Fossil clams from a serpentinite-hosted sedimented vent field near the active smoker complex Rainbow, MAR, 36 degrees 13 ' N: Insight into the biogeography of vent fauna
| Type | Article | ||||||||
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| Date | 2010-08 | ||||||||
| Language | English | ||||||||
| Author(s) | Lartaud Franck1, 2, de Rafelis Marc2, Oliver Graham3, Krylova Elena4, Dyment Jerome5, Ildefonse Benoit6, Thibaud Remy7, Gente Pascal8, 9, 10, Hoise Eva11, Meistertzheim Anne-Leila12, Fouquet Yves13, Gaill Francoise14, Le Bris Nadine1, 15 | ||||||||
| Affiliation(s) | 1 : Univ Paris 06, Lab Ecogeochim Environm Benth, CNRS, FRE 3350,Observ Oceanol, F-66650 Banyuls Sur Mer, France. 2 : Univ Paris 06, ISTeP, CNRS, Lab Biomineralisat & Environm Sedimentaires,UMR 7, F-75252 Paris 05, France. 3 : Natl Museum Wales, Dept Biodivers & Systemat Biol, Cardiff CF10 3NP, S Glam, Wales. 4 : PP Shirshov Inst Oceanol, Moscow 117997, Russia. 5 : Inst Phys Globe, F-75252 Paris, France. 6 : Univ Montpellier 2, CNRS, UMR 5243, CC60, F-34095 Montpellier 05, France. 7 : Naval Acad Res Inst, F-29240 Brest, France. 8 : Univ Europeenne Bretagne, F-29238 Brest 3, France. 9 : CNRS, UMR 6538, F-29280 Plouzane, France. 10 : Univ Brest, OSU IUEM, UMR 6538, F-29280 Plouzane, France. 11 : Ecole Normale Super, Geol Lab, UMR 8538, F-75231 Paris 05, France. 12 : UPVD, CNRS, UMR 5244, F-66860 Perpignan, France. 13 : IFREMER, Ctr Brest, Dept Marine Geosci, F-29280 Plouzane, France. 14 : UPMC, AMEX, CNRS, MNHN,IRD,UMR 7138, F-75252 Paris 05, France. 15 : IFREMER, Lab Environm Profond, Ctr Brest, F-20280 Plouzane, France. |
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| Source | Geochemistry Geophysics Geosystems (1525-2027) (Amer Geophysical Union), 2010-08 , Vol. 11 , N. Q0AE01 , P. 1-17 | ||||||||
| DOI | 10.1029/2010GC003079 | ||||||||
| WOS© Times Cited | 27 | ||||||||
| Keyword(s) | ultramafic-hosted, Mid-Atlantic Ridge, bivalve shells, Vesicomyidae, Thyasiridae, carbon and oxygen isotopes | ||||||||
| Abstract | Hydrothermal circulation at ultramafic-hosted sites supports a large variety of high-and low-temperature hydrothermal vents and associated ecosystems. The discovery of abundant fossil vesicomyid and thyasirid shell accumulations at the ridge crest, approximately 2.5 km east of the active Rainbow vent field on the Mid-Atlantic Ridge (MAR, 36 degrees 13'N), increased our knowledge regarding the diversity of vent communities at slow spreading ridges. Bivalve molluscs of the family Vesicomyidae were represented by the genus Phreagena. Here we present the first record of this genus in the Atlantic Ocean. This second vesicomyid species known from the MAR, Phreagena sp., was found to be associated with a Thyasira species that is affiliated with T. southwardae (at the Logatchev vent field on the MAR) and with T. vulcolutre (in the Gulf of Cadiz). These two clams have close relationships with seep taxa along the continental margin, and were likely associated with sedimented vent fields. delta O-18 and delta C-13 analyses of the shells suggested that the burrowing bivalve Thyasira could incorporate isotopically light carbon, derived from the oxidation of methane in the sediment, while the signature of Phreagena sp. shells denoted a different carbonate source. C-14 dating of the shells denoted that the hydrothermal activity in the Rainbow area began at least similar to 25.5 kyr BP, which is similar to the model of the hydrothermal vent field distribution that was proposed for the Logatchev hydrothermal site. The results provide new insight regarding the diversity of chemosynthetic fauna on the MAR over geologic time. Ultramafic-hosted, on-axis sedimented vent fields extend the range of habitats for chemosynthetic communities, underlying the need to further explore the geology of these types of environments on slow-spreading ridges and to determine their role in the ecology of deep-sea vent communities. | ||||||||
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