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| Blanc, G; Boulegue, J; Gieskes, Jm. |
| We report here our findings on the chemistry of methane, manganese and chloride dissolved in the interstitial water of the Barbados accretionary complex. The decollement separating the subduction plate from the accretionary wedge is geochemically characterized by high methane and manganese and low chloride concentrations relative to buried seawater. Sandstone layers occurring below the decollement and the compressive structures recording some of the earliest effects of offscraping are also characterized by similar anomalies. A fluid with the same characteristics is also found six kilometres to the east of the deformation front within the oceanic plate. High manganese concentration and low chlorinity also occur in the pore water of the offscraped sediment... |
| Tipo: Text |
Palavras-chave: BARBADOS ACCRETIONARY COMPLEX; INTERSTITIAL WATER; CHEMICAL COMPOSITION; ADVECTION; DIAGENESIS. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00101/21262/18873.pdf |
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| Bodergat, Am; Rio, M; Andreani, Am. |
| Cyprideis torosa (Crustacea, Ostracoda), which is well known for its ability to live in a wide range of salinity and for the variability of its ornamentation, was sampled in the paralic environment. in the Camargue (France) and in the area of Santa-Pola (south-east Spain), in ambient waters whose salinity varies from 1 to 120 g/l. The collected valves. which are smooth, punctuated, reticulated or have nodes on their surface, were analyzed by means of spark-source mass spectrometry. We detected twenty-six chemical elements, and found a clear relationship between the chemical composition, the ornamentation of the valves and the environmental parameters. In the oligohaline environment, the carapaces are thick, reticulated or node-bearing ; they are enriched... |
| Tipo: Text |
Palavras-chave: OSTRACODS; ORNAMENTATION; PARALIC ENVIRONMENT; CHEMICAL COMPOSITION; POLLUTION. |
| Ano: 1991 |
URL: http://archimer.ifremer.fr/doc/00103/21378/18978.pdf |
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