Готові списки джерел за темами / Zircon Helium

Добірка наукової літератури з теми "Zircon Helium"

Автор: Grafiati
Опубліковано: 10 грудня 2022
Оновлено: 28 січня 2023

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Статті в журналах з теми "Zircon Helium"

1

Nasdala, Lutz, Dieter Grambole, Jens Götze, Ulf Kempe, and Tamás Váczi. "Helium irradiation study on zircon." Contributions to Mineralogy and Petrology 161, no. 5 (August 5, 2010): 777–89. http://dx.doi.org/10.1007/s00410-010-0562-7.

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2

Yu, Shun, Wen Chen, Jingbo Sun, and Ze Shen. "Diffusion of helium in FCT zircon." Science China Earth Sciences 62, no. 4 (February 25, 2019): 719–32. http://dx.doi.org/10.1007/s11430-017-9283-3.

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3

Babsail, L., N. Hamelin, and P. D. Townsend. "Helium-ion implanted waveguides in zircon." Nuclear Instruments and Methods in Physics Research Section B: Beam Interactions with Materials and Atoms 59-60 (July 1991): 1219–22. http://dx.doi.org/10.1016/0168-583x(91)95797-h.

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4

Cherniak, D. J., E. B. Watson, and J. B. Thomas. "Diffusion of helium in zircon and apatite." Chemical Geology 268, no. 1-2 (October 2009): 155–66. http://dx.doi.org/10.1016/j.chemgeo.2009.08.011.

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5

Cherniak, D. J. "Diffusion of helium in radiation-damaged zircon." Chemical Geology 529 (December 2019): 119308. http://dx.doi.org/10.1016/j.chemgeo.2019.119308.

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6

Reich, Martin, Rodney C. Ewing, Todd A. Ehlers, and Udo Becker. "Low-temperature anisotropic diffusion of helium in zircon: Implications for zircon (U–Th)/He thermochronometry." Geochimica et Cosmochimica Acta 71, no. 12 (June 2007): 3119–30. http://dx.doi.org/10.1016/j.gca.2007.03.033.

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7

Kelly, Colter J., Daniel E. Harlov, David A. Schneider, Simon E. Jackson, and Renelle Dubosq. "Experimental fluid-mediated alteration of zircon under lower greenschist facies conditions." Canadian Mineralogist 58, no. 2 (March 1, 2020): 247–65. http://dx.doi.org/10.3749/canmin.1900041.

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ABSTRACT The use of zircon in the dating of geological processes and tectonic events has become a standard approach in many aspects of Earth science research. As a result, understanding how zircon interacts with aqueous fluids during metasomatism has become increasingly important. The alteration of natural zircon is driven primarily by coupled dissolution–reprecipitation or by ion-exchange with an aqueous fluid. In this study, whole and intact, euhedral light-brown zircon crystals (100–250 μm in length; 2 mg) from the Oligocene Fish Canyon Tuff (FCT) were experimentally reacted with an alkali-bearing reactive fluid and a REE + P source (0.5 mg CePO4 or 0.5 mg YPO4). Experiments were conducted in sealed Au metal capsules at 350 °C and 100 MPa for 182 days. During the experiment, the zircon became colorless, indicating annealing of the radiation damage in the crystal. Two-dimensional element maps of the outermost 3 μm of unpolished zircon crystal surfaces were produced using a grind of contiguous 7 μm analytical spots via laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The chemical maps indicate that the surface of the zircon crystals from each experiment heterogeneously reacted with the fluid, such that the Ce and Y concentration of chemically modified areas increased (by an order of magnitude) in the CePO4-bearing and YPO4-bearing experiments, respectively, when compared with the chemical maps of unaltered zircon grain surfaces. Helium ion microscopy of polished crystals revealed discontinuous micron-scale altered domains at the crystal margin, consistent with the findings of the unpolished mapping technique. Interestingly, the Th and U concentration of the altered zircon grain surfaces were consistent with the unaltered zircon regardless of the experiment. Incorporation of REEs on the zircon grain surface likely occurred via the coupled substitution REE3+ + P5+ ↔ Zr4+ + Si4+. The results from these experiments imply that the surfaces of minimally metamict zircon can be chemically modified by alkali-bearing fluids via ion exchange under lower greenschist pressures and temperatures over relatively short time periods with respect to the geological time scale.
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Guenthner, W. R., P. W. Reiners, R. A. Ketcham, L. Nasdala, and G. Giester. "Helium diffusion in natural zircon: Radiation damage, anisotropy, and the interpretation of zircon (U-Th)/He thermochronology." American Journal of Science 313, no. 3 (March 1, 2013): 145–98. http://dx.doi.org/10.2475/03.2013.01.

