Showing papers by "David Kadko published in 1987"
TL;DR: In this paper, Pore water and solid phase 226Ra profiles measured in cores from two sites in this area were modeled by adjusting the Ra adsorption coefficient as a function of the depth-varying Mn content.
44 citations
TL;DR: In this article, a hydrothermal plume was detected at the East Pacific Rise (EPR) near 8°45′N and at MANOP Site M, 25 km east of the EPR, by anomalous222Rn and Mn concentrations.
37 citations
01 Aug 1987
TL;DR: The first water column survey of the axial valley of the Gorda Ridge, a slow-to medium-rate spreading center within 300 km of the coast of Oregon and California, found strong evidence for ongoing hydrothermal venting as discussed by the authors.
Abstract: The first water-column survey of the axial valley of the Gorda Ridge, a slow- to medium-rate spreading center within 300 km of the coast of Oregon and California, found strong evidence for ongoing hydrothermal venting. At the northern end of the ridge, anomalously high concentrations of helium-3, dissolved manganese, particulate iron, and methane confirmed the hydrothermal origin of the above-bottom plumes identifiable as maxima in light-attenuation profiles. The presence of excess radon-222 and the highly soluble hydrothermal precipitate anhydrite in the plumes require a local vent source; the precipitation of anhydrite requires fluid temperatures of at least 130°C. Indications of hydrothermal activity elsewhere in the axial valley were inconclusive.
34 citations
01 Jan 1987
16 citations