Working techniques[ edit ] Alabaster is mined and then sold in blocks to alabaster workshops. The effect of heating appears to be a partial dehydration of the gypsum. If properly treated, it very closely resembles true marble and is known as “marmo di Castellina”. In this way a very misleading imitation of coral that is called “alabaster coral” is produced. Types, occurrence, history[ edit ] A calcite alabaster perfume jar from the tomb of Tutankhamun , d. This was the case with small flasks of the alabastron type made in Cyprus from the Bronze Age into the Classical period. Calcite alabaster[ edit ] Calcite dish from the Ancient Egyptian tomb of “U”, Semerkhet Calcite alabaster, harder than the gypsum variety, was the kind primarily used in ancient Egypt and the wider Middle East but not Assyrian palace reliefs , and is also used in modern times. It is found as either a stalagmitic deposit from the floor and walls of limestone caverns , or as a kind of travertine , similarly deposited in springs of calcareous water. Its deposition in successive layers gives rise to the banded appearance that the marble often shows on cross-section, from which its name is derived: The Greek name alabastrites is said to be derived from the town of Alabastron in Egypt , where the stone was quarried.
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Gypsum Stromatolites From Sawda Nathil: Six to eight thousand years ago, these depressions were marine embayments that separated the peninsula of Qatar from the mainland. These embayments in-filled rapidly with dune sands, blown southeastward across Qatar. Since then, they have become progressively more evaporitic. Inland depressions like Sawda Nathil host a set of unique environments within Qatar. Most depressions are close to or below sea level, resulting in near-surface water tables in the driest parts of Qatar.
Evaporation to salt saturation creates thick gypsum and halite crusts sabkhas , as well as shallow hypersaline ponds salinas with spectacular microbial gypsum stromatolites. The present ground surface is a mosaic of relict marine facies, deflated dune sands, and inland sabkhas and salinas. Core material of four short push cores was photographed, sedimentologically described, and sampled for petrographic thin-section and X-ray diffraction XRD analyses. Scanning electron microscopy SEM was used to characterize samples from a gypsum stromatolite.
Radiocarbon dating of marine shells provides ages of approximately un-calibrated 14C years before present yr BP , coinciding with a well-documented sea-level highstand, approximately 2 to 4 meters higher than present. During that time, Qatar was mostly an island, only connected in the South with the Arabian Peninsula by a narrow isthmus. SEM examination of gypsum stromatolites show gypsum crystals developing in close spatial association with microbial biofilms.
Whether this is a purely passive microbial-influenced gypsum mineralization process or an example where microorganisms actively control the mineralization process in order to obtain ecological advantages, remains to be evaluated.
Global Gypsum Conference and Exhibition – Programme
Despite its relevance, the paleoseismic record of this region is scarce, hampering our understanding about the relationship between the Andes building and earthquake occurrence. In this study, we used the U-series disequilibrium method to obtain absolute ages of paleoearthquake events associated with normal displacements along the active Mejillones and Salar del Carmen faults in the Coastal Range of the Atacama Desert of northern Chile.
The Th— U disequilibrium ages in co-seismic gypsum salts sampled along the fault traces together with marine evidences indicate that earthquakes occurred at ca. When coupled with paleoseismic marine and radiocarbon 14C records in the nearby Mejillones Bay evidencing large dislocations along the Mejillones Fault, the geochronological dataset presented here is consistent with the notion that gypsum salts formed during large earthquakes as a result of co-seismic dilatancy pumping of saline waters along the major faults.
Based on maximum observed cumulative vertical offsets in the studied faults, this phenomena could have occurred episodically at a rate in the order of 1:
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Address of the park is: The grand opening of the park was held October 5, View photos in the Image Gallery. Sited on hundreds of acres of land formerly mined for gypsum, the Park will provide a high quality riding experience to users within a regulated riding area. Since , a dedicated alliance of individuals and groups have been working with local and state officials; gypsum company representatives; and user groups to see the Park through to fruition.
With the consultation of Shive-Hattery, a master planning process was followed and several phases of development were identified.