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9

Can, N., and P. D. Townsend. "Anomalous annealing of zircon optical waveguides formed by implantation of helium ions." Radiation Effects and Defects in Solids 128, no. 3 (April 1994): 215–20. http://dx.doi.org/10.1080/10420159408219760.

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Gautheron, Cécile, Rosella Pinna-Jamme, Alexis Derycke, Floriane Ahadi, Caroline Sanchez, Frédéric Haurine, Gael Monvoisin, et al. "Technical note: Analytical protocols and performance for apatite and zircon (U–Th) ∕ He analysis on quadrupole and magnetic sector mass spectrometer systems between 2007 and 2020." Geochronology 3, no. 1 (June 1, 2021): 351–70. http://dx.doi.org/10.5194/gchron-3-351-2021.

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Abstract. Apatite and zircon (U–Th) / He thermochronological data are obtained through a combination of crystal selection, He content measurement by crystal heating with analysis using noble gas mass spectrometry, and measurement of U, Th, and Sm contents by crystal dissolution as well as solution analysis using inductively coupled plasma mass spectrometry (ICP-MS). This contribution documents the methods for helium thermochronology used at the GEOPS laboratory, Paris-Saclay University, between 2007 and the present that allow apatite and zircon (U–Th) / He data to be obtained with precision. More specifically, we show that the He content can be determined with precision (at 5 %) and accuracy using a calibration of the He sensitivity based on the Durango apatite, and its use also appears crucial to check for He and U–Th–Sm analytical problems. The Durango apatite used as a standard is therefore a suitable mineral to perform precise He calibration and yields (U–Th) / He ages of 31.1 ± 1.4 Ma with an analytical error of less than 5 % (1σ). The (U–Th) / He ages for the Fish Canyon Tuff zircon standard yield a dispersion of about 9 % (1σ) with a mean age of 27.0 ± 2.6 Ma, which is comparable to other laboratories. For the long-term quality control of the (U–Th) / He data, attention is paid to evaluating the drift of He sensitivity and blanks through time as well as that of (U–Th) / He ages and Th / U ratios (with Sm / Th when possible), all relying on the use of Durango apatite and Fish Canyon Tuff zircon as standards.
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Дисертації з теми "Zircon Helium"

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"Radiation Damage and Helium Diffusion in Mineral Chronometers." Doctoral diss., 2019. http://hdl.handle.net/2286/R.I.54822.

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abstract: A mineral’s helium content reflects a balance between two competing processes: accumulation by radioactive decay and temperature-dependent diffusive loss. (U-Th)/He dating of zircon and other uranium and thorium-bearing minerals provides insight into the temperature histories of rocks at or near Earth’s surface that informs geoscientists’ understanding of tectonic and climate-driven exhumation, magmatic activity, and other thermal events. The crystal structure and chemistry of minerals affect helium diffusion kinetics, recorded closure temperatures, and interpretations of (U-Th)/He datasets. I used empirical and experimental methods to investigate helium systematics in two minerals chronometers: zircon and xenotime. The same radioactivity that makes zircon a valuable chronometer damages its crystal structure over time and changes zircon helium kinetics. I used a zircon, titanite, and apatite (U-Th)/He dataset combined with previously published data and a new thermal model to place empirical constraints on the closure temperature for helium in a suite of variably damaged zircon crystals from the McClure Mountain syenite of Colorado. Results of this study suggest that the widely-used zircon damage accumulation and annealing model (ZRDAAM) does not accurately predict helium closure temperatures for a majority of the dated zircons. Detailed Raman maps of Proterozoic zircon crystals from the Lyon Mountain Granite of New York document complex radiation damage zoning. Models based on these results suggest that most ancient zircons are likely to exhibit intracrystalline variations in helium diffusivity due to radiation damage zoning, which may, in part, explain discrepancies between my empirical findings and ZRDAAM. Zircon crystallography suggests that helium diffusion should be fastest along the crystallographic c-axis. I used laser depth profiling to show that diffusion is more strongly anisotropic than previously recognized. These findings imply that crystal morphology affects the closure temperature for helium in crystalline zircon. Diffusivity and the magnitude of diffusive anisotropy decrease with low doses of radiation damage. Xenotime would make a promising (U-Th)/He thermochronometer if its helium kinetics were better known. I performed classic step-wise degassing experiments to characterize helium diffusion in xenotime FPX-1. Results suggest that this xenotime sample is sensitive to exceptionally low temperatures (∼50 °C) and produces consistent (U-Th)/He dates.
Dissertation/Thesis
Doctoral Dissertation Geological Sciences 2019
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2

Trenouth, C. W. "An insight into the low­temperature thermal evolution of the covered eastern Gawler Craton margin: the Stuart Shelf basement." Thesis, 2015. http://hdl.handle.net/2440/118240.

