Basaltic lavas provide a window into their mantle sources and the associated geodynamic processes associated with them. Obtaining absolute chronology on young basalt flows is often challenging. We demonstrate the technique using cave crusts from four young basalt flows in El Malpais National Monument, New Mexico, three of which are moderately well-dated by alternative methods 14 C, 36 Cl, and 3 He ages. They all exhibit well-formed lava tube systems that contain gypsum crust speleothems interpreted to be remnant of the volcanic sulfur or sulfate processes when the tube systems were active during their terminal stages. Analyses of gypsum from caves of two well-dated basalt flows yielded uranium-series ages that agree with the ages determined by other techniques showing that absolute ages of young basalt flows can be achieved by this method. The fourth flow, the Hoya de Cibola basalt, previously undated by other absolute means has a U—Th gypsum crust isochron age of
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Archaeological countries have actually drawn attention to the presence of plasters and decorations using gypsum dating as far back as BC. During the restructuring of the cathedral of Notre Dame in Paris gypsum sheets have come to the light for masonry use dating back to the third century AD. The common use of gypsum sheets for the realization of walls goes back as far as the beginning of the 18th century.
Here we propose uranium-series dating of these ‘speleogenetic’ gypsum crusts as a way to establish the ages of young basalt flows.
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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. Radiocarbon dating of this type is possible provided there is sufficient amounts of wood, charcoal or other plant remains that can be found.
The accuracy will depend on what organic materials are extracted, and if they were contemporary to the time of the construction.
COBISS: Preliminary U/Th dating and the evolution of gypsum crystals IN Naica caves (Mexico) Predhodni rezultati datiranja z metodo U-Th in razvoj.
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: Journal Article
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.
Evaporites such as sulfate, halite and nitrate salts accumulate in (hyper-)arid regions such as the Atacama Desert. In widespread areas, gypsum (or anhydrite) is.
Origin and evolution of gypsum endemic floras package
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Preliminary U/Th dating and the evolution of gypsum crystals in Naica caves (Mexico). Sanna Laura, Forti Paolo, Lauritzen Steinerik. Abstract: The origin and the.
To browse Academia. Skip to main content. Log In Sign Up. Download Free PDF. Laura Sanna. Rezultati produced a coarse chronological interval of growth. Keywords: U-Th dating, gypsum speleothems, mine caves, crystal growth rate, Naica, Mexico. In , a multidis- been constant over time was still to be investigated. Even though collected for dating purposes. A U and Th extraction some of this research has already brought important procedure using isotope dilution for radiometric dating scientific results Bernabei et al.
Naica samples and their relationship with the local evolu- ; Forti et al. Experimental observations Besides the wide desolate landscape around the Sierra Swords Cave , and all of those host euhedral gypsum de Naica Chihuahua, Mexico , small amazing geologi- crystals for which post-depositional alteration and open cal secrets Foshag ; Shagun ; London systems – necessary conditions for dating purposes – are are hidden inside this anticline structure of Cretaceous excluded.
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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.
Return to Article Details Preliminary U/Th dating and the evolution of gypsum crystals in Naica caves (Mexico) Download Download PDF. Thumbnails Document.
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. J Environ Radioact 99 2 — Gorecka H, Gorecki H Determination of uranium in phosphogypsum. Talanta 31 12 — J Environ Radioact — Earth Sci Rev —