Skip to main content
U.S. Department of Energy
Office of Scientific and Technical Information

Micro- and Nanoscale Surface Analysis of Late Iron Age Glass from Broborg, a Vitrified Swedish Hillfort

Journal Article · · Microscopy and Microanalysis

Abstract

Archaeological glasses with prolonged exposure to biogeochemical processes in the environment can be used to understand glass alteration, which is important for the safe disposal of vitrified nuclear waste. Samples of mafic and felsic glasses with different chemistries, formed from melting amphibolitic and granitoid rocks, were obtained from Broborg, a Swedish Iron Age hillfort. Glasses were excavated from the top of the hillfort wall and from the wall interior. A detailed microscopic, spectroscopic, and diffraction study of surficial textures and chemistries were conducted on these glasses. Felsic glass chemistry was uniform, with a smooth surface showing limited chemical alteration (<150 nm), irrespective of the position in the wall. Mafic glass was heterogeneous, with pyroxene, spinel, feldspar, and quartz crystals in the glassy matrix. Mafic glass surfaces in contact with topsoil were rougher than those within the wall and had carbon-rich material consistent with microbial colonization. Limited evidence for chemical or physical alteration of mafic glass was found; the thin melt film that coated all exposed surfaces remained intact, despite exposure to hydraulically unsaturated conditions, topsoil, and associated microbiome for over 1,500 years. This supports the assumption that aluminosilicate nuclear waste glasses will have a high chemical durability in near-surface disposal facilities.

Sponsoring Organization:
USDOE
OSTI ID:
1908915
Alternate ID(s):
OSTI ID: 1923783
Journal Information:
Microscopy and Microanalysis, Journal Name: Microscopy and Microanalysis Journal Issue: 1 Vol. 29; ISSN 1431-9276
Publisher:
Oxford University PressCopyright Statement
Country of Publication:
United States
Language:
English

References (47)

An investigation of hydrogen depth profiling using ToF-SIMS: Hydrogen depth profiling using ToF-SIMS journal September 2011
Nanoscale imaging of hydrogen and sodium in alteration layers of corroded glass using ToF-SIMS: Is an auxiliary sputtering ion beam necessary? journal October 2018
Preliminary Scanning Electron Microscopy Study of Microbiologically Induced Deterioration of High Alkali Low-Lime Glass book January 1987
Experimental palagonitization of basaltic glasses of varied composition journal January 1975
Natural analogues: studies of geological processes relevant to radioactive waste disposal in deep geological repositories journal April 2015
Palagonite – a review journal August 2002
A textural and chemical study of Icelandic palagonite of varied composition and its bearing on the mechanism of the glass-palagonite transformation journal March 1991
Interdiffusion of hydrogen and alkali ions in a glass surface journal December 1975
Archaeological glasses as modelling of the behavior of buried nuclear waste glass journal July 1992
Wood ash composition as a function of furnace temperature journal January 1993
Near-field performance assessment for a low-activity waste glass disposal system: laboratory testing to modeling results journal September 2001
The effect of time on the weathering of silicate minerals: why do weathering rates differ in the laboratory and field? journal December 2003
Effect of iron metal and siderite on the durability of simulated archeological glassy material journal November 2013
A fractured roman glass block altered for 1800 years in seawater: Analogy with nuclear waste glass in a deep geological repository journal November 2008
Experimental determination of the effect of the ratio of B/Al on glass dissolution along the nepheline (NaAlSiO4)–malinkoite (NaBSiO4) join journal May 2010
Long-term modeling of alteration-transport coupling: Application to a fractured Roman glass journal April 2010
The dissolution behavior of borosilicate glasses in far-from equilibrium conditions journal April 2018
All about wood ash: Long term fire experiments reveal unknown aspects of the formation and preservation of ash with critical implications on the emergence and use of fire in the past journal November 2021
Effect of marine aerosols on the alteration of silicate glasses journal September 2017
Corrosion of alkali–borosilicate waste glass K-26 in non-saturated conditions journal April 2005
The ion exchange phase in corrosion of nuclear waste glasses journal November 2006
SON68 nuclear glass dissolution kinetics: Current state of knowledge and basis of the new GRAAL model journal October 2008
Archaeological analogs and the future of nuclear waste glass journal November 2010
Non-linear effects of alumina concentration on Product Consistency Test response of waste glasses journal December 2018
Adaptation of the GRAAL model of Glass Reactivity to accommodate non-linear diffusivity journal December 2018
History of Nuclear Waste Glass in France journal January 2014
Ion-Exchange Interdiffusion Model with Potential Application to Long-Term Nuclear Waste Glass Performance journal April 2016
Modeling glass corrosion with GRAAL journal November 2018
Microbial interactions with silicate glasses journal March 2021
Applying laboratory methods for durability assessment of vitrified material to archaeological samples journal November 2021
Reproduction of melting behavior for vitrified hillforts based on amphibolite, granite, and basalt lithologies journal January 2021
Niche Partitioning of Microbial Communities at an Ancient Vitrified Hillfort: Implications for Vitrified Radioactive Waste Disposal journal August 2020
Geology of the vitrified hill-fort Broborg in Uppland, Sweden journal March 1993
Short- and Long-Term Olivine Weathering in Svalbard: Implications for Mars journal December 2008
A Chemical Classification of Volcanic Rocks Based on the Total Alkali-Silica Diagram journal June 1986
Structure of potassium sulfate at temperatures from 296 K down to 15 K journal June 1995
Current Understanding and Remaining Challenges in Modeling Long-Term Degradation of Borosilicate Nuclear Waste Glasses journal November 2013
Pre-Viking Swedish hillfort glass: A prospective long-term alteration analogue for vitrified nuclear waste journal April 2018
Alteration textures in terrestrial volcanic glass and the associated bacterial community journal January 2009
Geologic Disposal of High-Level Radioactive Waste: Status, Key Issues, and Trends journal November 2012
Major to trace element imaging and analysis of iron age glasses using stage scanning in the analytical dual beam microscope (tandem) journal June 2022
Alteration of Basaltic Glass in Iceland as a Natural Analogue for Nuclear Waste Glasses: Geochemical Modelling with DISSOL journal January 1988
The Role of Boron in Monitoring the Leaching of Borosilicate Glass Waste Forms journal January 1984
Natural Analogs and Performance Assessment for Geologic Disposal of Nuclear Waste journal January 1999
Natural Analogues: Their Application to the Prediction of the Long-Term Behavior of Nuclear Waste Forms journal January 1986
Nuclear Waste Glasses - How Durable? journal December 2006
Vitrified hillforts as anthropogenic analogues for nuclear waste glasses – project planning and initiation journal January 2016

Similar Records

Reproduction of melting behavior for vitrified hillforts based on amphibolite, granite, and basalt lithologies
Journal Article · Wed Jan 13 23:00:00 EST 2021 · Scientific Reports · OSTI ID:1759149

Pre‐Viking Swedish hillfort glass: A prospective long‐term alteration analogue for vitrified nuclear waste
Journal Article · Sat Apr 14 00:00:00 EDT 2018 · International Journal of Applied Glass Science · OSTI ID:1433263

Related Subjects