Applications of PGAA with Neutron Beams

Anderson, David L.; Kasztovszky, Zsolt

doi:10.1007/978-0-387-23359-8_6

Cited by 12 publications

(6 citation statements)

References 156 publications

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“…PGAA is especially useful for analyzing whole rock boron, chlorine and hydrogen concentrations. In contrast to other geoanalytical methods, sample preparation procedures are not needed, and hence contamination problems are eliminated (Anderson and Kasztovszky, 2004). Accuracy of trace element analyses by PGAA was checked by measurements of geological reference materials (Gmé-ling et al, 2005) and of natural samples (Marschall et al, 2005).…”

Section: Analytical Techniquesmentioning

confidence: 99%

The Lithium, Boron and Beryllium content of serpentinized peridotites from ODP Leg 209 (Sites 1272A and 1274A): Implications for lithium and boron budgets of oceanic lithosphere

Vils¹,

Pelletier²,

Kalt³

et al. 2008

Geochimica et Cosmochimica Acta

118

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Despite the key importance of altered oceanic mantle as a repository and carrier of light elements (B, Li, and Be) to depth, its inventory of these elements has hardly been explored and quantified. In order to constrain the systematics and budget of these elements we have studied samples of highly serpentinized (>50%) spinel harzburgite drilled at the Mid-Atlantic Ridge (FifteenTwenty Fracture zone, ODP Leg 209, Sites 1272A and 1274A). In-situ analysis by secondary ion mass spectrometry reveals that the B, Li and Be contents of mantle minerals (olivine, orthopyroxene, and clinopyroxene) remain unchanged during serpentinization. B and Li abundances largely correspond to those of unaltered mantle minerals whereas Be is close to the detection limit. The Li contents of clinopyroxene are slightly higher (0.44-2.8 lg g À1 ) compared to unaltered mantle clinopyroxene, and olivine and clinopyroxene show an inverse Li partitioning compared to literature data. These findings along with textural observations and major element composition obtained from microprobe analysis suggest reaction of the peridotites with a mafic silicate melt before serpentinization. Serpentine minerals are enriched in B (most values between 10 and 100 lg g À1 ), depleted in Li (most values below 1 lg g À1 ) compared to the primary phases, with considerable variation within and between samples. Be is at the detection limit. Analysis of whole rock samples by prompt gamma activation shows that serpentinization tends to increase B (10.4-65.0 lg g À1 ), H 2 O and Cl contents and to lower Li contents (0.07-3.37 lg g À1 ) of peridotites, implying that-contrary to alteration of oceanic crust-B is fractionated from Li and that the B and Li inventory should depend essentially on rock-water ratios. Based on our results and on literature data, we calculate the inventory of B and Li contained in the oceanic lithosphere, and its partitioning between crust and mantle as a function of plate characteristics. We model four cases, an ODP Leg 209-type lithosphere with almost no igneous crust, and a Semail-type lithosphere with a thick igneous crust, both at 1 and 75 Ma, respectively. The results show that the Li contents of the oceanic lithosphere are highly variable (17-307 kg in a column of 1 m Â 1 m Â thickness of the lithosphere (kg/col)). They are controlled by the primary mantle phases and by altered crust, whereas the B contents (25-904 kg/col) depend entirely on serpentinization. In all cases, large quantities of B reside in the uppermost part of the plate and could hence be easily liberated during slab dehydration. The most prominent input of Li into subduction zones is to be expected from Semail-type lithosphere because most of the Li is stored at shallow levels in the plate. Subducting an ODP Leg 209-type lithosphere would mean only very little Li contribution from the slab. Serpentinized mantle thus plays an important role in B recycling in subduction zones, but it is of lesser importance for Li.

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Section: Analytical Techniquesmentioning

confidence: 99%

The Lithium, Boron and Beryllium content of serpentinized peridotites from ODP Leg 209 (Sites 1272A and 1274A): Implications for lithium and boron budgets of oceanic lithosphere

Vils¹,

Pelletier²,

Kalt³

et al. 2008

Geochimica et Cosmochimica Acta

118

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“…The in-beam PGAA facilities located at research reactors can be used for panoramic analyses of a large variety of samples . With its nondestructive nature, PGAA can be used for the investigation of precious objects like archeological artifacts .…”

mentioning

confidence: 99%

Determining Elemental Composition Using Prompt γ Activation Analysis

Révay¹

2009

Anal. Chem.

157

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Prompt gamma-ray spectra sometimes contain hundreds of characteristic peaks, and the masses of the sample components can be determined from dozens of gamma-ray peak areas, some of which are affected by spectral interferences. Reliable qualitative and quantitative analyses can only be performed by using a precisely calibrated detector system, an accurate spectroscopic data library, high-quality spectroscopy software, and a sophisticated method to convert raw data into chemical composition. This article describes the steps of the chemical analysis with prompt gamma activation analysis (PGAA). A complete data reduction method has been constructed that handles the large number of spectral peaks using statistical procedures, identifies the chemical components based on statistical criteria, and determines the sample composition with a least-squares fit of the masses calculated from the individual peaks. The calculation of the uncertainties as well as the detection and analytical limits are discussed in detail. The validation of the method is also presented. The method can also be used in the evaluation of the results of other spectroscopic techniques.

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“…Activation Analysis [50] gives a comprehensive summary of the method development and its applications in various fields [69], [70]. The method has already matured in the 2000's.…”

Section: Prompt Gamma Activation Analysismentioning

confidence: 99%

Non-destructive analysis of metals and alloys using prompt gamma activation analysis and complementary methods

Maróti¹

2018

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Applications of PGAA with Neutron Beams

Cited by 12 publications

References 156 publications

The Lithium, Boron and Beryllium content of serpentinized peridotites from ODP Leg 209 (Sites 1272A and 1274A): Implications for lithium and boron budgets of oceanic lithosphere

The Lithium, Boron and Beryllium content of serpentinized peridotites from ODP Leg 209 (Sites 1272A and 1274A): Implications for lithium and boron budgets of oceanic lithosphere

Determining Elemental Composition Using Prompt γ Activation Analysis

Non-destructive analysis of metals and alloys using prompt gamma activation analysis and complementary methods

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