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This item is only available electronically.
Multi-method thermochronology applied to the eastern Gawler Craton, beneath the Stuart Shelf cover (Olympic Dam Domain, South Australia), reveals multiple episodes of exhumation. Modelled data from Apatite Fission Track (AFT) analysis identifies four time periods where the eastern Gawler Craton basement experienced cooling into AFT closure temperatures (~60-120°C); at1050 ± 55 Ma (Mesoproterozoic), 439 ± 14 Ma (late Ordovician-Silurian), 304 ±36 Ma (mid-Carboniferous-mid Permian) and 245 ± 52 Ma (late Permian-early Jurassic). In addition, the Carboniferous and Jurassic peaks are supported by zircon (ZHe) and apatite (AHe) (U-Th-Sm)/ He results. The Ordovician peak is interpreted as resulting from the final pulses of the Delamerian Orogeny partially, mixed with the first pulses of the Alice Springs Orogeny. The Carboniferous-Permian event is linked with widespread exhumation likely due to the final pulses of the Alice Springs Orogeny (~300Ma). The preserved Mesoproterozoic event presents new AFT data in the area and coincides with some recent studies. However, it occurs only in samples obtained from the Gawler Range Volcanics and more prominent in core depth shallower than 500m. The late Permian-early Jurassic event is comparable to events believed have to stemmed from hydrothermal events. This event compliments AFT studies in the northern Flinders Ranges. The Late Ordovician-Silurian and Carboniferous-early Permian AFT pulses confirm events seen in studies of surrounding regions. Other geochronological studies around the Olympic Dam area indicate that this pulse either results from a localised hydrothermal event or distal effects of the Musgravian Orogeny. The Jurassic event suggests that the hydrothermal effect on AFT ages may be a more widespread event and not just localised to the northern Flinders Ranges as previously thought. The Ordovician event represents mixing between Delamerian and Alice Springs Orogenies. The Carboniferous-Permian event represents late distal effects of the Alice Springs Orogeny. These events match those of surrounding regions.
Thesis (B.Sc.(Hons)) -- University of Adelaide, School of Physical Sciences, 2015
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Книги з теми "Zircon Helium"

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Damen, Patricia Maria Gerardina. Helium and fission gas behaviour in magnesium aluminate spinel and zirconia for actinide transmutation. Delft, The Netherlands: DUP Science, 2003.

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2

Damen, Patricia. Helium & Fission Gas Behavior in Magnesium Aluminate Spinel & Zirconia for Actinide Transmutation. Delft Univ Pr, 2003.

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Тези доповідей конференцій з теми "Zircon Helium"

1

Goldsmith, Adam S., Daniel F. Stockli, and Richard A. Ketcham. "MECHANISMS OF HELIUM DIFFUSION FROM ZIRCON, AND THE TRANSITION TO THE METAMICT STATE." In GSA Annual Meeting in Denver, Colorado, USA - 2016. Geological Society of America, 2016. http://dx.doi.org/10.1130/abs/2016am-287825.

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2

Ross, Catherine, Daniel F. Stockli, Timmons Erickson, Desmond B. Patterson, and Sean P. S. Gulick. "ZIRCON (U-TH)/HE IMPACT CRATER THERMOCHRONOMETRY AND THE EFFECTS OF SHOCK MICROSTRUCTURES ON HELIUM DIFFUSION KINETICS." In GSA 2020 Connects Online. Geological Society of America, 2020. http://dx.doi.org/10.1130/abs/2020am-357530.

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3

Rohan, P., P. Chraska, P. Ctibor, and K. Neufuss. "Relation Between Thermal Expansion Coefficient and Porosity in Thick Zircon and Alumina Coatings." In ITSC 2000, edited by Christopher C. Berndt. ASM International, 2000. http://dx.doi.org/10.31399/asm.cp.itsc2000p1067.

