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  • 1
    Call number: AWI G5-15-0050
    In: Developments in paleoenvironmental research
    Description / Table of Contents: Contents: 1 Micro-XRF Studies of Sediment Cores: A Perspective on Capability and Application in the Environmental Sciences / R. Guy Rothwell and Ian W. Croudace. - PART 1 MARINE STUDIES. - 2 Twenty Years of XRF Core Scanning Marine Sediments: What Do Geochemical Proxies Tell Us? / R. Guy Rothwell and Ian W. Croudace. - 3 Optimization of Itrax Core Scanner Measurement Conditions for Sediments from Submarine Mud Volcanoes / Isabel Rodríguez-Germade, Belén Rubio, Daniel Rey, Federico Vilas, Carmen F. López-Rodríguez, Maria Carmen Comasand Francisca Martínez-Ruiz. - 4 Use of Calibrated ITRAX XRF Data in DeterminingTurbidite Geochemistry and Provenance in Agadir Basin, Northwest African Passive Margin / James E. Hunt, Ian W. Croudace and Suzanne E. MacLachlan. - 5 Identification, Correlation and Origin of Multistage Landslide Events in Volcaniclastic Turbidites in the Moroccan Turbidite System / James E. Hunt, Russell B. Wynn and Ian W. Croudace. - 6 An Empirical Assessment of Variable Water Content and Grain-Size on X-Ray Fluorescence Core-Scanning Measurements of Deep Sea Sediments / Suzanne E. MacLachlan, James E. Hunt and Ian W. Croudace. - PART 2 LAKE AND RIVER STUDIES. - 7 Micro-XRF Core Scanning in Palaeolimnology: Recent Developments / Sarah J. Davies, Henry F. Lamb and Stephen J. Roberts. - 8 Micro-XRF Applications in Fluvial Sedimentary Environments of Britain and Ireland: Progress and Prospects / Jonathan N. Turner, Anna F. Jones, Paul A. Brewer, Mark G. Macklin and Sara M. Rassner. - 9 Estimation of Biogenic Silica Concentrations Using Scanning XRF: Insights from Studies of Lake Malawi Sediments / Erik T. Brown. - 10 Optimization of Itrax Core Scanner Protocols for the Micro X-Ray Fluorescence Analysis of Finely Laminated Sediment: A Case Study of Lacustrine Varved Sediment from the High Arctic / Stéphanie Cuven, Pierre Francus, Jean François Crémerand Francis Bérubé. - 11 Investigating the Use of Scanning X-Ray Fluorescence to Locate Cryptotephra in Minerogenic Lacustrine Sediment: Experimental Results / Nicholas L. Balascio, Pierre Francus, Raymond S. Bradley, Benjamin B. Schupack, Gifford H. Miller, Bjørn C. Kvisvik, Jostein Bakke and Thorvaldur Thordarson. - 12 Combined [My]-XRF and Microfacies Techniques for Lake Sediment Analyses / Peter Dulski, Achim Brauer and Clara Mangili. - 13 Experiences with XRF-Scanning of Long Sediment Records / Christian Ohlendorf, Volker Wennrich and Dirk Enters. - 14 Approaches to Water Content Correction and Calibration for [My]XRF Core Scanning: Comparing X-ray Scattering with Simple Regression of Elemental Concentrations / John F. Boyle, Richard C. Chiverrell and Dan Schillereff. - PART 3 ENVIRONMENTAL GEOCHEMISTRY AND FORENSIC APPLICATIONS. - 15 X-Ray Core Scanners as an Environmental Forensics Tool: A Case Study of Polluted Harbour Sediment (Augusta Bay, Sicily) / Ian W. Croudace, Elena Romano, Antonella Ausili, Luisa Bergamin and R. Guy Rothwell. - 16 Modern Pollution Signals in Sediments from Windermere, NW England, Determined by Micro-XRF and Lead Isotope Analysis / Helen Miller, Ian W. Croudace, Jonathan M. Bull, Carol J. Cotterill, Justin K. Dix and Rex N. Taylor. - 17 ITRAX Core Scanner Capabilities Combined with Other Geochemical and Radiochemical Techniques to Evaluate Environmental Changes in a Local Catchment, South Sydney, NSW, Australia / P. Gadd, H. Heijnis, C. Chagué-Goff, A. Zawadzki, D. Fierro, P. Atahan, Ian W. Croudace and J. Goralewski. - PART 4 TECHNOLOGICAL ASPECTS. - 18 A Geochemical Approach to Improve Radiocarbon-Based Age-Depth Models in Non-laminated Sediment Series / Fabien Arnaud and Sidonie Révillon. - 19 Limited Influence of Sediment Grain Size on Elemental XRFCore Scanner Measurements / Sébastien Bertrand, Konrad Hughen and Liviu Giosan. - 20 Standardization and Calibration of X-Radiographs Acquired with the ITRAX Core Scanner / Pierre Francus, Kinuyo Kanamaru and David Fortin. - 21 Prediction of Geochemical Composition from XRF Core Scanner Data: A New Multivariate Approach Including Automatic Selection of Calibration Samples and Quantification of Uncertainties / G. J. Weltje, M. R. Bloemsma, R. Tjallingii, D. Heslop, U. Röhl and Ian W. Croudace. - 22 Parameter Optimisation for the ITRAX Core Scanner / Stuart Jarvis, Ian W. Croudace and R. Guy Rothwell. - 23 UV-Spectral Luminescence Scanning: Technical Updates and Calibration Developments / Craig A. Grove, Alberto Rodriguez-Ramirez, Gila Merschel, Rik Tjallingii, Jens Zinke, Adriano Macia and Geert-Jan A. Brummer. - 24 An Inter-comparison of [My]XRF Scanning Analytical Methods for Lake Sediments / Daniel N. Schillereff, Richard C. Chiverrell, Ian W. Croudace and John F. Boyle. - 25 Analysis of Coal Cores Using Micro-XRF Scanning Techniques / Sarah J. Kelloway, Colin R. Ward, Christopher E. Marjo, Irene E. Wainwright and David R. Cohen. - 26 ItraxPlot: An Intuitive Flexible Program for Rapidly Visualising Itrax Data / Ian W. Croudace and R. Guy Rothwell. - PART 5 THE FUTURE OF NON-DESTRUCTIVE CORE SCANNING. - 27 Future Developments and Innovations in High-ResolutionCore Scanning / Ian W. Croudace and R. Guy Rothwell. - Index.
