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Uranium-series dating of gypsum speleothems: methodology and examples. L Sanna, F Saez, S Simonsen, S Constantin, JM Calaforra, P Forti, International.
This is a private group. To join you must be a registered site member and request group membership. Purpose Understand the origin and evolution of gypsum endemic floras worldwide from a phylogenetic perspective. Scope This WP will focus on those regions with better background floristic knowledge of gypsum endemic plants, namely Spain, the Chihuahuan Desert, Turkey, Iran and Australia.
Task 2. We will start by doing a thorough literature and web database including GenBank review, searching all available information for the different floras under study. For each gypsum floristic region indicated for WP-2, we propose to reconstruct comprehensive species-level phylogenies for key gypsum endemic lineages and their closest non-endemic relatives sampling comprehensively from the entire genus in small genera and from relevant subclades within larger genera. Given the goals and global scope of the project, we will sequence a mix of the nuclear internal transcribed spacer ITS and plastid spacer regions for each plant group, which will be sufficient to determine the phylogenetic placement of each gypsum endemic lineage with respect to its closest relatives.
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Gypsum – this non toxic mineral, that was formed in nature millions of years ago, is and will increasingly benefit humans, animals, plants and environment. From chemical point of view gypsum is calcium sulfate, which crystallizes when associated with water and represents a very soft mineral with chemical formula CaSO42H2O. First gypsum deposits were formed more than million years ago by evaporation of seawater pools on equal ground.
The material began to be used by people in the construction and decoration in the form of plaster and alabaster before BC. Gypsum plaster was discovered at Catal-Huyuk in Asia on underground fresco and in Israel were discovered gypsum screeds dating from BC, and also in the construction of the towers at Jericho.
Also, (ESR) was used to date the formation or most recent recrystallization of that gypsum. The gypsum derivative (ESR) spectrum is.
Official websites use. Share sensitive information only on official, secure websites. The long term stability and reliability of the luminescence signal for gypsum has not been well documented or systematically measured until just recently. A review of the current literature for luminescence dating of gypsum is compiled here along with original efforts at dating an intact and in-situ bed of selenite gypsum at Salt Basin Playa, New Mexico and Texas.
This effort differs from other documented luminescence dating efforts because the gypsum is not powdery or redistributed from its original growth patterns within the playa basin but is instead of a crystalline form. Sixteen ages from eight cores were ultimately produced with seven of the ages coming from rare detrital quartz encased in or with the gypsum crystals while the remaining ages are from the crystalline gypsum.
As far as can be ascertained, the quartz was measured separately from the gypsum and no contaminants were noted in any of the aliquots. Some basic and preliminary tests of signal stability were measured and found to be mitigated by lessening of pre-heat protocols. Ages ranged from 8 ka to 10 ka in the shallow cores and 16 ka to 22 ka in the deeper cores.
These ages will be useful in determining rates of gypsum growth within a sequence of evaporates which, in turn, will help to better document historic rates of evaporation and thus estimate, with more precision, the corresponding annual evaporation rates.
Moisture Analysis of Gypsum
Recent analyses have proven that a traditionally-made gypsum plaster is consistently employed on these figures and on archaeological stuccoes. This figure also displays integrated restoration of the first half of the twentieth century, including additions in a more refined gypsum, and modern pigments some of the reds and synthetic ultramarine blue. Public Domain. This artwork is meant to be viewed from right to left.
Description. Gold Bond® BRAND Fire-Shield® Gypsum Board consists of a fire- Job Name: Contractor: Date: Submittal Approvals: (Stamps or Signatures). 1.
Jump to navigation. If the testing indicates that it does not contain asbestos, the Comox Valley and Campbell River Waste Management Centres will accept the drywall for recycling. If the pre drywall does not have mud, it can be disposed with regular drywall for recycling. Haulers will be required to provide analytical data or proof with their application to show that drywall is free from asbestos or show the material does not have mud compound.
The following steps must be completed for the acceptance of asbestos free drywall material at the Comox Valley and Campbell River waste management centres:. The drywall and paper are separated and reused or recycled for a variety of purposes, including composting or manufacturing new sheets of drywall.
