Petrography of roofing slates

Cárdenes, V.; Rubio-Ordóñez, A.; Wichert, Jörn; Cnudde, Jean; Cnudde, Veerle

doi:10.1016/j.earscirev.2014.07.003

Cited by 30 publications

(31 citation statements)

References 36 publications

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“…The resulting data (Table 2, Fig. 4) showed a typical mineral composition for a standard roofing slate (Cárdenes et al 2014).…”

Section: Petrographical Analysis and X-ray Diffractionmentioning

confidence: 95%

“…The slabs are split into tiles one by one, by a skilled worker, and then formatted with mechanical scissors according the market standards. There are several standards in the market, being the most popular rectangular models and German models, which have special shapes (Cárdenes et al 2014). Once the tiles are finished, they are carefully stacked in crates, ready for shipping.…”

Section: Mining Of Roofing Slatesmentioning

confidence: 99%

“…The values correspond to the mean of the data obtained during the years 2011 and 2012. These reference slates come from the Ordovician terrains of the Truchas Syncline, nowadays origin of most of the current slate production in the World (Cárdenes et al 2014).…”

Section: Normative Characterisationmentioning

confidence: 99%

“…Roofing slate is the commercial term for a group of natural stones which shares the characteristic of being able to split into thin, thick and plane tiles. There are many different rocks which may have these characteristics, such as shales, slates, sandstones, phyllites, schists and cinerites, among others (Cárdenes et al 2014). Nowadays roofing slate is the third natural stone traded in the world, just after carbonate rocks and granite (Fig.…”

Section: Introductionmentioning

confidence: 99%

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Technological characterisation of roofing slate from Nepal

Cárdenes

Neupane

Paudel

et al. 2016

Journal of Nepal Geological Society

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Roofing slate is a group of natural stones which can be split into thin, large and regular tiles. The world's slate market is the third in importance for natural stone, just after granite and marble. Most of the world's production of roofing slate is concentrated in Spain. There are new emerging countries (Brazil, China, India and Nepal) with huge resources of roofing slate. However, many of these resources are not yet well studied. Nepalese slate industry is still incipient, although most of the houses have been constructed using roofing slate since historic time. The representative three samples were taken for quality assessment from Tanahun and Baglung districts. From a geological point of view, the productive formations are the Benighat Slates and Nourpul Formation, but other formations are likely to be potential slate sources. Previous studies have shown an important reserve of slate which needs detailed investigation. Petrography and mineralogy of representative Nepalese slates are similar to the rest of the world's roofing slate. The test results showed values within the acceptance thresholds for roofing slates. This paper also compares the Nepalese slates with other varieties of roofing slates from Spain. Roofing slate industry of Nepal is promising, but still there are many points to improve. GEOLOGICAL CONTEXT AND SAMPLESThe Himalaya can be divided into five distinct morphogeotectonic zones from south to north (Stocklin 1980). From an economic point of view, the southernmost Terai Plain is potential for gravel, sand, groundwater, petroleum and natural gas. The Sub Himalaya is the potential area for construction materials, radioactive minerals, petroleum, natural gas and minor amount of coal. The Lesser Himalaya is potential for metallic and non-metallic minerals, gemstones, dimension stones (roofing slates) and voluminous construction materials.

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“…The resulting data (Table 2, Fig. 4) showed a typical mineral composition for a standard roofing slate (Cárdenes et al 2014).…”

Section: Petrographical Analysis and X-ray Diffractionmentioning

confidence: 95%

Section: Mining Of Roofing Slatesmentioning

confidence: 99%

Section: Normative Characterisationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Technological characterisation of roofing slate from Nepal

Cárdenes

Neupane

Paudel

et al. 2016

Journal of Nepal Geological Society

Self Cite

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“…ardoises, schistes ardoisičres, Czech štipatelné břidlice) is a technical term, referring to various types of shale or slate used for roofing. In Europe, the traditions of extracting and using slate as roofing materials are very strong [2]. The oldest documented examples of shale use come from Roman times; roofing slate was also widely used in the Middle Ages, and in the sixteenth century it was even exported.…”

Section: Introductionmentioning

confidence: 99%

Thermal parameters of roofing slates from Czech Republic

Labus

Bujok

2019

J Therm Anal Calorim

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Thermal performance of building materials is an important parameter from the point of view of energy consumption for heating buildings, which is obviously related to environmental protection standards. Thermal parameters of roofing slates were measured for samples from two different formations in the Czech Republic. These were rocks of lower Carboniferous Culm facies of Moravice Formation and Silesian Unit of Flysch Moravian-Silesian Carpathians. Thermal conductivity and thermal effusivity measurements were performed with use of TCi analyser. Thermal parameters were obtained in parallel and perpendicular direction to the bedding in rocks. Thermal conductivity of the Moravian slates in the direction perpendicular to the bedding ranges from 1.43 to 1.79 W m −1 K −1 , while for samples from Carpathian region this parameter ranges from 1.99 to 3.15 W m −1 K −1. High values of thermal conductivity correlate to higher quartz content in the rocks. The measured thermal parameters (conductivity, effusivity, diffusivity) are strongly depending on the direction of measurement. Thermal conductivity of analysed rocks increases along with increase in temperature. The increase in thermal conductivity value is more significant in case of Moravian slates. In practice, the obtained results indicate that the traditional building material, such as roofing slates, shows better insulation properties at lower temperatures, while in conditions of strong sunlight the temperature conductivity increases. In case of roofing slates, which tend to be highly anisotropic, the essential information is the direction of thermal parameters measurement. Slates, due to their specific texture, are characterized by a very high thermal anisotropy coefficient.

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Black shales and mesozonal quartz vein‐hosted Au: The Truchas Syncline, Spain and the Harlech Dome, Wales, a comparative study

et al. 2022

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A comparative study of quartz vein‐hosted gold occurrences associated with Palaeozoic metapelites in two areas of Wales and Spain combines new, previously unpublished and published data. Metamorphic grade is greenschist in both areas, but very low‐grade indicators in the host metapelites distance the environment from the greenschist/amphibolite transition zone required for some orogenic gold occurrences. Basin fertility for Au is indicated by the presence of auriferous pyrites in the protolith black shales in Spain. Only minor igneous activity has taken place in both study areas. Mineral parageneses are similar, with early sulphide phases characterized by As/Co and later auriferous phases by Cu/Pb/Zn sulphides. Mesozonal P–T conditions apply at deposition in both terranes. In Spain, mineralisation typically occurs in quartzites near to the metapelites, but not where the veins are in contact with them, and extensional faulting appears to be a stronger control over mineralisation than geochemical interaction with metapelite wall‐rocks. In Wales, both structural and geochemical factors (C content of the wall‐rocks and coupled oxidation of NH4 ions substituted in wall‐rock phyllosilicates to produce CH4 and N2) could have a role in Au deposition. In both areas, minor cross‐fault systems between larger faults are typical hosts of the mineralisation. Assignment is made to different subtypes of the orogenic gold model but these subtypes share the characteristic of a local source. This has implications for exploration methodology in epizonal/anchizonal metapelite‐dominated terranes, where indicators of basin fertility for Au within the protolith itself assume importance.

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Petrography of roofing slates

Cited by 30 publications

References 36 publications

Technological characterisation of roofing slate from Nepal

Technological characterisation of roofing slate from Nepal

Thermal parameters of roofing slates from Czech Republic

Black shales and mesozonal quartz vein‐hosted Au: The Truchas Syncline, Spain and the Harlech Dome, Wales, a comparative study

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