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Supplementary geochemical studies were made on samples from Sites 248 and 249 in the southwestern Indian Ocean. Three groups of chemical analyses were carried out in the following order: (1) analysis of interstitial waters (Na, K, Mg, Ca, Cl, SO4); (2) analysis of carbonate fractions (Ca, Sr, Mg, Fe, Mn); and (3) analysis of the insoluble residue after extraction of the carbonate (Si, Ti, Fe, Mn, Cu, Zn, Mg, Ca, Ni, Co, Mo, V, B, Cr). In addition to the chemical analyses, quartz, lussatite, and opaline were determined by X-ray diffraction. There are relationships between changes in sediment and interstitial water chemistries relative to depth. The original nature of the sediment seems to be the most important factor influencing its chemistry. Some chemical changes can occur during the diagenesis of carbonates, such as Mg enrichment and Sr depletion. The Eh conditions and their changes can influence the chemistry of the sediments by the formation of sulfides or the mobilization of Mn. Changes in the chemistry of interstitial waters are mostly related to diagenetic changes within the sediment such as the formation of dolomite, palygorskite, and clinoptilolite, and possible absorption of Sr in clay mineral lattices.

Geochemical Studies of Sediment and Interstitial Water, Sites 248 and 249, Leg 25, Deep Sea Drilling Project