NDLI: Taking varves to bits: Scanning electron microscopy in the study of laminated sediments and varves

Content Provider	Springer Nature Link
Author	Dean, Jean M. Kemp, Alan E.S. Bull, David Pike, Jennifer Patterson, Gunilla Zolitschka, Bernd
Copyright Year	1999
Abstract	Conventional high resolution studies of varved sediments are able to identify clastic and biogenic laminae, but are often unable to resolve the nature of fine-scale lamination contained therein. This intra-annual signal provides us with the highest potential resolution from the sedimentary record and can be resolved using scanning electron microscopy (SEM). Six case studies from lacustrine and marine settings are presented to illustrate the combination of clastic and biogenic fabric types typically found in laminated sediments. Clastic laminae fabrics include those which originate through grain settling and those which are ‘event deposits’. The correct identification of event deposits is essential if varves are to be used chronologically. SEM-based biogenic laminae fabric studies have identified seasonal faunal successions where individual laminae may be less than 100 μ thick and most recently, deep chlorophyll maxima (DCM) summer diatom floras, providing an insight into seasonal scale processes. High resolution lamina fabric studies can provide a basis for generating records of seasonal and inter-annual variability, thus contributing to our understanding of lacustrine and marine processes and palaeoenvironmental interpretation.
Starting Page	121
Ending Page	136
Page Count	16
File Format	PDF
ISSN	09212728
Journal	Journal of Paleolimnology
Volume Number	22
Issue Number	2
e-ISSN	15730417
Language	English
Publisher	Kluwer Academic Publishers
Publisher Date	1999-01-01
Publisher Place	Dordrecht
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Sedimentology Physical Geography Hydrobiology Environment Climate Change
Content Type	Text
Resource Type	Article
Subject	Earth-Surface Processes Aquatic Science

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