By Pierre Francus
This 7th quantity of the DPER sequence examines imaging strategies for sedimentologists, paleolimnologists, paleoceanographers and microscopists engaged on concerns regarding paleoenvironmental reconstruction. it's going to aid the researcher or graduate pupil to appreciate each step interested in the imaging approach, from photo acquisition to measurements. strategies are defined to make sure that the proper protocols and technique are chosen to resolve a selected factor, and to judge the validity of medical effects.
Case experiences illustrate the big variety of data that may be got from many different types of sediments (marine, lacustrine and aeolian) and forms of samples (cores, embedded blocks, microscopic slides) utilizing diverse areas of the electromagnetic spectrum (visible, UV, IR, X-ray). the amount presents entire protocols, instructions, and suggestions for using most economical snapshot research ideas, to facilitate intercomparisons of measurements.
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Additional resources for Image Analysis, Sediments and Paleoenvironments
Example text
94: 1–10. , Saarinen T. and Snowball I. 2002. Documentation of the physical properties of annually laminated (varved) sediments at a sub-annual to decadal resolution for environmental interpretation. Quat. Int. 88: 5–12. Vladár A. 1999. Time-lapse scanning electron microscopy for measurement of contamination rate and stage drift. Scanning 21: 191–196. 3. IMAGE CALIBRATION, FILTERING, AND PROCESSING ALEXANDRA J.
Protocols have been developed to consistently prepare core faces for acquisition for color analysis (see Nederbragt and Thurow (this volume)) and results from these studies have produced valuable paleoenvironmental proxy records (Hughen et al. 1996; Nederbragt et al. 2000; Nederbragt and Thurow 2001). Generally, clear core face images can be obtained by carefully scraping the surface, moving the cleaning edge across the sedimentary structures. In cases where the sediment is clay-rich, an electro-osmotic knife can be used to prevent smearing (Pike and Kemp 1996).
Additionally, evolving approaches for the automation of image acquisition will provide increasingly efficient methods to obtain data from long sedimentary sequences or with higher spatial resolution. IMAGE ACQUISITION 33 Acknowledgments The authors wish to thank the editors for their efforts that have improved the manuscript. Reviews by A. Nederbragt and A. Rochon significantly improved the presentation of the text. Ursula Brupbacher helped proof read the manuscript. References Axelsson V. 1983. The use of X-ray radiographic methods in studying sedimentary properties and rates of sediment accumulation.