Global Gypsum Conference and Exhibition
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Working techniques[ edit ] Alabaster is mined and then sold in blocks to alabaster workshops. The effect of heating appears to be a partial dehydration of the gypsum. If properly treated, it very closely resembles true marble and is known as “marmo di Castellina”. In this way a very misleading imitation of coral that is called “alabaster coral” is produced. Types, occurrence, history[ edit ] A calcite alabaster perfume jar from the tomb of Tutankhamun , d. This was the case with small flasks of the alabastron type made in Cyprus from the Bronze Age into the Classical period.
Calcite alabaster[ edit ] Calcite dish from the Ancient Egyptian tomb of “U”, Semerkhet Calcite alabaster, harder than the gypsum variety, was the kind primarily used in ancient Egypt and the wider Middle East but not Assyrian palace reliefs , and is also used in modern times. It is found as either a stalagmitic deposit from the floor and walls of limestone caverns , or as a kind of travertine , similarly deposited in springs of calcareous water.
Its deposition in successive layers gives rise to the banded appearance that the marble often shows on cross-section, from which its name is derived:
Rub’ al Khali
This park has been founded in by the Province of Ravenna and by the cities of Faenza and Brisighell, after the purchase of an abandoned estate, 20 km wide, partly woods and partly ex-arable land. The Park presents a wavy landscape, with rocky outcrops, dolines, sinks and caves, covered with a mixed vegetation that is spontaneously going back to its original nature.
In this area there are many karst hollows, most of them of vertical structure, some still unexplored. The Park pursues and supports the recovery of the original nature of the site, with the priority objective to protect and preserve the area. The Park is also a perfect stage for educational activities, excursions and stays and a great opportunity to increase respect and care for nature. The chalky rock has unusual properties which have favoured the creation of a typical morphology, with a peculiar microclimate and flora.
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We are no longer accepting registration for this event Share this event: The conference in will meet in fabulous Vancouver and will appeal to gypsum and wallboard producers from around the globe. Strong delegate groups are expected to attend from the Americas and from Asia, as well as from around the rest of the world. A company called Exhibition Housing Management has been contacting delegates trying to prompt them to make their hotel booking with them. This is a scam.
Please make your hotel bookings directly. Do not give anyone your credit card details over the phone. Full details of this conference can be found at www. For more information on exhibiting or sponsorship opportunities at the conference and exhibition, please contact Paul Brown at paul. Due to the constraints of the registration system, a new registration form must be completed for each delegate.
Guests can attend the gala dinner only. Each registration must have its own unique e-mail address. Registering a group more than 3 people?
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These lakes existed during periods from 6, to 5, years ago and 3, to 2, years ago. The lakes are thought to have formed as a result of “cataclysmic rainfall” similar to present-day monsoon rains and most probably lasted for only a few years. However, lakes in the Mundafen area in the southwest of the Rub’ al Khali show evidence of lasting longer, up to years, due to increased runoff from the Tuwaiq Escarpment.
First dating of the paleoseismic activity along the Mejillones fault is presented. We used U-Th series in gypsum, submarine radiocarbon and high resolution seismic. The last large earthquake occurred close to ± ka. It was a coetaneous event along the Salar del Carmen fault, Atacama Fault ://
Many lakes have endogenic precipitation of calcium bearing minerals that allow for substitution by uranium within their crystal structures. Changes in regional climate due to suspected shifts in the ITCZ over the past 85, years resulted in both calcite and gypsum deposition, especially during drier periods Hodell et al. Both precipitates incorporate uranium from the lake water and can be used for U-Th dating.
U-Th dating is problematic in lake systems for several reasons: Contamination is a primary issue because of the difficulty of separating the precipitates from the sediment. Despite these concerns, U-Th dating of lake sediments has the potential to be successful with careful selection of precipitates and thorough analysis of the precipitate, the lake system, and the diagenetic environment.
However, the samples have high background thorium levels, indicating the necessity of using the U-Th total sample dissolution isochron dating method as described by Ku, to quantify authigenic thorium. Journal of Paleolimnology 19, Scientific Drilling 3, AGU Reference Shelf 4,
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Dealing with gypsum karst problems: Editor in Chief , Frumkin, A. He joined the British Geological Survey in as a geological surveyor mapping Permian Zechstein Group and Triassic rocks including evaporites and the overlying Quaternary deposits in Yorkshire.
