ABSTRACT
We analyze the density distribution of marine sediments using density samples taken from 716 drill sites of the Deep Sea Drilling Project (DSDP). The samples taken within the upper stratigraphic layer exhibit a prevailing trend of the decreasing density with the increasing ocean depth (at a rate of -0.05 g/cm(3) per 1 km). Our results confirm findings of published studies that the density nonlinearly increases with the increasing sediment depth due to compaction. We further establish a 3D density model of marine sediments and propose theoretical models of the ocean-sediment and sediment-bedrock density contrasts. The sediment density-depth equation approximates density samples with an average uncertainty of about 10% and better represents the density distribution especially at deeper sections of basin sediments than a uniform density model. The analysis of DSDP density data also reveals that the average density of marine sediments is 1.70 g/cm(3) and the average density of the ocean bedrock is 2.9 g/cm(3).
Subject(s)
Geologic Sediments/chemistry , Seawater , Models, Theoretical , UncertaintyABSTRACT
En 250 ninos, procedentes en su mayoria del departamento de Montevideo, y que concurren para su asistencia a la Policlinica de Enfermedades Parasitarias del Instituto de Higiene, se hallaron parasitados el 66,4% (con protozoarios, 44,4% y con helmintos, 56%). Se determino el porcentaje de cada parasito hallado, se analizo su distribucion etaria, y los casos de mono, bi y poliparasitismo. Se analizaron los principales motivos de consulta y la sintomatologia predominante en forma global y para cada parasitosis. Se analizo la procedencia de los casos en el departamento de Montevideo