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Abstract For utilization of free-standing ceramic parts produced by plasma spraying it is very important to know the temperature dependence of the linear thermal expansion coefficient and its relation to the porosity of the structure. Zircon ZrSiO4 and gray alumina (96 wt % AI2O3) were plasma sprayed by the water stabilized plasma gun WSP PAL 160. Samples of both materials were cut from thick coatings with respect to their orientation to the gun axis during the gun's horizontal spraying cycling with a constant speed. Thermal expansion coefficients and the differential thermal analysis were performed using SETARAM complex measuring system (up to 1750 °C), the density/porosity was measured by several techniques, such as Archimedean weighing, helium pycnometry, etc. It was found that both, the porosity and the thermal expansion coefficient, change for different locations in the thick deposit due to the varying trajectories of individual particles/droplets in the plasma stream. Measured data for deposits are then compared with data for bulk ceramics. The dependence of the thermal expansion coefficient on porosity in a given location was determined and its general applicability for free-standing plasma spraying is then discussed in the paper.
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4

Chen, D., J. Colmenares-Angulo, R. Molz, C. Dambra, and D. Hawley. "Helium-Free Parameter Development for TriplexPro-210 Plasma Gun." In ITSC2011, edited by B. R. Marple, A. Agarwal, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and A. McDonald. DVS Media GmbH, 2011. http://dx.doi.org/10.31399/asm.cp.itsc2011p0627.

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Abstract This paper focuses on the use of hydrogen and nitrogen as secondary gases for atmospheric plasma spray using the TriplexPro-210 gun platform. The paper includes process mapping of particle state in addition to measurements of actual stress states within the coating during coating application. The feedstock powders used for this investigation include yttria stabilized zirconia, chromium oxide, nickel chromium aluminum and nickel aluminum. In addition, the paper discusses differences in application costs.
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Zhang, C., C. J. Li, C. X. Li, W. Gao, M. Planche, H. Liao, and C. Coddet. "Effect of In-Flight Particle Velocity on the Performance of APS YSZ Electrolyte." In ITSC2007, edited by B. R. Marple, M. M. Hyland, Y. C. Lau, C. J. Li, R. S. Lima, and G. Montavon. ASM International, 2007. http://dx.doi.org/10.31399/asm.cp.itsc2007p0711.

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Abstract In this paper, the effect of velocity on the characteristics of atmospheric plasma sprayed yttria stabilized zirconia was investigated through adjusting auxiliary helium flow. The temperature and velocity of in-flight particles were measured with DPV2000 analyzer. The results showed that helium flow significantly influenced particle velocity and less distinctly influenced particle temperature. The microstructure of the coatings was characterized by scanning electron microscopy and X-ray diffraction analyzer. The ionic conductivity of the deposits through thickness direction was measured by a potentiostat/galvanostat based on three-electrode assembly approach in a temperature range of 500-1000 °C. The specific gas permeability was estimated. The results showed that the gas permeability was improved by increasing the in-flight particle velocity. However, the in-flight particle velocity has little effect on the ionic conductivity of specimens.
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Martinez, Oscar, and Christopher Blessinger. "ORNL Special Form Testing of Sealed-Source Encapsulations." In ASME 2015 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/pvp2015-46003.

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In the United States of America all transportation of radioactive material is regulated by the Department of Transportation (DOT), along with input from the Nuclear Regulatory Commission. Beginning in 2008 a new type of sealed-source encapsulation package was developed at Oak Ridge National Laboratory (ORNL); these packages contain radioactive material and are regulated and transported in accordance with the requirements set for DOT Class 7 hazardous material. DOT provides regulations pertaining to specific package contents categorized as special form designs. The special form designation indicates that the encapsulated radioactive contents have a very low probability of dispersion even when subjected to significant structural conditions. All ORNL DOT designs have been certified by DOT as being special form materials. The special form designs have been shown to simplify the delivery, transport, acceptance, and receipt process. Simplification of the transportation process makes the sealed-source encapsulation designs very advantageous for shipment to various facilities throughout the lifetime of the special form material. To this end, DOT Certificates of Competent Authority (CoCAs) have been sought for the design suitable for containing high-alpha-activity actinide materials. This design consists of a core of porous zirconia matrix pre-encapsulated within triangular canister (ZipCan) tiles that are then enclosed by a spherical shell. This new ZipCan design and a similar rectangular ZipCube design were tested for compliance with the regulations found in Title 49, Code of Federal Regulations, Section 173.469, Tests for Special Form Class 7 (Radioactive) (49 CFR 173.469) materials. The spherical enclosure was subjected to 9 m impact, 1 m percussion, and 10-minute thermal tests. Before and after each test the designs were subjected to a helium leak check and a bubble test. The ZipCan tiles and core were subjected to the tests required for ISO 2919:1999(E), including a Class 4 impact test and heat test, and were subsequently subjected to helium leakage rate tests [49 CFR 173.469(a)(4)(i)]. The impact tile test unit contained a nonradioactive surrogate; however, the thermal test unit contained a radioactive source. All three designs are still undergoing regulatory special form testing, and all three sealed-source encapsulation designs are to be submitted to DOT for CoCAs.
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