Open AccessBook
The x-ray identification and crystal structures of clay minerals
Reads0
Chats0
About:
The article was published on 1961-01-01 and is currently open access. It has received 966 citations till now. The article focuses on the topics: Clay minerals.read more
Citations
More filters
Journal ArticleDOI
Sedimentology and mineralogy of surficial bottom deposits from the Aegean–Çanakkale–Marmara transition (Eastern Mediterranean): effects of marine and terrestrial factors
TL;DR: Grain size, carbonate and XRD-mineral data of surficial shelf sediments from 113 stations in the Aegean-Marmara-transition revealed the presence of three distinctive sectors which were controlled by the changing morphologic, hydrodynamic, benthic and terrigenous conditions that lasted during the late Quaternary as mentioned in this paper.
Journal ArticleDOI
Combined Lime-Cement Stabilization for Longer Life of Low-Volume Roads
Abstract: Low-volume roads are an important part of the world's transportation infrastructure and a direct cause of the socioeconomic development of small city and rural communities. Construction, maintenance, and rehabilitation of these roads are major tasks and require a major part of the public works budget. Better design and construction methods can prolong pavement service life and result in lower maintenance and rehabilitation costs. This paper presents a research study done for the city of Arlington in north Texas to stabilize road subsoils with a combined lime and cement stabilizer, which in turn is expected to enhance service life of the roads. Both laboratory tests on stabilized soil mixtures and field performance data are analyzed and presented.
Journal ArticleDOI
Clay minerals as an index of the degree of metamorphism of the carbonate and terrigenous rocks in the South Wales coalfield
Abstract: Illite, illite-montmorillonite (I-M) mixed layer, kaolinite and chlorite are the principal clay minerals identified in the carbonate and terrigenous carboniferous rocks in the South Wales coalfield. Mineralogic changes and illite crystallinity are the main modifications in the studied rocks. Progressive illitization of I-M mixed layers (decrease in their expandabilities) towards the western part of the coalfield (i.e. in the direction of increase in coal-rank and grade of metamorphism), and the development of vermicular kaolinite, dickite, allevardite and pyrophyllite in the anthracite area are the main mineralogic changes. Illite crystallinity was determined by Weaver's sharpness ratio (S.R.) and isosharpness ratio maps of illite in the carbonate and terrigenous rocks are produced showing a gradual increase in illite crystallinity towards the west. Illites in the terrigenous rocks tend to be aluminous (evidenced by the increase in their intensity ratios, ‘I.R.’) with increase in coal-rank and grade of metamorphism towards the west. These changes are controlled to some extent by lithology. Correlation of illite S.R. with either its I.R. or expandability of I-M mixed layer, has outlined two diagenetic zones in the coalfield: zone I, the Diagenetic zone, in the eastern and southern regions; and zone II, the Metadi-agenetic zone, covering the central and northern parts of the central region. The Anchimetamorphic zone (zone III), which corresponds to the anthracite area in the northwestern region, was differentiated by correlating the illite S.R. with coal-rank. The occurrence of the above mentioned diagenetic zones and modifications of the clay minerals in the carboniferous rocks of the South Wales coalfield are mainly lateral without variation with increase in depth.
Journal ArticleDOI
Changes induced by the roots of Erica arborea L. to create a suitable environment in a soil developed from alkaline and fine-textured marine sediments
TL;DR: In this article, the authors report on the modifications induced by the roots of Erica arborea L. on a soil derived from alkaline and fine-textured marine sediments.
Journal ArticleDOI
Determination of chlorite compositions by x-ray spacings and intensities
TL;DR: In this article, the cell dimensions and compositions of four chlorites whose crystal structures have been determined in detail are used to test existing graphs and regression equations designed to give tetrahedral and octahedral compositions.