Arturo Andrés Roig. Teoría y crítica del pensamiento latinoamericano. México, F.C.E., 1981, 315 p.

Fil: Licata, Rosa. Universidad Nacional de Cuyo. Facultad de Filosofía y Letras

Francisco Rodríguez Adrados. Historia de la lengua griega, Madrid, Gredos 1999, 315 pp.

Fil: González de Tobia, Ana María. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Francisco Rodríguez Adrados. Historia de la lengua griega, Madrid, Gredos 1999, 315 pp.

Fil: González de Tobia, Ana María. Universidad Nacional de La Plata. Facultad de Humanidades y Ciencias de la Educación; Argentina.

Chemical composition of bottom sediments and interstitial waters from DSDP Sites 252, 285, 315, 317, 336, and 386

Six Deep Sea Drilling Project (DSDP) Sites (252, 285, 315, 317, 336, 386) were examined for the chemical composition of the dissolved salts in interstitial waters, the oxygen isotopic composition of the interstitial waters, and the major ion composition of the bulk solid sediments. An examination of the concentration-depth profiles of dissolved calcium, magnesium, potassium, and H218O in conjunction with oxygen isotope mass balance calculations confirms the hypothesis that in DSDP pelagic drill sites concentration gradients in Ca. Mg. K, and H218O are largely due to alteration reactions occurring in the basalts of Layer 2 and to alteration reactions involving volcanic matter dispersed in the sediment column. Oxygen isotope mass balance calculations require substantial alteration of Layer 2 (up to 25% of the upper 1000 m). but only minor exchange of Ca, Mg, and K occurs with the overlying ocean. This implies that alteration reactions in Layer 2 are almost isochemical.