Weathering processes and pickeringite formation in a
randomly-interstratified biotite-vermiculite. From the mineralog- ical studies, qualitative weathering processes for the schist are formulated. A probable mechanism for the intense chemical weathering of the schist appears to be oxidation of iron sulfides to form iron oxide-hydroxides, sulfates, and sulfuric acid. This
Mineral transformation, element transport and hydrological …
The diagnostic 002/003 reflection of 5.58 Å at 15.88° 2θ after EG treatment indicates it as randomly interstratified I/S (R0 I/S) contains ∼ 20 % of illite layers (Moore and Reynolds, 1997). Similar to the slightly-weathered sample, the 11.9 Å peak in Mg saturated samples expanded to 13.2 Å after EG treatment, and this peak collapsed to ...
Randomly Interstratified Serpentine/Chlorite: Its Detection …
These results are consistent with a randomly interstratified 7-Å/14-Å structure, which is most likely serpentine/chlorite. Quantitative analysis of line broadening and model calculations indicate that the serpentine/chlorite contains 7% serpentine layers. A simplified method is proposed for quantifying randomly interstratified serpentine ...
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WEATHERING OF CHLORITE: I. REACTIONS AND …
Figure 3. Optical micrograph of saprock showing relations of primary mineral weathering with micro-fissures (Fis). Chlorite (Chl) weathering adjacent to the micro-crack shows opaque to reddish ...
(PDF) Randomly interstratified illite-vermiculite from …
Randomly interstratified illite-vermiculite from weathering of illite in red earth sediments in Xuancheng, southeastern China (PDF) Randomly interstratified illite …
Interstratified vermiculite–mica in the gneiss
Weathering took place mostly by low-pH solutions and in warm environment and the most extensive degree of weathering was at the HV4 site, in which the lode of vermiculite is the biggest. ... South China. Our results show that weathering of biotite synchronously produced randomly interstratified biotite/vermiculite (B/V) and …
Randomly interstratified illite-vermiculite from weathering …
Randomly interstratified illite-vermiculite from weathering of illite in red earth sediments in Xuancheng, southeastern China
Clay minerals in sediments of Portuguese reservoirs and their
The weathering mineralogy of the rocks with higher influence on the sedimentation input ... but the frequent occurrence of randomly interstratified structures and medium-disordered crystallization degrees favour the slow release of components from relatively loose crystal structures, leading to a marked decrease of the water quality. ...
Characterization of Hydroxy-Interlayered Vermiculite and …
X-ray diffraction, FTIR, and chemical analyses were performed on clay fractions (1–2 µm, <0.1 µm), separated by means of size fractionations and high-gradient magnetic separation techniques, from a Cryorthod developed in a chlorite-mica schist saprolite. Weathering of large phyllosilicates pre-existing in the saprolite involves …
Randomly interstratified illite―vermiculite from …
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Intensity and duration of chemical weathering: An example …
Soil clays in this part of the Koolau Mountains are mineralogically complex; principal phases include smectite, kaolinite, and halloysite, but pure end member phases are uncommon. Rather, most phases contain some amount of mixed layering. Smectite may contain small (<5%) amounts of randomly interstratified halloysite.
Randomly interstratified illite–vermiculite from weathering of …
Randomly interstratified illite–vermiculite from weathering of illite in red earth sediments in Xuancheng, southeastern China. Geoderma ( IF 6.1 ) Pub Date : 2014 …
Crystallite thickness (Т) and crystallite content in …
The randomly interstratified B/V was considered to form under intense weathering climate condition (Jeong, 2000;Pozzuoli et al., 1992; Tolpeshta et al., 2019), since intense chemical weathering ...
Clays and Clay Minerals, Vol. 33, No. 6, 559, 1985.
smectite produce random interstratifications (Sawh- ney, 1967, 1969). In recent experiments using Trans- vaal vermiculite, we have observed that increased sorption of potassium produces regularly interstratified mica/vermiculite in the 2-0.2-pm size fractions and randomly interstratified structures in the < 0.2-#m size fractions.
