Topic
Pelagic red clay
About: Pelagic red clay is a research topic. Over the lifetime, 18 publications have been published within this topic receiving 791 citations. The topic is also known as: red clay & brown clay.
Papers
TL;DR: In this paper, the melting behavior of wet red clay is similar to that for wet gabbro, but melting occurs at a slightly lower temperature, showing that sediment melting and Gabbro dehydration can occur at the same temperature, and the combination of trace-element data and phase diagrams such as that derived here may be used to constrain the temperature of the slab-mantle boundary.
Abstract: The fate of pelagic sediments in subduction zones has an important bearing on global geochemical cycles and the thermal structure of subduction zones. Recent mass-balance calculations have indicated that about 20% of subducted sediments are recycled to volcanic arcs. Trace-element studies of these volcanic arcs imply that the subducted sediment melts while the gabbroic crust that underlies it dehydrates. This requires a rather specific thermal structure in subduction zones. Here we report laboratory melting experiments that allow us to derive melting curves for pelagic red clay at pressures of up to 40 kbar, equivalent to depths of 120 km within the mantle. The melting behaviour of wet red clay is similar to that for wet gabbro, but melting occurs at a slightly lower temperature, showing that sediment melting and gabbro dehydration can occur at the same temperature. The combination of trace-element data and phase diagrams such as that derived here may thus be used to constrain the temperature of the slab–mantle boundary.
261 citations
TL;DR: In this paper, the chemical compositions of 140 deep-sea sediment samples collected in the Pacific were examined and the characteristic features of the abundances of REEs in the sediment samples, including pelagic red clay, calcareous ooze, and blue mud, were demonstrated especially by a variety of Ce anomalies in the shale-normalized REE pattern.
201 citations
TL;DR: Measurements in the interstitial waters of pelagic red clay and carbonate ooze sediments in the central equatorial Pacific show that the dissolved oxygen content decreases with depth and levels off at nonzero values.
Abstract: Measurements in the interstitial waters of pelagic red clay and carbonate ooze sediments in the central equatorial Pacific show that the dissolved oxygen content decreases with depth and levels off at nonzero values. The supply of reactive organic carbon introduced by bioturbation limits oxygen consumption at depth in the sediment. These gradients should produce diffusive fluxes across the sediment-water interface that average about 8.8 x 10(-14) mole per square centimeter per second or 0.08 milliliter per square meter per hour.
81 citations
TL;DR: In this article, the authors studied the sorption of iodide, iodate, and periodate ions by kaolinite, hematite and pelagic red clay in buffer solutions and sea water.
77 citations
TL;DR: In this article, the authors established threshold erosion velocities for plane beds of pelagic red clay by ten experimental runs in a recirculating saltwater flume and showed that even with water content as high as 82%, observable erosion of the sediment required a velocity equivalent to a bottom current of about 30 cm/sec.
77 citations
Related Topics (5)
Performance Metrics
| Year | Papers |
|---|---|
| 2018 | 1 |
| 2017 | 1 |
| 2011 | 2 |
| 2008 | 2 |
| 2003 | 1 |
| 1996 | 1 |