The cyclicity is also well defined by porosity, density, and velocity. Firmgrounds are recognized by increased gamma ray, resistivity, and sonic velocity. A pattern of larger-scale cyclicity reflects changes in the abundance and spatial frequency of the cycles. These patterns may be related to depositional changes associated with current intensity and can be tentatively correlated with sequence boundaries. The mineralogy at this site is dominated by low-Mg calcite.
Dolomite is a minor but ubiquitous component throughout the core.
With the exception of the upper 30 mbsf, the sediment profiles are dominated by diffusion from an underlying brine with local reactions involving Ca, Mg, Sr, K, Li, F, and Si providing deviations from the ideal diffusive profiles. The Sr concentration increases steadily over this interval as a result of the dissolution of aragonite and the precipitation of calcite and dolomite. The Sr can attain this high concentration primarily because sulfate has been completely utilized in the oxidation of organic material. Concentrations of H 2 S are low at this site as a result of the abundance of iron which allows the formation of pyrite. In summary, Site 1006 has met and exceeded all its initial expectations.