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Interstitial water studies on small core samples, Leg 22

February 1, 1974

Interstitial waters from Leg 22 in the Indian Ocean revealed two unique results: Site 214, on the Ninetyeast Ridge, penetrated through a 30-meter sequence of fine-grained basalt and reentered hard, silty clay containing carbonate skeletal debris. Such a basalt layer may well have been impervious and extensive enough to seal off underlying (fossil) seawater of Paleocene age. However, except for a marked increase in calcium and a slight increase in chloride, no appreciable changes in pore fluid chemistry could be confirmed. Site 217, at the northernmost end of the Ninetyeast Ridge, demonstrated record concentrations of interstitial calcium in clayey nannofossil oozes and a relatively small but significant increment in chloride with depth. Presumably, these increments signal the existence of evaporitic sediments or evaporite-influenced brines at considerably greater depth than penetrated.

Publication Year 1974
Title Interstitial water studies on small core samples, Leg 22
DOI 10.2973/dsdp.proc.22.131.1974
Authors Frank T. Manheim, Lee S. Waterman, Frederick L. Sayles
Publication Type Article
Publication Subtype Journal Article
Series Title Initial reports of the Deep Sea Drilling Project
Index ID 70121301
Record Source USGS Publications Warehouse
USGS Organization Coastal and Marine Geology Program; Woods Hole Coastal and Marine Science Center