The clean gypsum core material is then sold back to manufacturers. New wallboards typically contain about 15 – 20 per cent recycled content.
Origin and evolution of gypsum endemic floras package
The age and origins of arid adaptations and gypsum endemism in Nyctaginaceae inferred using relaxed molecular dating. Islands of exposed gypsum are scattered throughout the Chihuahuan Desert region of northern Mexico and the southwestern US. Although gypsum forms a hard crust and is generally low in nutrients, many plant species have adapted to grow on this substrate, with some fully restricted to it. Morphological, phylogenetic, and biogeographic evidence suggest that clades of gypsum endemics exist, and that some of these groups may have originated as early as the late Miocene.
If true, these endemics must have persisted throughout the Pleistocene full-glacial periods, when the Chihuahuan Desert was largely replaced by grassland and savanna.
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It is a very soft mineral and it can form very pretty, and sometimes extremely large colored crystals. Massive gypsum rock forms within layers of sedimentary rock, typically found in thick beds or layers. It forms in lagoons where ocean waters high in calcium and sulfate content can slowly evaporate and be regularly replenished with new sources of water. While the majority of gypsum produced in North America is used to manufacture wallboard, gypsum can also be used:.
Gypsum is a mineral found in sedimentary rock formations in a crystalline form known as calcium sulfate dihydrate. One hundred pounds of gypsum rock contains approximately 21 pounds or 10 quarts of chemically combined water. Gypsum rock is mined or quarried and then crushed. The calcined gypsum or hemihydrate becomes the base for gypsum plaster, wallboard and other gypsum products.
Challenges of working with gypsum
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Gypsum Mining In Nagore.
Skip to search form Skip to main content You are currently offline. Some features of the site may not work correctly. DOI: Sanna and F. Simonsen and S. Forti and S. Sanna , F. The analytical problems of dating gypsum speleothems with the U-series technique are reviewed. Gypsum speleothems are, in general, very low in U content, challenging the limits of detection methods. Various approaches to dissolving gypsum and isolation of actinides from the matrix include ion-pairing dissolution with magnesium salts and using nitric acid.
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Taking the necessary measures to maintain employees’ safety, we continue to operate and accept samples for analysis. Pretreatment — It is important to understand the pretreatment applied to samples since they directly affect the final result. You are welcome to contact us to discuss the pretreatment or request that we contact you after the pretreatment and prior to dating.
To date, there is a lack of information regarding the dating potential of calcite speleothems that have grown in such gypsum karst environment (e.g. no pseudokarst).
Despite its versatility, early quantities were limited, and further advancement was needed to make it a viable replacement for more established building materials. This changed however following the mass structural devastation of WW II, when Western Europe was in dire need of materials and resources to rebuild. The wallboard industry exploded as demand for this product grew. Recently, demand for wallboard has decreased, pushing the industry toward rapid innovation required to provide a high quality product at a low cost to consumers.
To address this issue manufactures have started to recycle products that were previously scrapped due to failures in the manufacturing process. Additionally, wallboard is now being reclaimed from building destruction sites and mixed with unused gypsum to make new products. These innovations reduce raw material costs, but requires more monitoring of manufacturing processes, and quality checks prior to materials being brought to market.
Drywall (Gypsum) Diversion
Mentioned in? References in periodicals archive? Analysing gypsum mortar connecting that slab to the bedrock allowed them to determine its age, dating it to AD. Researchers date discovery of Christ’s tomb in Jerusalem to Roman era.
An ancient gypsum quarry is situated at Umm el-Sawan in the northern Faiyum (f) Stockpile of alabaster blocks possibly dating to the Graeco–Roman Period.
The present paper describes a relatively simple, effective, very selective and economic method for the determination of uranium in calcite and phospho gypsum samples. The analysis is performed by alpha-spectroscopy after dissolution of the samples in Na 2 -EDTA solution, uranium separation by cation-exchange and its electrodeposition on stainless steel discs.
Moreover, the use of tracer solution U allows method evaluation and accurate uranium determinations. This is a preview of subscription content, log in to check access. Rent this article via DeepDyve. Lysandrou M, Pashalidis I Uranium chemistry in stack solutions and leachates of phosphogypsum disposed at a coastal area in Cyprus.