    Description / Table of Contents: This volume presents papers on the use of micro-XRF core scanners in palaeoenvironmental research. It contains a broad ranging view of instrument capability and points to future developments that will help contribute to higher precision elemental data and faster core analysis. Readers will find a diverse range of research by leading experts that have used micro-XRF core scanners in a wide range of scientific applications. The book includes specific application papers reporting on the use of XRF core scanners in a variety of marine, lacustrine, and pollution studies. In addition, coverage also examines practical aspects of core scanner usage, data optimisation, and data calibration and interpretation. In a little over a decade, micro-XRF sediment core scanners have made a substantive contribution to palaeoenvironmental research. Their impact is based on their ability to rapidly, non-destructively, and automatically scan sediment cores. Not only do they rapidly provide important proxy data without damaging samples, but they can obtain environmental data at decadal, annual, and even sub-annual scales. This volume will help both experienced and new users of these non-destructive core scanners take full advantage of one of the most powerful geochemical screening tools in the environmental scientist's toolbox
    Type of Medium: Monograph available for loan
    Pages: XXIX, 656 S. : Ill., graph. Darst., Kt.
    ISBN: 9789401798488
    Series Statement: Developments in paleoenvironmental research 17
    Branch Library: AWI Library
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  • 2
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Environmental science & technology 29 (1995), S. 1288-1296 
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 3
    Electronic Resource
    Electronic Resource
    s.l. : American Chemical Society
    Environmental science & technology 29 (1995), S. 1288-1296 
    ISSN: 1520-5851
    Source: ACS Legacy Archives
    Topics: Chemistry and Pharmacology , Energy, Environment Protection, Nuclear Power Engineering
    Type of Medium: Electronic Resource
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  • 4
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 6 (1982), S. 0 
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The concentrations of 26 elements have been investigated in seven BCS certified reference samples using three varieties of neutron activation analysis. The ANRT granite GS-N was used as the comparator reference material while the USGS basalt BHVO-1 and the GIT-IWG basalt BE-N were analysed concurrently to assess the analytical accuracy.
    Type of Medium: Electronic Resource
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  • 5
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 5 (1981), S. 0 
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Instrumental and radiochemical neutron activation analysis, using chromatographic group separations prior to neutron irradiation, were used to determine eight rare earths and twelve other trace elements in the two British Chemical Standards feldspars BCS 375 (Soda) and BCS 376 (Potash).
    Type of Medium: Electronic Resource
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  • 6
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 17 (1993), S. 0 
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The fluorine content in twenty-nine reference samples of geological interest has been determined using a well tried and tested method which has been previously reported. The analytical method uses fast neutron activation involving the reaction 19F(n,a)16N and gamma spectrometry. Interferences have been found to be negligible for the experimental conditions used. The method involves minimal sample preparation, is rapid and can easily measure concentrations down to 5 parts per million in a 5 g sample.
    Type of Medium: Electronic Resource
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  • 7
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: Rare earth data for nine well-known geochemical reference samples were obtained using a rapid and efficient cation exchange chromatographic separation procedure. It involves the use of a mixed-acid eluent (HCI and HNO3) on a 15 x 1 cm column of Bio-Rad AG50–X8 (200–400 mesh) to remove matrix and many trace elements from rock solutions. The rare earth elements are removed from the column using 60 ml 7M HNO3. The pre-concentration procedure described is routinely used in this laboratory for the determination of the rare earth elements by mass spectrometry-isotope dilution, and has been satisfactorily used for their determination using inductively-coupled plasma-source atomic emission spectrometry.
