  
pp. 2919-2932 ◽  
Author(s):  
William D. Summers ◽  
David L. Poerschke ◽  
Aidan A. Taylor ◽  
Andrew R. Ericks ◽  
Carlos G. Levi ◽  
...  
Keyword(s):  
Molten Silicate ◽  
Silicate Deposits
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