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| Registros recuperados: 82 | |
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| Rougerie, Francis; Fagerstrom, J.A.. |
| The mid-cretaceous histories (origin, growth, death) of algal-rudist-stromatoporoid reef communities located on many Pacific basin guyots are complex and controversial. These shallow water, tropical communities originated on volcanic edifices extruded during the Barremian-Albian, grew upward during edifice subsidence/trangression throughout the Aptian, Albian and Cenomanian and several of them died almost synchronously near the Cenomanian-Turonian boundary. During their periods of origin and growth, we postulate that the reef ecosystem received dissolved oxygen by wave surge and nutrients by geothermal endo-upwelling. By this process oceanic waters of intermediate depth (approx. 500-1500m) were : (a) drown into the weathered and fractured volcanic summit... |
| Tipo: Text |
Palavras-chave: RECIF CORALLIEN; CIRCULATION OCEANIQUE; GEOLOGIE MARINE; CRETACE; ENDO UPWELLING. |
| Ano: 1994 |
URL: http://www.documentation.ird.fr/hor/fdi:42900 |
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| Bard, E.; Hamelin, B.; Arnold, M.; Montaggioni, L.; Cabioch, Guy; Faure, G.; Rougerie, Francis. |
| The timing of the last deglaciation is important to our understanding of the dynamics of large ice sheets and their effects on the Earth's surface. Moreover, the disappearance of the glacial ice sheets was responsible for dramatic increases in freshwater fluxes to the oceans, which probably disturbed the ocean's thermohaline circulation and, hence, global climate. Sea-level increase bear witness to the melting of continental ice sheets, but only two such records - from Barbados and New Guinea corals - have been accurately dated. But these corals overlie active subduction zones, where tectonic movements are large and often discontinuous (especially in New Guinea), so the apparent sea-level records may be contamined by a complex tectonic component. Here we... |
| Tipo: Text |
Palavras-chave: QUATERNAIRE; RECIF CORALLIEN; NIVEAU MARIN; SEDIMENTOLOGIE; LITHOLOGIE; PALEOENVIRONNEMENT; PALEOCLIMAT. |
| Ano: 1996 |
URL: http://www.documentation.ird.fr/hor/fdi:010006546 |
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| Registros recuperados: 82 | |
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