Post-deposition changes

Freestone, I. C. (2001), Post depositional changes in archaeological ceramics and glasses, in Brothwell, D. R. and A. M. Pollard (eds.), Handbook of Archaeological Sciences, Wiley, New York, pp. 615-626. 

Hodson, R.E, Christian, R.R., and Maccubbin, A.E. (1983) Lignocellulose and lignin in the salt marsh grass Spartina altemiflora initial concentration and short-term, post-depositional changes in detrital matter. Mar. Biol. 81, 1-7. 

Garrels R. M. and MacKenzie F. T. (1974) Chemical history of the oceans deduced from post-depositional changes in sedimentary rocks. In Studies in Paleo-Oceanography, SEPM Special Publication 20 (ed. W. W. Hey). Society of Economic Paleontologists and Mineralogists, Tulsa, OK, vol. 20, pp. 193-204. 

The purpose of the present study is to measure and understand the isotopic composition of boron in purely marine cherts, thus expanding the database of 5"B in sediments and sedimentary rocks (see Fig. 1). For this we use a sequence of cherts from the Deep Sea Drilling Project (DSDP). This suite of samples offers the possibility to determine the post-deposition changes in 6"B that accompany silica transformations during diagenesis. These transformations pose strong limits on the use of B isotopes in marine cherts as a potential paleo-tracer. 

Szczucihski W (2012) The post-depositional changes of the onshore 2004 tsunami deposits on the Andaman Sea coast of Thailand. Nat Hazards 60 115-133... 

Post-deposition changes due to post-deposition treatments, exposure to the ambient, subsequent processing steps, in-storage changes, or in-service changes... 

Post-Deposition Changes that Can Improve Adhesion... 

Even Ca, the element we used to normalize all our other measures, may be subject to post-depositional alteration. Moreover, such alteration may vaiy depending on local environmental conditions. Such a factor may account for some of the overlap or blurring we see between regional elemental signatures in our prehistoric samples. Without knowing exactly how much change may have taken place in Ca concentrations in different burial conditions, it is difficult in such sourcing studies to account for this possibility. 

Diachronic Dealing with change over time, comparing two or more time periods. Diagenesis Post-depositional contamination of materials, chemical changes in artifacts. Diatom Silicate shells of microscopic algae. 

Analysis of metal artefacts tells us about their state of preservation, and analysis of any covering corrosion products informs us about the post-depositional corrosion processes and their thermodynamic stability. This in turn enables us to forecast the changes in the environment that may be detrimental to their future preservation. 

Abstract Scientific observations of our oceans and climate go back no more than a couple of hundred years. Most of our information about the evolution of Earth s ocean-climate system relies instead on proxies - primarily measurements of sediment components that respond to changes in environmental parameters. This paper provides an overview of some of the most important biological and geochemical proxies and outlines their contribution to our understanding of the ocean-climate system. We also discuss some of the challenges that need to be overcome to obtain accurate records. These include better understanding of the controls on the mechanisms of biomineralization the impacts of post-depositional dissolution and diagenesis on primary proxy relationships proxy validation and analytical considerations. 

---