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| Marques, Ana Filipa A.; Barriga, F; Chavagnac, V; Fouquet, Yves. |
| Petrological, geochemical, and Nd isotopic analyses have been carried out on rock samples from the Rainbow vent field to assess the evolution of the hydrothermal system. The Rainbow vent field is an ultramafic-hosted hydrothermal system located on the Mid-Atlantic Ridge characterized by vigorous high-temperature venting (similar to 365 degrees C) and unique chemical composition of fluids: high chlorinity, low pH and very high Fe, and rare earth element (REE) contents (Douville et al., Chemical Geology 184:37-48, 2002). Serpentinization has occurred under a low-temperature (< 270 degrees C) retrograde regime, later overprinted by a higher temperature sulfide mineralization event. Retrograde serpentinization reactions alone cannot reproduce the reported... |
| Tipo: Text |
Palavras-chave: Rainbow vent field; Mid Atlantic Ridge; Nd isotope; Serpentinite; Massive sulphide. |
| Ano: 2006 |
URL: http://archimer.ifremer.fr/doc/2006/publication-1557.pdf |
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| Pedziwiatr, Artur; Kierczak, Jakub; Waroszewski, Jaroslaw; Ratie, Gildas; Quantin, Cecile; Ponzevera, Emmanuel. |
| Background and aims Ultramafic soils constitute an extreme environment for plants because of specific physico-chemical properties and the presence of Ni, Cr, and Co. We hypothesized that type of ultramafic parent rock depending on their origin affects the composition of soils and plants. Therefore, phytoavailability of metals would be higher in soil derived from serpentinized peridotite compared to serpentinite because of differences in susceptibility of minerals to weathering. Results Based on DTPA-CaCl2 extractions, we noted that soil derived from the serpentinized peridotite is characterized by a higher phytoavailability of Ni compared to soil derived from the serpentinite. On the contrary, plant species growing on soil derived from the serpentinite... |
| Tipo: Text |
Palavras-chave: Peridotite; Serpentinite; Excluders; Ni isotopes; Ca/mg ratio. |
| Ano: 2018 |
URL: http://archimer.ifremer.fr/doc/00414/52537/53344.pdf |
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