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"Clark, Ian D"
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The Preparation of Water (DIC, DOC) and Gas (CO2, CH4) Samples for Radiocarbon Analysis at AEL-AMS, Ottawa, Canada
Sample preparation techniques for radiocarbon analysis of dissolved inorganic carbon (DIC) and dissolved organic carbon (DOC) in freshwater, as well as CO2 and CH4 in gas mixtures are presented. Focused efforts have been on developing a robust and low-background wet oxidation extraction method for DOC in freshwater, following routine methods developed for stable carbon isotope analysis and adapted for radiocarbon (14C) analysis. DIC (by acidification) and DOC (by wet oxidation) are converted to CO2 in pre-baked septum-fitted borosilicate bottles, where the resulting CO2 is extracted from the dissolved and headspace portions on a low-flow He-carrier flow-through system interfaced to a vacuum extraction line. A peripheral CH4 extraction line interfaces to the flow line to separate CH4 from environmental samples following the methods of Pack et al. 2015. High sample throughput and low blanks are achievable with this method. DIC and DOC blanks are consistently <0.7 pMC, while CO2 and CH4 blanks are typically <0.1 pMC.
Journal Article
An historical geography of tourism in Victoria, Australia : case studies
Annotation This work is concerned with the emergence of tourism in colonial Victoria, Australia, and is part of ongoing research into understanding the 'tourism era of discovery'. It deals with the processes of opening up new attractions and its focus is the embryonic or emergent phase in which natural attractions become the subject of tourist visitation. It is contextualized in the study of eight tourism sites that are the primary focus of this work.
Book
Bunyip, Bunjil and mother-in-law avoidance: New insights into the interpretation of Bunjils Shelter, Victoria, Australia
Bunjils Shelter in the Black Range near Stawell, Victoria, Australia, is generally regarded as one of the most significant rock art sites in Victoria. However, its provenance has been marked by nagging doubts about its authenticity, and for a short period of time it was delisted from the site register of the Victoria Archaeological Survey. A 1925 newspaper article by Rev. John Mathew based on information he obtained from a Wimmera Aboriginal woman at Lake Tyers Aboriginal station in 1924 has the potential to augment the interpretive significance of the site. We now know that the site is commemorative of a major clash between Bunjil and Bunyip and is interwoven with the principle of mother-in-law avoidance. This paper briefly revisits the history of the provenance of the site before discussing the 'new' interpretation.
Journal Article
Late Pleistocene and Holocene ice-wedge activity on the Blackstone Plateau, central Yukon, Canada
Ice-wedge activity can be used to reconstruct past environmental conditions. We investigated the moisture source and timing of ice-wedge formation on the Blackstone Plateau. A section of permafrost exposed ice wedges that developed at two distinct depths: the first set formed syngenetically and penetrated alluvial silts from the top of permafrost; the second set, truncated by an erosional or thaw contact, was found solely in icy muddy gravels (>3.1 m depth). The δ18O and D-excess records of the ice wedges suggest that they formed from freezing of snow meltwater whose isotopic composition evolved during meltout. The 14CDOC results suggest that climate was favorable to ice-wedge growth between 32,000–30,000 and 14,000–12,500 cal yr BP, but there was likely a hiatus during the last glacial maximum due to climate being too dry. During the early to mid-Holocene, ice wedges were inactive as a result of warmer and wetter climate. Ice wedge re-initiated around 6360 cal yr BP, with a peak in activity between 3980 and 920 cal yr BP, a period characterized by cool and moist climate. Overall, timing of ice-wedge activity was broadly consistent with the climate and vegetation evolution in the western Arctic.
Journal Article
Together forever
\"A new team of Titans is forged when old friends must reunite to uncover a new mystery that threatens the lives of all Titans past and present! Since the debut of Robin, young heroes across the globe have banded together under the banner of the Teen Titans! But what happens when the Titans are teens no more? Anyone who has ever been a Titan is being hunted down and killed. Can the one-time Titans team of Nightwing, Beast Boy, Raven, Cyborg, Starfire, Red Arrow and Donna Troy survive long enough to discover the identity of their mysterious foe?\"-- Provided by publisher.
Book
First Status Report on Radiocarbon Sample Preparation Techniques at the A.E. Lalonde AMS Laboratory (Ottawa, Canada)
The A.E. Lalonde accelerator mass spectrometer (3MV, HVEE) was commissioned in early 2014 at the University of Ottawa (Canada). The radiocarbon sample preparation laboratory spent the better part of 2014 undertaking a quality control program, establishing pretreatment protocols, and streamlining sample processing. In the fall of 2014, the first unknown samples were accepted and in the first year of operation well over 1000 targets (~60% unknowns) were analyzed. Here, we present an overview of sample processing protocols and results from routinely measured standards, reference, and blank materials.
Journal Article
Superman : President Luthor
His fame bolstered after helping to rebuild Gotham City after an earthquake, billionaire Lex Luthor decides to run for the highest office in the land, the American presidency.
Book
Aquitard Fluids and Gases
S. C. Priestley et al. use traditional conservative tracers, Cl− and 4He, to constrain vertical transport through the aquitard underlying the Great Artesian Basin in central Australia, showing how these porewater profiles record paleohydrological conditions and impacts of past climates on recharge. Ian D. Clark M. Jim Hendry Jean-Michel Matray Douglas Kip Solomon H. Niklaus Waber [1] M. J. Hendry, L. I. Wassenaar, \"Implications of the distribution of δ D in pore waters for groundwater flow and the timing of geologic events in a thick aquitard system,\" Water Resources Research, vol. 35 no. 6, pp. 1751-1760, DOI: 10.1029/1999WR900046, 1999. [5] F. Bensenouci, J. L. Michelot, J. M. Matray, S. Savoye, M. Massault, A. Vinsot, \"Coupled study of water-stable isotopes and anions in porewater for characterizing aqueous transport through the Mesozoic sedimentary series in the eastern Paris Basin,\" Marine and Petroleum Geology, vol. 53, pp. 88-101, DOI: 10.1016/j.marpetgeo.2013.12.012, 2014.
Journal Article