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Stratigraphy and biostratigraphy (charophytes) of the ...

This unit, defined by Travé (1992) and Travé et al. (1996), is made up of sandstone, anoxic marl, limestone including freshwater stromatoliths, and gypsum, representing the progressive filling ...

(PDF) INTERNATIONAL MARITIME SOLID BULK CARGOES …

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(PDF) Evolution in the use of natural building stone in ...

limestone and dolostone, were used to build most of the canal. In the nineteenth century, the use of natural stone in Madrilenian monuments underwent yet another major change, driven in this

oficina70 : Mineral Resources and Gemstones in Nigeria

2021-10-13 · Gemstones are one of the important mineral resources in Nigeria found and exploited heavily in Plateau, Kaduna and Bauchi. sapphire, ruby, aquamarine, emerald, tourmaline, topaz, garnet, amethyst, zircon, are some of the Gemstones in these …

Deterioration caused by dimensional change in stone (EBD ...

2018-11-1 · Finally, there is a set of three stones that have been chosen for presenting the morphology of deterioration typical of EBD pathology, and for being different (in terms of age, origin and composition) from Campanil limestone; "Bernués Stone" (Spain), "Silos …

Material characterization and restoration of mural ...

2021-2-18 · shales and mudstones. Further, Eocene Limestone plateau contributes largely not only in the Dakhla Oases, but in the whole Western Desert. In Figure 2, the geological structure of the hills is clearly observed. It is noticed that the rock is characterized with laminae interventions of gypsum and anhydrite (Helmi 2000). Besides, the occurrence ...

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Boletin geología del cuadrangulo del cusco

The Yuncaypata Group (mid- upper Cretaceous) is made up of shale, gypsum, limestone and sandstone of the Paucarbamba, Maras, Ayabacas and Puquin Formations. Then, there are shale and sandstone of the Quilque and Chilca Formations from the …

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Groundwater flow patterns in the San Luis Valley, Colorado ...

2006-11-10 · Groundwater systems in the San Luis Valley, Colorado, USA have been re-evaluated by an analysis of solute and isotopic data. Existing stream, spring, and groundwater samples have been augmented with 154 solute and isotopic samples. Based on geochemical stratification, three groundwater regimes have been identified within 1,200 m of the surface: unconfined, upper active confined, and …

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The presence of calcite in archeological ceramics ...

The temperature offset was based principally on consideration of Ortega et al. (2012b) and Barrett (2015), where the interpreted temperature differences between limestone/unburnt limestone and ...

The Geochemical Behaviour of Mine Tailings from the ...

2012-10-30 · Flotation tailings associated with the extraction of Pb and Zn in the Touiref mining district, Tunisia, contain galena, sphalerite, pyrite, and marcasite in a carbonate gangue. The geochemical behaviour of oxidized and unoxidised tailings were consistent with their mineralogical and chemical characteristics. The leaching proceeded under neutral to slightly alkaline condition (pH 7.3–8.5 ...

Differentiating between anthropogenic calcite in plaster ...

The increasing contribution of incompletely burnt limestone to the lime binder with increasing grain size is observable in the age profiles but also finds support in the ratio of the infrared ...

(PDF) Los revocos de Medina Azahara. Parte I ...

aguas de lluvia lo es en los morteros que contienen yeso. ... mortars, while in mortars made of gypsum, decay is a result . ... amount of limestone aggregate is small.

(PDF) Carbonatos Metanógenos y Pirita Framboidal ...

cies que contienen azufre es mucho. mayor ju sto en el límite redox, por lo que. la pirita fr amboidal que crec e en las pro-ximidades de dicho límite adquiere los.

Geochemical Behavior of Mine Tailings and Waste Rock at ...

2013-3-5 · The abandoned Azegour mine is located in the High Atlas Mountains of Marrakesh (Morocco), and was mined for Cu, Mo, and W. About 850,000 t of waste rocks and tailings were deposited on the surface and have been exposed to weathering for 40 years. The remaining acid-producing potential (AP), acid-neutralizing potential, and geochemical behavior of the Azegour Cu-and Mo-rich tailings were ...

The Potential Use of Phosphatic Limestone Wastes in the ...

2013-3-28 · In Morocco, there are many sedimentary phosphate mines that produce large quantities of phosphatic limestone wastes (PLW) that contain calcite (46 wt%) and dolomite (16 wt%). These mines are located near contaminated sites, such as the abandoned Kettara pyrrhotite mine. The surface drainage water at the Kettara mine site has a pH of 2.9–4.2 and elevated concentrations of SO4 (from …

Karst groundwater in UNESCO protected areas: a global ...

2020-7-27 · Recent studies have clarified the global distribution of carbonate and evaporite karst and global utilisation of karst waters. This study provides an initial assessment of the extent to which UNESCO protected area designations cover areas with karst (carbonate and evaporite), and hence the groundwaters that they contain. There are four UNESCO protected area designations: Biosphere …

Cement

Cement is a fine powder, obtained from the calcination at 1,450°C of a mix of limestone, clay, and iron ore. The product of the calcination process is clinker—the main ingredient of cement—that is finely ground with gypsum and other chemical additives to produce cement.

CRETACEO INFERIOR

The l.ower Aptian consists of shaly clays wilh sorne thin limestone intercalations. lts uppermost portion is rather rich in thin gypsum veines. Ammonitcs were found in the li­ mestone layers and are abunclant in limestone concretions within the c!ays. Deshayesites, Cheloniceras, Lytoceras characterize this zone.

1904 2004 M C i e n A ñ o s Upper Jurassic (Lower ...

M E XI CA N A A. C. S O C I E D A D G E O L Ó G I C A 1904 2004 C i e n A ñ o s Boletín de la Sociedad GeolóGica Mexicana VoluMen 63, núM. 2, 2011, p. 313-321 Upper Jurassic (Lower Kimmeridgian-Olvido) carbonate strata from the La Popa Basin diapirs, NE Mexico

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(PDF) Diagnosing stone decay in built heritage. Facts and ...

Swollen and cracked limestone (Egyptian stela) after immersion in water (27). ... mm contienen zonas con distintas tonalidades de ... (containing about 10% gypsum) from architectu-ral elements ...

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