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Atlantic Geoscience Society: Abstracts - 2008 Colloquium & Annual General Meeting, Dartmouth, Nova Scotia Document generated on 10/01/2021 6:41 p.m. Atlantic Geology Atlantic Geoscience Society: Abstracts - 2008 Colloquium & Annual General Meeting, Dartmouth, Nova Scotia Volume 44, 2008 URI: https://id.erudit.org/iderudit/ageo44abs01 See table of contents Publisher(s) Atlantic Geoscience Society ISSN 0843-5561 (print) 1718-7885 (digital) Explore this journal Cite this document (2008). Atlantic Geoscience Society: Abstracts - 2008 Colloquium & Annual General Meeting, Dartmouth, Nova Scotia. Atlantic Geology, 44, 1–52. All rights reserved © Atlantic Geology, 2008 This document is protected by copyright law. Use of the services of Érudit (including reproduction) is subject to its terms and conditions, which can be viewed online. https://apropos.erudit.org/en/users/policy-on-use/ This article is disseminated and preserved by Érudit. Érudit is a non-profit inter-university consortium of the Université de Montréal, Université Laval, and the Université du Québec à Montréal. Its mission is to promote and disseminate research. https://www.erudit.org/en/ Atlantic Geoscience Society ABSTRACTS 2008 Colloquium & Annual General Meeting DARTMOUTH, NOVA SCOTIA The 2008 Colloquium and Annual General Meeting were held at the Holiday Inn Harbourside, Dartmouth, Nova Scotia, on February 1 and 2, 2008. On behalf of the society, we thank Colloquium Chairs Michael Parsons and Jennifer Bates and their organizing committee (Sonya Dehler, Grant Ferguson, Martin Gibling, John Gosse, Elisabeth Kosters, Nelly Koziel, Mike MacDonald, David Mosher, Rob Naylor, Georgia Pe- Piper, Lawrence Plug, Anne-Marie Ryan, John Shimeld, Deb Skilliter, Ian Spooner, Charlie Walls, Chris White, Graham Williams, and Reg Wilson) for providing an excellent meeting. We also wish to acknowl- edge support of the corporate sponsors: Nova Scotia Department of Energy; Canadian Space Agency; Potash Corporation of Saskatchewan; Natural Resources Canada; Nova Scotia Department of Natural Resources; Corridor Resources Incorporated; Geological Association of Canada; Mining Association of Nova Scotia; New Brunswick Department of Natural Resources - Geological Surveys; and Natural Sciences and Engineering Research Council of Canada. In the following pages, we are pleased to publish the abstracts of oral and poster presentations from the Colloquium, which focused on the following themes: Soil Geochemistry: Influences of Genetic and Environmental Factors; Mineral Deposits Research; Dendrochronology; Climate Change; Sediment Dynamics, Oceanography and Ecology of the Greater Bay of Fundy, Scenarios Resulting from Tidal Power Development; Geochronology: Timing, Timescales, and Tempo of Crustal Processes; Earth-based Studies of Planetary Surfaces; Education in the International Year of Planet Earth; and Current Research in the Atlantic Provinces. THE EDITORS Atlantic Geology 44, 1–52 (2008) Copyright © Atlantic Geology, 2007 0843-5561|08|01001–52$8.80|o atlantic geology . volume 44 . 2008 2 A Raman and X-ray absorption spectroscopic investigation Landscape evolution studies depend critically on the of the structure and speciation of aqueous zinc bromide quantification of long-term denudation rates. These are dif- solutions at hydrothermal conditions ficult to obtain in active mountain belts, because sediments are normally rapidly eroded in these environments. Terrestrial Alan J. Anderson1, William A. Bassett2, I-Ming in situ cosmogenic nuclides (10Be and 36Cl) have been used in Chou3, Robert A. Mayanovic4, and Kenji Mibe5 this study in different ways to estimate denudation rates in 1. Department of Earth Sciences, St. Francis Xavier University, P.O. the southern Central Andes of Chile. An inventory of large Box 5000, Antigonish, NS, Canada B2G 2W5 <[email protected]> bedrock involved landslides, with a chronology supported by ¶ 2. Department of Earth and Atmospheric Sciences, Cornell 10Be and 36Cl exposure dating provides reconstructed sediment University, Ithaca, NY, 14853-1504 USA ¶ 3. MS 954, U.S. Geological volumes to estimate denudation rates from landslides during Survey, Reston, VA, 20192 USA ¶ 4. Department of Physics, the Pleistocene. Simultaneously, 36Cl basin-wide average ero- Astronomy and Materials Science, Missouri State University, sion rates were obtained for small catchments inside the same Springfield, MO, 65897, USA ¶ 5. Earthquake Research Institute, area. Both long-term (103–106 a) estimates were compared to University of Tokyo, Tokyo 113-0032, Japan short-term estimates based on suspended sediment records for the last 30 years. A Raman spectral study was carried out on three aqueous Rates of denudation of ~0.1 mm/a were obtained using the solutions of varying concentration and bromide/zinc ratio. landslide