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18 lut 2021 · In addition, we present an updated value of the global annual pelagic biogenic silica production (255 Tmol Si yr−1) based on new data from 49 field studies and 18 model outputs, and we provide a first estimate of the global annual benthic biogenic silica production due to sponges (6 Tmol Si yr−1).
3 sty 2013 · For nearly 20 years, the marine silica budget compiled by Tréguer et al. (1995), with its exploration of reservoirs, processes, sources, and sinks in the silica cycle, has provided context and...
For nearly 20 years, the marine silica budget com-piled by Tr ́eguer et al. (1995), with its exploration of reservoirs, processes, sources, and sinks in the silica cycle, has provided context...
Weath-ering (dissolution) of silicate rocks and minerals at low or high temperatures generates silicic acid (H4SiO4 or Si(OH)4), so-called dissolved silica (herein abbreviated as DSi). Discharge of rivers and of submarine groundwater into the coastal ocean, hydrothermal inputs into deep.
For nearly 20 years, the marine silica budget compiled by Tréguer et al. (1995), with its exploration of reservoirs, processes, sources, and sinks in the silica cycle, has provided context and information fundamental to study of the silica cycle.
The following is a description of the systems, processes and transformations that control the global silica cycle, and the known constraints on the δ 30 Si (see Figure 1). Weathering. Weathering is a major process that fractionates Si isotopes in the critical zone.
1 sty 2005 · The chapter outlines some of the basics surrounding the chemistry of dissolved silica and the mineralogy of biological phases formed from silica. Silicon is the second most abundant element in the Earth's crust, 27% by weight, exceeded only by oxygen.
