Past Research
Here is a publication listing for 2015-2021, followed by a brief explanation of each article. Work has been collaborative mostly with graduate (MSc, PhD) students (shown in italics and bold) and two senior (BSc Honours) undergraduate students, their names shown in bold.
Regional geology, Ottawa-Bonnechere graben, central Canada
Dix GR, Davis DW, Chadirji-Martinez K, Marshall DD, Kendrick J, Yakymchuk C, and Sutcliffe CN (2021) Hydrochemical impact of a mantle plume recorded by petrology, geochemistry, and U–Pb geochronology of a calcite vein within the Ottawa-Bonnechere graben, Ontario, Canada. Chemical Geology v. 586, https://doi.org/10.1016/j.chemgeo.2021.120582
The impetus for this article was generated through research related to a BSc Honours thesis (Chadirji-Martinez, 2015) that found unexpected strongly depleted C13 signatures in calcite. What emerged is a ~200 million year (post-Paleozoic) record of regional uplift and groundwater movement influenced by the passage of the Great Meteor Hotspot in eastern Ontario. This record is based on interpreting changes in fluid chemistry and carbon pathways associated with a single vein near Ottawa, ON.
Ordovician foreland-interior depositional systems, Ontario
Kang H and Dix GR (2021) Upper Ordovician (Sandbian) carbonate outliers in the northern Ottawa-Bonnechere graben (central Canada): a record of Turinian and Chatfieldian transgressions and cross-platform sedimentation patterns. Canadian Journal of Earth Sciences v. 58(1), 1-20. https://doi.org/10.1139/cjes-2020-0065
Documentation of small area Ordovician outliers in the northern Ottawa Valley showing a regional coherent stratigraphy in response to regional transgression across a terrestrial landscape
Middle to Upper Ordovician foreland basin, eastern Ontario
Oruche NE and Dix GR (2019) Sequence stratigraphy of a Middle to Upper Ordovician foreland basin succession, Ottawa Embayment: significance for regional correlation across southern Laurentia. Basin Research v. 33 (1), 779-808. https://doi.org/10.1111/bre.12495
Pulling together a regional story of differential sedimentation linked to differential tectonism for the foreland basin succession of eastern Ontario, southern Quebec, and northern New York State
Oruche NE, Dix GR, and Gazdewich S (2019) δ13C stratigraphy of a Turinian-Chatfieldian (Upper Ordovician) foreland succession, Ottawa Embayment (central Canada): resolving local and inter-regional isotope excursions in a tectonically active basin. Palaeogeography, Palaeoceanography, Palaeoecology 528: 186-203. https://doi.org/10.1016/j.palaeo.2019.05.013
Illustrates changing C13 composition according to sedimentation patterns and paleoceanographic controls within the foreland basin
Oruche NE, Dix GR, and Kamo S, Lithostratigraphy of the upper Turinian – lower Chatfieldian (Upper Ordovician) foreland succession, and a U–Pb ID–TIMS date for the Millbrig volcanic ash bed in the Ottawa Embayment. Canadian Journal of Earth Sciences. 55: 1079-1102. https://doi.org/10.1139/cjes-2018-0006
Stratigraphic revision of part of the Upper Ordovician foreland succession and reporting the most precise (but superceded 2 years later) age date of the regional Millbrig Bentonite
Foreland deposits and a tectonic cycle, eastern Canada
Dix GR and Burden E (2018) Platform drowning leading to cool-water carbonate deposition: evolution of a Late Ordovician (Turinian–Chatfieldian) mixed-sediment platform within the Taconic orogen (Long Point Group, Newfoundland Appalachians). Canadian Journal of Earth Sciences. 55(9): 1036-1062. https://doi.org/10.1139/cjes-2018-0020
A mixed siliciclastic-carbonate system forming part of a transgressive-regressive depositional cycle influenced by tectonics
An archeological contribution . .
Dillehay TD, Ocampo C, Saavedra J, Sawakuchi AO, Vega RM, Pino M, Collins MB, Scott Cummings L, Arregui I., Villagran XS, Hartman G, Mella M, González A, and Dix G. (2015) New Archaeological Evidence for an Early Human Presence at Monte Verde, Chile. PLOS One, https://doi.org/10.1371/journal.pone.0141923
Providing SEM data related to limestone fragments found at the Monte Verde site.