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1. Howe, Timothy S. Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses.

Degree: 2015, University of Western Ontario

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

…43 Figure 3-8: A: Micro-laminae in claystone (clst) layers in the lower section… …layers of siltstone (slst) that separate individual lamina. Siltstone micro-laminae… …are separated by thin claystone layers. B: Micro-laminae in the fine-grained siltstone (… …separate individual fine-grained siltstone lamina. C, D: Micro-laminae in claystone layers in the… …Siltstone micro-laminae are separated by thin claystone or fine-grained siltstone layers… 

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APA (6th Edition):

Howe, T. S. (2015). Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses. (Thesis). University of Western Ontario. Retrieved from https://ir.lib.uwo.ca/etd/3264

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Chicago Manual of Style (16th Edition):

Howe, Timothy S. “Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses.” 2015. Thesis, University of Western Ontario. Accessed March 06, 2021. https://ir.lib.uwo.ca/etd/3264.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

MLA Handbook (7th Edition):

Howe, Timothy S. “Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses.” 2015. Web. 06 Mar 2021.

Vancouver:

Howe TS. Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses. [Internet] [Thesis]. University of Western Ontario; 2015. [cited 2021 Mar 06]. Available from: https://ir.lib.uwo.ca/etd/3264.

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

Council of Science Editors:

Howe TS. Investigating potential climatic cycles in glacially-influenced rhythmites of the upper Gowganda Formation using geochemical, sedimentological and spectral analyses. [Thesis]. University of Western Ontario; 2015. Available from: https://ir.lib.uwo.ca/etd/3264

Note: this citation may be lacking information needed for this citation format:
Not specified: Masters Thesis or Doctoral Dissertation

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