Full Record

New Search | Similar Records

Author
Title Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses
URL
Publication Date
University/Publisher University of Western Ontario
Abstract The upper Gowganda Formation of the Huronian Supergroup contains glacially-induced, varve-like rhythmites composed of turbiditic micro-laminae that potentially preserve a detailed record of climatic conditions during the Paleoproterozoic Era. A sedimentological analysis of upper Gowganda Formation deposits enabled identification of eight lithofacies comprising a glaciogenic depositional environment: 1) diamictite, 2) contorted argillite, 3) interlaminated siltstone and sandstone, 4) interbedded siltstone and claystone, 5) sandstone, 6) siltstone, 7) interbedded coarse-grained and fine-grained siltstone, and 8) wavy argillite. Major, trace, and rare earth element analyses indicate that the rhythmites have undergone limited recycling and chemical alteration. Whole-rock δ18O values are consistent with an Archean gneiss provenance and support that chemical weathering and diagenesis were insignificant. Spectral analysis of four rhythmic couplet thickness records using the MTM Toolkit of Mann and Lees (1996) supports the hypothesis of annual deposition for the rhythmites.
Subjects/Keywords Paleoproterozoic; Huronian; glaciation; rhythmites; varves; micro-laminae; Geology
Language en
Country of Publication ca
Format application/pdf
Record ID oai:ir.lib.uwo.ca:etd-4660
Repository uwo
Date Retrieved
Date Indexed 2020-06-19

Sample Search Hits | Sample Images

…Figures Figure 2-1: Distribution of the Huronian Supergroup in Ontario, Canada. The Huronian Supergroup comprises the eastern section of the Southern Province, and is divided into three regions: the Bruce Mines/Elliot Lake area, the Espanola/Whitefish…

…12 Figure 2-2: Generalized stratigraphic section of the Huronian Supergroup. Conglomerate is shown in grey, argillite/claystone in brown, sandstone in yellow and limestone in blue. Orange at the base of the section indicates volcanic rocks. Note the…

…conditions at the time of deposition, particularly if they are formed in association with deglaciation. The rhythmite sequences in the Paleoproterozoic upper Gowganda Formation of the Huronian Supergroup, Canada have previously been identified as glacial…

…Setting 2.1 The Huronian Supergroup The Huronian Supergroup, which comprises the majority of the geological Southern Province, is a Paleoproterozoic, sedimentary-dominated succession that unconformably overlies Archean rocks of the Superior Province to…

…The Huronian Supergroup is up to 12 km thick at its southern boundary where it underlies Paleozoic rocks of the Michigan Basin (Young et al., 2001), and thins toward the north and west of the Southern Province. The southeastern boundary of…

…the Huronian Supergroup is characterized by the Grenville Front, which separates rocks of the Southern and Grenville Provinces. The Grenville Province contains the remnants of a mountain building event that terminated at ca. 1.0 Ga (Young and…

…the prefix “meta” to describe the rock types (e.g. meta-sandstone, meta-siltstone) is herein omitted for simplicity. The maximum age of the Huronian Supergroup is 2450 +25/-10 Ma, based on U-Pb zircon analysis of the Thessalon Formation (…

…Fig.2-2; Krogh et al., 1984). The minimum age of the Huronian Supergroup was determined to be 2217.0 6.0 Ma based on U-Pb analysis of primary baddeleyite from the Nipissing diabase dikes that intrude the succession (Corfu and Andrews, 1986…

.