· Speed-dating: Bring plenty of business cards for this popular networking session Coffee and networking in the Global Gypsum exhibition area: Sponsored by Johns
Hope you enjoyed this roundup…and… Happy New Year!!! TSA Screening Cards for Ostomates and those with Health Conditions Yesterday, the Transportation Security Administration TSA approved of a solution to help passengers with medical conditions such as Ostomy discreetly inform staff of their condition to avoid any potential communication issues. These cards merely state that you have a medical condition that may affect the screening: I have the following health condition, disability, or medical device that may affect my screening: I understand that presenting this card does not exempt me from screening.
This card allows you to describe your health condition, disability, or medical device to the TSA officer in a discreet manner.
Global GypSupply Conference & Exhibition
Both are characterized by being creamy to snow white in color, and they have been used in carving, ornaments, and ornamental statuary for centuries. The ancients favored calcite alabaster, a very hard form of calcium carbonate. This stone was originally imported from Egypt, a country which also produced a number of works of art using this mineral.
North American Glass Mat Gypsum Panels Construction Specifications Institute Masterspec Classification The product group consists of interior and exterior gypsum panels products as defined by ASTM C/CM Standard Specification for Glass Mat Gypsum Substrate for Use as Sheathing, ASTM.
Traditional Lime Plaster Myths, Preconceptions and the Relevance of Good Practice In recent years, investigations carried out during repair and restoration work have led to a significant increase in our knowledge of the techniques used in early plasterwork, but little is documented. Ian Constantinides examines the use of traditional lime plaster and explodes some popular myths and misconceptions. The chapel gallery ceiling While the stylistic development of plasterwork through the ages is well documented, the history of pre-Victorian plastering technology is relatively little researched.
Sources lack real detail on the craftsman’s materials and methods of working. Millar’s authoritative textbook, ‘Plastering Plain and Decorative’ is a bible to most, but is limited in that it describes state of the art lime plastering relevant only to Victorian and Edwardian work. In recent years, our understanding of this earlier work has increased considerably. While the conservation, repair and renewal of historic plasterwork has lagged behind that of stone, fewer horror stories are heard.
It doesn’t require a particularly sensitive eye to see how uncomfortably the skilled, but uniformly repetitious repair work of the fibrous plasterers compares with the original, in situ, hand work of an early Jacobean ceiling, and the wholesale replacement of solid plasterwork by fibrous plaster is now less common. But it is less evident how changing materials and techniques can effect the structural integrity of historic plasterwork. The addition of gypsum, for example, which sets rapidly on addition of water, radically affects the working time and consequently the decorative treatment, as well as the set itself.
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Supplies of FGD gypsum will drop dramatically in the coming years as coal-fired power stations are progressively closed, and environmental and other regulations are curtailing the supply of some sources of natural gypsum. Some bulk gypsum suppliers are curtailing exports to focus on domestic markets. Recycling is becoming a potentially significant new source of raw materials. Given these changes in the markets, gypsum users wallboard and plaster manufacturers, cement producers and agricultural users are likely to seek new supplies and new suppliers of their crucial raw materials.
Buyers and traders of gypsum are expected to attend.
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We do not know exactly when the village was founded. Bricks discovered in the original enclosure wall were stamped with the name of Tuthmose I, although Queen Ahmose-Nefertari and her son Amenhotep I of early Dynasty XVIII were revered by the inhabitants, suggesting that its origins may have been earlier. A cult temple of Amenhotep I was situated at the northern end of the village. Little is known about the earliest settlement here, which was destroyed by fire, but later during the reign of Horemheb the houses were restored and the village expanded.
The site has yielded a huge amount of information about the daily lives of the inhabitants, their families and relationships, as well as their working and living conditions. A great deal of textural material in the form of papyri and ostraka large flakes of limestone or pottery sherds used for sketches and jottings have been found, making it possible for archaeologists to outline detailed reconstructions of the social and industrial organisation of the settlement.
It is thought that the pit was originally dug by the villagers in search of water. Such settlement sites are rare. There have been discoveries of similar communities at Giza, dating from the Old Kingdom and Kahun, from the Middle Kingdom, which together with Deir el-Medina enables us to build a more complete picture of the lives of the common people of ancient Egypt. It occupied an area of around two hectares, with seventy dwellings enclosed within the original walls and about fifty more outside during the Ramesside period.
The residential area was approached from the northern end where a well was located and had a broad central street running north to south with houses on either side.