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Taylor and Francis Group, GFF, 3-4(135), p. 316-339

DOI: 10.1080/11035897.2013.833430

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New insight into Saanich Inlet varved sediments (British Columbia, Canada) from micro-scale analysis of sedimentary facies and micro-XRF core scanning analyses

Journal article published in 2013 by Kinuyo Kanamaru, Pierre Francus ORCID, Roger François, Mark R. Besonen, Carlo Laj
This paper was not found in any repository, but could be made available legally by the author.
This paper was not found in any repository, but could be made available legally by the author.

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Abstract

The late Pleistocene and Holocene laminated marine sediments deposited in Saanich Inlet, British Columbia, contain a well-known annually resolved record of environmental change. In this paper, these sediments were analyzed for the first time with an Itrax micro-X-ray fluorescence core scanner with a resolution of 100 ?m. These analyses were complemented by image analysis of backscattered scanning electron images, coupled with energy dispersive spectrometry analysis using a scanning electron microscope. Using this new information, nine sedimentary facies were identified based on distinct geochemical, sedimentological and morphological characteristics at both the macro and the microscopic scale:Facies 1: massive deposit during Termination 1 (T1),Facies 2: T1 varved sediment,Facies 3: early Holocene varved sediment,Facies 4: volcanic ash-rich sediment,Facies 5: mid-Holocene varved sediment,Facies 6: disturbed sediment,Facies 7: massive sediment,Facies 8: clay-rich layer,Facies 9: fecal pellet-rich sediment.We determined how these analyses reinforced or refined previous interpretations about the sedimentary processes responsible for their deposition, their sedimentary environments and/or their provenance with seasonal to sub-seasonal resolution. Each lithofacies has distinctive chemical and sedimentological signatures, which can be used to establish sediment provenance with seasonal to sub-seasonal resolution, and to help understand paleoclimatic variations.