    Type of Medium: Electronic Resource
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  • 8
    Electronic Resource
    Electronic Resource
    Oxford, UK : Blackwell Publishing Ltd
    Geostandards and geoanalytical research 13 (1989), S. 0 
    ISSN: 1751-908X
    Source: Blackwell Publishing Journal Backfiles 1879-2005
    Topics: Geosciences
    Notes: The fluorine concentration in seventy-one reference samples of geological interest has been determined using fast-neutron activation analysis. The reaction involved [19F(n, α) 16N] uses accelerator-derived neutrons produced by bombarding a Be target with 3 MeV deuterons. The gamma radiation associated with the decay of 16N (t1/2 = 7.13 s) is counted and for the irradiation conditions used there are no serious interferences. The advantages of this technique over other schemes of fluorine determination are its simple procedure for sample preparation, speed, high sensitivity and non-destructiveness. A comparison of the data obtained with those in the literature is highly favourable.
    Type of Medium: Electronic Resource
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  • 9
    ISSN: 1432-0819
    Keywords: Key words Lava domes ; Recharge ; Eruption mechanisms ; Encapsulation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Geosciences
    Notes: Abstract  The Cerro Chascon-Runtu Jarita Complex is a group of ten Late Pleistocene (∼85 ka) lava domes located in the Andean Central Volcanic Zone of Bolivia. These domes display considerable macroscopic and microscopic evidence of magma mixing. Two groups of domes are defined chemically and geographically. A northern group, the Chascon, consists of four lava bodies of dominantly rhyodacite composition. These bodies contain 43–48% phenocrysts of plagioclase, quartz, sanidine, biotite, and amphibole in a microlite-poor, rhyolitic glass. Rare mafic enclaves and selvages are present. Mineral equilibria yield temperatures from 640 to 750  °C and log ƒO2 of –16. Geochemical data indicate that the pre-eruption magma chamber was zoned from a dominant volume of 68% to minor amounts of 76% SiO2. This zonation is best explained by fractional crystallization and some mixing between rhyodacite and more evolved compositions. The mafic enclaves represent magma that intruded but did not chemically interact much with the evolved magmas. A southern group, the Runtu Jarita, is a linear chain of six small domes (〈1 km3 total volume) that probably is the surface expression of a dike. The five most northerly domes are composites of dacitic and rhyolitic compositions. The southernmost dome is dominantly rhyolite with rare mafic enclaves. The composite domes have lower flanks of porphyritic dacite with ∼35 vol.% phenocrysts of plagioclase, orthopyroxene, and hornblende in a microlite-rich, rhyodacitic glass. Sieve-textured plagioclase, mixed populations of disequilibrium plagioclase compositions, xenocrystic quartz, and sanidine with ternary composition reaction rims indicate that the dacite is a hybrid. The central cores of the composite domes are rhyolitic and contain up to 48 vol.% phenocrysts of plagioclase, quartz, sanidine, biotite, and amphibole. This is separated from the dacitic flanks by a banded zone of mingled lava. Macroscopic, microscopic, and petrologic evidence suggest scavenging of phenocrysts from the silicic lava. Mineral equilibria yield temperatures of 625–727  °C and log ƒO2 of –16 for the rhyolite and 926–1000  °C and log ƒO2 of –9.5 for the dacite. The rhyolite is zoned from 73 to 76% SiO2, and fractionation within the rhyolite composition produced this variation. Most of the 63–73% SiO2 compositional range of the lava in this group is the result of mixing between the hybrid dacite and the rhyolite. Eruption of both groups of lavas apparently was triggered by mafic recharge. A paucity of explosive activity suggests that volatile and thermal exchanges between reservoir and recharge magmas were less important than volume increase and the lubricating effects of recharge by mafic magmas. For the Runtu Jarita group, the eruption is best explained by intrusion of a dike of dacite into a chamber of crystal-rich rhyolite close to its solidus. The rhyolite was encapsulated and transported to the surface by the less-viscous dacite magma, which also acted as a lubricant. Simultaneous effusion of the lavas produced the composite domes, and their zonation reflects the subsurface zonation. The role of recharge by hotter, more fluid mafic magma appears to be critical to the eruption of some highly viscous silicic magmas.
    Type of Medium: Electronic Resource
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  • 10
    Electronic Resource
    Electronic Resource
    New York, NY [u.a.] : Wiley-Blackwell
    X-Ray Spectrometry 19 (1990), S. 117-123 
    ISSN: 0049-8246
    Keywords: Chemistry ; Analytical Chemistry and Spectroscopy
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Physics
    Notes: The reliable, routine XRF determination of trace elements in iron-rich geological samples, such as banded iron formations, oolitic ironstones and ferromanganese nodules, has until recently been limited. The scattered radiation method (using Compton scattering), well established in normal silicate rock analysis, was developed for the determination of trace element concentrations in diverse rock compositions. Single calibration lines are used for each trace element and serve to provide data over broad sample compositions, ranging from 0 to 70% Fe2O3. A critical evaluation of the calibration lines obtained and the results of trace analyses of synthetic mixtures showed the method to be readily capable of providing accurate chemical data.
    Additional Material: 3 Ill.
    Type of Medium: Electronic Resource
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