Clays and Clay Minerals

Clays and Clay Minerals 10 records found  Search took 0.01 seconds. 
1.
13 p, 1.3 MB Clay mineralogy across the P-T boundary of the Xiakou section, China : Evidence of clay provenance and environment / Hong, Hanlie (China University of Geosciences. Faculty of Earth Sciences) ; Zhang, Ning (China University of Geosciences. Faculty of Earth Sciences) ; Zhaohui, Li (National Cheng Kung University. Department of Earth Sciences) ; Xue, Huijuang (China University of Geosciences. Faculty of Earth Sciences) ; Xia, Wenchen (China University of Geosciences. Faculty of Earth Sciences) ; Yu, Na (China University of Geosciences. Faculty of Earth Sciences)
The provenance of clays in shaley intervals across the Permian-Triassic boundary (PTB) in the Xiakou section was investigated by X-ray diffraction (XRD), differential scanning calorimetry (DSC), and scanning electron microscopy (SEM), and the results suggest that the layers have three different provenances. [...]
2008 - 10.1346/CCMN.2008.0560201
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 131-143  
2.
11 p, 458.8 KB Microstructure of organo-bentonites in water and the effect of steric hindrance on the uptake of organic compounds / Zhu, Jianxi (Zhejiang University. Department of Environmental Science) ; Zhu, Lizhong (Zhejiang University. Department of Environmental Science) ; Zhu, Runliang (Zhejiang University, Department of Environmental Science) ; Chen, Boaliang (Zhejiang University. Department of Environmental Science)
To further elucidate adsorption-to-partition transitional mechanisms which have been proposed previously for organo-bentonites with different surfactant loadings, the structural characteristics of interlayer surfactant aggregates on organo-bentonite with different surfactant cetyltrimethylammonium bromide loading levels (0. [...]
2008 - 10.1346/CCMN.2008.0560202
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 144-154  
3.
20 p, 288.5 KB Surface area and layer charge of smectite from CEC and EGME/H2O-retention measurements / Środoń, Jan (Institute of Geological Sciences PAN) ; McCarty, Douglas K. (Chevron ETC)
The total specific surface area (TSSA) and smectitic layer charge (Q) calculated from the structural formulae and unit-cell dimensions of 12 pure smectite samples were used as a reference in the design and evaluation of TSSA and Q measurement techniques based on cation exchange capacity (CEC), HO retention at 47% RH, and ethylene glycol monoethyl ether (EGME) retention. [...]
2008 - 10.1346/CCMN.2008.0560203
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 155-174  
4.
15 p, 252.9 KB Partitioning of Fe(II) in reduced nontronite (NAu-2) to reactive sites : Reactivity in terms of Tc(VII) reduction / Jaisi, Deb P. (Yale University. Department of Geology and Geophysics) ; Dong, Hailiang (Miami University. Department of Geology) ; Morton, John P. (Miami University. Department of Geology)
Clay minerals impart important chemical properties to soils, in part, by virtue of changes in the redox state of Fe in their crystal structures. Therefore, measurement of Fe(III)/Fe(II) and partitioning of Fe(II) in different reactive sites in clay minerals (during biological and chemical Fe(III) reduction) is essential to understand their role and their relative reactivity in terms of reduction and immobilization of heavy metal contaminants such as technetium. [...]
2008 - 10.1346/CCMN.2008.0560204
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 175-189  
5.
15 p, 2.1 MB Natrolitite, an unusual rock - Occurrence and petrographic and geochemical characteristics (Eastern Turkey) / Çiftçi, Emín (Nigde University. Department of Geological Engineering) ; Hogan, John P. (University of Missouri-Rolla. Department of Geology and Geophysics) ; Kolayli, Hasan (Karadeniz Technical University. Department of Geological Engineering) ; Çadirli, Emín (Nigde University. Department of Physics)
Very unusual rocks consisting of natrolite (>95 vol. %) ± pargasite (<5 vol. %) and rare albite (<1 vol. %) have been discovered in the Kop mountain range, eastern Turkey. We propose to call these rocks 'natrolitite' and 'pargasite natrolitite'. [...]