Characterization of Hydroxy-Interlayered …
Characterization of Hydroxy-Interlayered Vermiculite and Illite/Smectite Interstratified Minerals from the Weathering of Chlorite in a Cryorthod . × Close Log In. Log in with Facebook Log in with Google. …
Randomly interstratified illite–vermiculite from …
Our results show that weathering of biotite synchronously produced randomly interstratified biotite/vermiculite (B/V) and halloysite, and the B/V clay …
Weathering of Chlorite: I. Reactions and Products in …
The weathering of chlorite in hydrothermally-altered basalt was studied with XRD, TEM and electron microprobe to determine the type and orientation of secondary minerals. Optical examination indicated chlorite assemblages to have altered in two distinct microsites: one microsite near micro-fissures traversing the regolith units, and the other …
Weathering processes and pickeringite formation in a
X-ray diffraction studies of the weathering residues and the sulfate efflorescences have also identified dioctahedral and trioctahedral illite, kaolinite, vermiculite, and an 11–12 Å phase, thought to be a type of randomly-interstratified biotite-vermiculite. From the mineralogical studies, qualitative weathering processes for the schist are ...
Randomly interstratified illite-vermiculite from weathering …
Mixed-layer illite-vermiculite (I/V) clays of the Xuancheng red earth were investigated using X-ray diffraction (XRD), Fourier-transform infrared (FTIR) spectrometer, and high-resolution transmission electron microscopy (HRTEM) methods. The XRD results indicated that the mixed layer I/V clays were characterized by the broad 10-14 Å peak with a …
Characterization of Hydroxy-Interlayered Vermiculite and …
X-ray diffraction, FTIR, and chemical analyses were performed on clay fractions (1–2 µ m, <0.1 µ m), separated by means of size fractionations and high-gradient magnetic separation techniques, from a Cryorthod developed in a chlorite-mica schist saprolite. Weathering of large phyllosilicates pre-existing in the saprolite involves …
Interstratified Clay Minerals in the Weathering Environment
A weathering sequence involving the transformation of clay mica to vermiculite to low charge vermiculite/high charge smectite occurred. -from Authors ... was a randomly interstratified illite ...
Hydroxy-interlayered vermiculite genesis in Jiujiang late …
This suggests that the HIV clays in Jiujiang soils resulted from illite weathering. The shift of a small X-ray diffraction reflection between 1.0 and 1.4 nm for an air-dried and glycerol-solvated sample to 0.997 nm after heating at 550 °C indicated the presence of an irregularly interstratified illite–HIV mineral. The common occurrence of ...
Adelaide Research & Scholarship: Randomly interstratified …
Randomly interstratified illite-vermiculite from weathering of illite in red earth sediments in Xuancheng, southeastern China: Author: Hong, H. Churchman, G. Yin, K. …
Nature of Interstratified Kaolin-smectites in Some …
The clay minerals in the < 2 µm, and finer, size fractions of several horizons from each of five Australian soils of different types and from different locations have been analysed by X-ray diffraction, infrared spectroscopy, transmission electron microscopy and X-ray fluorescence. Samples from each profile contained a phase in which layers of smectite …
Mixed-layer illite-vermiculite as a paleoclimatic …
I/V and I/S are metastable intermediate phases that would be more responsive to weathering and climate change than the end members V and S, as well …
Mixed-layer illite-vermiculite as a paleoclimatic indicator in …
The mineralogy and chemical composition of the Jiujiang red soil sediments were investigated using X-ray diffraction (XRD), X-ray fluorescence (XRF), and inductively coupled plasma mass spectrometry (ICP-MS). Mixed-layer illite–vermiculite (I/V) was confirmed based on the conditions that a broad peak of 1.0 to 1.4 nm appeared in XRD …
INTER STRATIFIED CLAY MINERALS AND …
INTERSTRA TIFIED CLAY MINERALS AND WEATHERING PROCESSES 115. identical to that of randomly interstratified illite-smectite with 70% smectite layers (Fig. 10). The results show that the clay consists primarily of loA (smectite) and 20A (illite) thick particles in the appropriate proportions (Fig. 10). 40. %20.
. Mineralogy and Genesis of Mixed-Layer Illite-Vermiculite …
Hong, H; Churchman, G Jock; Yin, K; Li, R; Li, Z 2014: Randomly interstratified illitevermiculite from weathering of illite in red earth sediments in Xuancheng, southeastern China Geoderma 214-215: 42-49
Significance of random illite-vermiculite mixed layers in …
Significance of random illite-vermiculite mixed layers in Pleistocene sediments of the northwestern Atlantic Ocean - Volume 35 Issue 4 ... to detrital supply through erosion of high-latitude continental areas from which they are derived mainly from chemical weathering of micaceous phyllosilicates. ... Randomly interstratified illite ...
