Transformation of clay minerals in salt-affected soils, Pantanal wetland, Brazil

Geoderma ◽  
2020 ◽  
Vol 371 ◽  
pp. 114380 ◽  
Author(s):  
Gabriel Ramatis Pugliese Andrade ◽  
Sheila Aparecida Correia Furquim ◽  
Thiago Tavares Vidoca do Nascimento ◽  
Alex Cordeiro Brito ◽  
Gabriela Ribeiro Camargo ◽  
...  
Keyword(s):  
Clay Minerals ◽  
Salt Affected Soils ◽  
Pantanal Wetland ◽  
Transformation Of Clay Minerals

Salt-Affected Soils of Pantanal Wetland

2020 ◽  
pp. 229-254
Author(s):  
Sheila A. C. Furquim ◽  
Thiago T. Vidoca
Keyword(s):  
Salt Affected Soils ◽  
Pantanal Wetland

scholarly journals The Occurrence of Authigenic Clay Minerals in Alkaline-Saline Lakes, Pantanal Wetland (Nhecolândia Region, Brazil)

Minerals ◽  
2020 ◽  
Vol 10 (8) ◽  
pp. 718
Author(s):  
Isis Armstrong Dias ◽  
Leonardo Fadel Cury ◽  
Bruno Guimarães Titon ◽  
Gustavo Barbosa Athayde ◽  
Guilherme Fedalto ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Clay Minerals ◽  
Saline Lakes ◽  
Clay Fraction ◽  
Water Bodies ◽  
X Ray Diffraction ◽  
X Ray ◽  
Transmission Electron ◽  
Fine Clay ◽  
Pantanal Wetland

Mg clay minerals are usually associated with carbonates in alkaline-saline environments, precipitated from solution and/or transformation from other minerals. The aim of this research is to identify the mineralogy and geochemistry of clay minerals in different alkaline lakes in the Nhecolândia region, the southernmost region of the Pantanal wetland (Brazil). Sediment samples were analyzed by X-ray diffraction, X-ray fluorescence, scanning electron microscopy and transmission electron microscopy. Water samples were analyzed, determining their main cations and anions, in order to understand their relationship with the clays. The analyses allowed classifying the water bodies as saline, oligosaline and freshwater lakes. The sediments are composed mainly of quartz and a fine-clay fraction, dominated by illite, kaolinite and smectite. The XRD results showed illite and smectite mixed-layered in the saline lakes at Barranco Alto farm, whereas at Nhumirim farm, trioctahedral smectite was only observed in one lake. The smectite minerals were normally identified coupled with calcite at the top of the sequences, associated with exopolymeric substances (EPS) in the lakes, suggesting that these minerals are precipitating due to the physical-chemical and biological conditions of the water bodies.

Transformation of clay minerals in nanoparticles of several zonal soils in China

2018 ◽  
Vol 19 (1) ◽  
pp. 211-220 ◽  
Author(s):  
Zhi Yi Zhang ◽  
Li Huang ◽  
Fan Liu ◽  
Ming Kuang Wang ◽  
Georges Martial Ndzana ◽  
...  
Keyword(s):  
Clay Minerals ◽  
Zonal Soils ◽  
Transformation Of Clay Minerals

Salt-affected soils evolution and fluvial dynamics in the Pantanal wetland, Brazil

Geoderma ◽  
2017 ◽  
Vol 286 ◽  
pp. 139-152 ◽  
Author(s):  
Sheila Aparecida Correia Furquim ◽  
Marjory Araujo Santos ◽  
Thiago Tavares Vidoca ◽  
Marcelo de Almeida Balbino ◽  
Evaldo Luis Cardoso
Keyword(s):  
Fluvial Dynamics ◽  
Salt Affected Soils ◽  
Pantanal Wetland

Formation and Transformation of Clay Minerals in the Hydrothermal Deposits of Middle Valley, Juan de Fuca Ridge, ODP Leg 169

2000 ◽  
Vol 95 (2) ◽  
pp. 361-389 ◽  
Author(s):  
K. S. Lackschewitz ◽  
A. Singer ◽  
R. Botz ◽  
D. Garbe-Schonberg ◽  
P. Stoffers ◽  
...  
Keyword(s):  
Clay Minerals ◽  
Juan De Fuca Ridge ◽  
Fuca Ridge ◽  
Hydrothermal Deposits ◽  
Juan De Fuca ◽  
Transformation Of Clay Minerals

Transformation of clay minerals caused by an alkaliphilic cyanobacterial community

Microbiology ◽  
2009 ◽  
Vol 78 (6) ◽  
pp. 776-784 ◽  
Author(s):  
T. V. Alekseeva ◽  
E. V. Sapova ◽  
L. M. Gerasimenko ◽  
A. O. Alekseev
Keyword(s):  
Clay Minerals ◽  
Cyanobacterial Community ◽  
Transformation Of Clay Minerals

scholarly journals Chemical compaction of deep buried mudstone and its influence on pressure prediction

2020 ◽  
Vol 600 (1) ◽  
pp. 012012
Author(s):  
Li Chao ◽  
Luo Xiaorong ◽  
Zhang Likuan ◽  
Lei Yuhong ◽  
Chen Ming ◽  
...  
Keyword(s):  
Pore Pressure ◽  
Clay Minerals ◽  
Eastern China ◽  
Bohai Bay ◽  
Dongying Depression ◽  
Pore Pressure Prediction ◽  
Shahejie Formation ◽  
Vertical Effective Stress ◽  
The Impact ◽  
Transformation Of Clay Minerals

Abstract The chemical compaction of mudstones which is dominated by the transformation of clay minerals leads to significant changes in the mineral composition and microstructure of mudstone during process of deep burial. In particular, the transformation of smectite to illite in mudstones results in noticeable impact on the pore pressure formation and the overpressure logging responses. At present, the study about the pressurization mechanism of chemical compaction and the impact on overpressure logging responses is really weak, which made it hard to pore pressure identification and pressure prediction for deep buried formations. Taking the Paleogene Shahejie Formation in the Dongying depression of the Bohai Bay Basin in eastern China as typical case, this paper analyses the characteristics of clay mineral transformation of the Shahejie Formation in the Dongying depression, the logging responses of overpressures, and the influence of chemical compaction on the prediction of pore pressure. The results showed that the chemical compaction of mudstones changes the relationship between the petrophysical properties of mudstone and vertical effective stress and the logging responses of overpressure. The typical characteristic of chemical compaction manifested as density increase continuous with the depth. The normal compaction trends of the different compaction stages are the basis for overpressure mechanisms identification and pore pressure prediction. The depth of the rapid transformation of clay minerals has a good consistency with the top of overpressure zone (2000–2800 m) in Dongying depression, which indicates that the overpressure and its logging responses may be related to the chemical compaction of mudstones. The measured pressure in intervals deeper than 3000 m is closer to the predicted pressure based on the normal compaction trend of chemical compaction.

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