2008 - 10.1346/CCMN.2008.0560206
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 207-221  
6.
22 p, 1.9 MB Spatial and temporal evolution of hydrothermal alteration at Lavras do Sul, Brazil : Evidence from dioctahedral clay minerals / Bongiolo, Everton Marques (Universidade Federal do Rio Grande do Sul. Instituto de Geociências) ; Patrier-Mas, Patricia (Université de Poitiers) ; Mexias, André Samparo (Universidade Federal do Rio Grande do Sul. Instituto de Geociências) ; Beaufort, Daniel (Université de Poitiers) ; Laquintinie Formoso, Milton Luiz (Universidade Federal do Rio Grande do Sul. Instituto de Geociências)
The Au-Cu (±Pb, Zn, Ag) prospects of Lavras do Sul, southernmost Brazil, are hosted in Neoproterozoic granitic and volcanogenic rocks. Mineralization occurs in structurally controlled N40°W to E-W quartz veins; sericite (±chlorite) and sulfides are the main secondary minerals in associated wall rocks. [...]
2008 - 10.1346/CCMN.2008.0560207
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 222-243  
7.
15 p, 3.3 MB The occurrence and genesis of clay minerals associated with quaternary caliches in the Mersin area, southern Turkey / Kadir, Selahattin (Eskişehir Osmangazi University. Department of Geological Engineering) ; Eren, Muhsin (Mersin University. Department of Geological Engineering)
Caliche in various forms, namely powdery, nodule, tube, fracture-infill, laminar crust, hard laminated crust (hardpan), and pisolitic crust, is widespread in the Mersin area in southern Turkey. It generally occurs within and/or over the reddish-brown mudstone of the Kuzgun Formation (Tortonian, Miocene) and alluvial red soils of the Quaternary. [...]
2008 - 10.1346/CCMN.2008.0560208
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 244-258  
8.
13 p, 1.3 MB Interaction of aqueous acidic-fluoride waste with natural Tunisian soil / Hamdi, Noureddine (Technopole de Borj Cedria. Unité Matériaux.) ; Srasra, Ezzedine (Technopole de Borj Cedria. Unité Matériaux)
Clayey soils are essential materials used to reduce hydraulic conductivity and pollutant migration, common at sites of waste disposal. This study investigates the possible use of a Tunisian soil as a lining material for disposal sites for acidic-fluoride wastes. [...]
2008 - 10.1346/CCMN.2008.0560209
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 259-271  
9.
11 p, 467.8 KB Quantitative phase analysis of bentonites by the rietveld method / Ufer, K. (TU Bergakademie Freiberg. Institute of Mineralogy) ; Stanjek, H. (RWTH Aachen University. Clay and Interface Mineralogy) ; Roth, G. (RWTH Aachen University. Institute of Crystallography) ; Dohrmann, R. (BGR/LBEG) ; Kleeberg, R. ; Kaufhold, S. (BGR/LBEG)
Thirty six bentonite samples from 16 different locations were examined in order to demonstrate the applicability of a new Rietveld description approach for quantitative phase analysis. X-ray diffraction patterns of the bulk material were obtained and analyzed by the Rietveld method. [...]
2008 - 10.1346/CCMN.2008.0560210
Clays and Clay Minerals, Vol. 56, Núm. 2 (2008) , p. 272-282  
10.
18 p, 1.8 MB Rietveld refinement of disordered illite-smectite mixed-layer structures by a recursive algorithm. II : Powder-pattern refinement and quantitative phase analysis / Ufer, Kristian (BGR/LBEG) ; Kleeberg, Reinhard (Institute of Mineralogy. TU Bergakademie Freiberg) ; Bergmann, Jörg ; Dohrmann, Reiner (BGR/LBEG)
X-ray diffraction (XRD) of powdered materials is one of the most common methods used for structural characterization as well as for the quantification of mineral contents in mixtures. The application of the Rietveld method for that purpose requires structure models for each phase. [...]
2012 - 10.1346/CCMN.2012.0600508
Clays and Clay Minerals, Vol. 60, Núm. 5 (2012) , p. 535-552  

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