نتایج جستجو برای: smectites
تعداد نتایج: 240 فیلتر نتایج به سال:
The bentonites of Aftar region, with average of 15 meters thickness and about 10 km long, are volcanoclastic sequence of Semnan Formation that formed in a shallow sea water environment. Based on the field, XRD data, microscopic and scanning electron microscopic (SEM) studies, as well as chemistry, the bentonite beds contain zeolites (clinoptilolite and mordenite), gypsum, calcite, celestine, op...
Layer charge is one of the key parameters used for the characterisation of expandable clay minerals, smectites. It determines most significant properties of the material which are important from the industrial application point of view. This work is related to a novel method introduced to characterize the layer charge of smectites, based on using cationic organic dyes as molecular sensors. One ...
The objective of this work was to investigate and demonstrate the pozzolanic properties bentonites found at San José–Los Escullos deposit, located in southeast Iberian Peninsula, be used manufacturing more durable environmentally compatible cements, mortars concretes. These are mainly composed smectites, with montmorillonite as main clay mineral. They were formed by hydrothermal alteration tuff...
Nontronites are the ferric members of dioctahedral smectites, most of which are structural counterparts of beidellite (Brindley, 1980). The existence of a cont inuous b e i d e l l i t e n o n t r o n i t e series was suggested on the basis of chemical analyses by Ross & Hendricks (1945). However, a nontronite with montmorillonitic structure has been described by KSster (1982). Minor amounts of...
The swelling-shrinkage behavior of smectites induced by interlayer uptake or sorption CO 2 and H O has been investigated with increasing interest recent years, primarily because its potential impact on the sealing efficiency clay-bearing caprocks overlying storage reservoirs. To get a better understanding stress-strain-sorption coupling in smectite exposed to supercritical , we performed multip...
[1] The Noachian terrain west of the Isidis basin hosts a diverse collection of alteration minerals in rocks comprising varied geomorphic units within a 100,000 km region in and near the Nili Fossae. Prior investigations in this region by the Observatoire pour l’Minéralogie, l’Eau, les Glaces, et l’Activité (OMEGA) instrument on Mars Express revealed large exposures of both mafic minerals and i...
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