Diagenesis in prehistoric caves: The use of minerals that form in situ to assess the completeness of the archaeological record

An interpretation of the archaeological record, in particular that of a pre historic cave site, is complicated by the diversity of depositional and pos t-depositional processes that affect the material deposited. Here we propos e to use the authigenic minerals that form in situ within the cave sediment s to reconstruct the ancient chemical environments in the sediments. This c an be done by experimentally determining the conditions under which each of the authigenic minerals are stable. Although this information is not avail able to date for minerals formed in a prehistoric cave, we present calculat ed stability field data for the relevant minerals. The results clearly demo nstrate the feasibility of this approach. This information, particularly if based on measurements of real authigenic cave minerals, will facilitate an assessment of the completeness of the cave archaeological record. This is particularly important for determining whether or not the distributions of archaeologically important materials, such as bones, teeth, plant phytolith s, charcoal and ash, reflect their original burial distributions or were al tered as a result of secondary diagenetic processes. Copyright 2000 Academi c Press