inventory data, similar to the 36Cl basin-wide aver- Spectra were collected at 11 different temperature-pressure age erosion rates (0.15–0.23 mm/a). The estimations from conditions ranging from ambient to 500°C and up to 0.9 GPa. suspended sediment records for the last 30 years show variable Raman band assignments for aqueous zinc bromide complex values, depending on their position along the orogen, between species reported in previous studies were used to determine the 0.03 to 0.15 mm/a. As accumulation inside the range is minor, 2– – + relative concentrations of ZnBr 4 , ZnBr 3 , ZnBr2, and ZnBr there are two possibilities that can explain these observations, species at various temperatures and pressures. Our results setting aside scale differences for the studied areas. Although are in close agreement with X-ray absorption spectroscopic for one area all estimates are similar within uncertainty, for (XAS) data, and confirm that the tetrabromo zinc complex, others present day sediment transport by large rivers is out 2– ZnBr 4 , is the predominant species up to 500°C in solutions of equilibrium with long-term transport. The system might having high zinc concentrations (1 m) and high bromide/zinc be currently transport-limited but during the Pleistocene it molar ratios ([Br]/[Zn] = 8). This result is consistent with the must have had periods of increased sediment discharge. A 2– observed predominance of the ZnCl4 , complex in chloride- second alternative is that the bedload component of sedi- rich fluid inclusion brines at high temperatures. In agreement ment transport needs to be incorporated more precisely into with previous solubility and Raman spectroscopic experi- the estimations from suspended sediment records. Application ments, our measurements also indicate that species with a of three bedload transport theoretical formulations to major lower number of halide ligands and charge are favored with rivers of the region supports this asseveration, suggesting that increasing temperature in dilute solutions, and solutions with in this environment bedload can represent up to 80% of the low bromine/zinc ratios ([Br]/[Zn] < 2.5). Raman and X-ray sediment transport. absorption spectroscopy are complementary techniques that were used in this study to obtain speciation and structural data on aqueous zinc bromide solutions at elevated temperatures The future for geology –3D interactive data: and pressures. Furthermore, we show that Raman spectros- an example from the Sussex area of the copy, in some cases, may be used to independently evaluate Moncton sub-basin, New Brunswick, Canada XAS data obtained from high temperature disordered systems such as supercritical fluids. Janelle Appleyard1, Terry Danyluk1, Balazs Nemeth1, Arnfinn Prugger1, Brian Roulston2, and Chrissy Williston3 Pleistocene landscape evolution of the 1. PotashCorp, Technical Services, Earth Science and Mining, 500 southern Central Andes quantified with – 122 First Av. S., Saskatoon, SK, S7N-0T1 Canada <arnfinn. cosmogenic nuclide techniques [email protected]> ¶ 2. PotashCorp, New Brunswick Division, P. O. Box 5039, Sussex, NB, E4E 5L2 Canada ¶ 3. Mira Jose Luis Antinao1, John Gosse1, Marc Caffee2, Geoscience, 320 Victoria Av., Montreal, QC, E4E 5L2 Canada and Robert Finkel3 1. Department of Earth Sciences, Dalhousie University, Halifax, NS The fault-bound Moncton sub-basin in southern New B3H 4J1 Canada <[email protected]> <[email protected]> Brunswick is part of the larger Maritimes Basin which extends ¶ 2. Physics Department, Purdue University, West Lafayette, throughout much of eastern Canada. It is within this sub-basin IN 47097, USA ¶ 3. Center of Accelerator Mass Spectrometry, that the potash deposit mined at Penobsquis occurs. In 2001 Lawrence Livermore National Lab, Lawrence, CA, 94550 USA a new potash discovery was made in the Picadilly region just Abstracts – AGS 2008 Colloquium & Annual General Meeting Copyright © Atlantic Geology, 2008 atlantic geology . volume 44 . 2008 3 south of the Penobsquis mine. This discovery initiated a pot- age of ca. 531 Ma from an ash horizon, previously published ash exploration program that involved drilling, 2D seismic, by Isachsen and others. As originally defined, the overlying 3D seismic, airborne EM, and analysis of existing gravity data. Glen Falls Formation consisted of grey to white quartz arenite These data were analysed and integrated to create a spatially and overlying black phosphatic and glauconitic quartz aren- accurate regional model of all formations in the Sussex area of ite. Based on paleontological evidence, only the white quartz the Moncton sub-basin. This regional geological information arenite is considered to be equivalent to the lithologically is considered important for understanding the processes that similar Random Formation of eastern
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